1617 lines
48 KiB
HTML
1617 lines
48 KiB
HTML
---
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layout: default
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title: Options - Select2
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slug: options
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---
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<div class="container">
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<section id="core">
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<div class="page-header">
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<h1>Core options</h1>
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</div>
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<p>
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Select2 supports a small subset of options in every build that is
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generated. Each option typically has a decorator that is required that
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wraps an adapter, adding support for the option. This is only required
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when a custom adapter is being used, as Select2 will build the required
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adapters by default.
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</p>
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<p>
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Select2 will automatically apply decorators to any adapters which have not
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been manually overridden. The only time you need to decorate adapters is
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when you are using third-party adapters not provided by Select2, or you
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are using features not provided in the Select2 core. You can apply a
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decorator to an adapter using the
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<code title="select2/utils">Utils.Decorate</code> method provided with
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Select2.
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</p>
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<pre class="prettyprint linenums">
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$.fn.select2.amd.require(
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["select2/utils", "select2/selection/single", "select2/selection/placeholder"],
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function (Utils, SingleSelection, Placeholder) {
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var CustomSelectionAdapter = Utils.Decorate(SingleSelection, Placeholder);
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});
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</pre>
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<p>
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All core options that use decorators or adapters will clearly state it
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in the "Decorator" or "Adapter" part of the documentation. Decorators are
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typically only compatible with a specific type of adapter, so make sure to
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note what adapter is given.
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</p>
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<h2 id="data-attributes">
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Declaring configuration in the <code>data-*</code> attributes
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</h2>
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<p>
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It is recommended that you declare your configuration options for Select2
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when initializing Select2. You can also define your configuration options
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by using the HTML5 <code>data-*</code> attributes, which will override
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any options set when initializing Select2 and any defaults.
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</p>
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<p>
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This means that if you declare your <code><select></code> tag as...
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</p>
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<pre class="prettyprint linenums">
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<select data-tags="true" data-placeholder="Select an option"></select>
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</pre>
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<p>
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Will be interpreted the same as initializing Select2 as...
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</p>
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<pre class="prettyprint linenums">
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$("select").select2({
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tags: "true",
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placeholder: "Select an option"
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});
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</pre>
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<p>
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You can also define nested configurations, which are typically needed for
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options such as AJAX. Each level of nesting should be separated by two
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dashes (<code>--</code>) instead of one. Due to
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<a href="https://github.com/jquery/jquery/issues/2070">a jQuery bug</a>,
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nested options using <code>data-*</code> attributes
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<a href="https://github.com/select2/select2/issues/2969">do not work in jQuery 1.x</a>.
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</p>
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<pre class="prettyprint linenums">
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<select data-ajax--url="http://example.org/api/test" data-ajax--cache="true"></select>
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</pre>
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<p>
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Which will be interpreted the same as initializing Select2 with...
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</p>
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<pre class="prettyprint linenums">
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$("select").select2({
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ajax: {
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url: "http://example.org/api/test",
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cache: "true"
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}
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});
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</pre>
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<p>
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The value of the option is subject to jQuery's
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<a href="https://api.jquery.com/data/#data-html5">parsing rules</a> for
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HTML5 data attributes.
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</p>
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<h2 id="amd">
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AMD compatibility
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</h2>
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<p>
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You can find more information on how to integrate Select2 with your
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existing AMD-based project by
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<a href="announcements-4.0.html#builds">viewing the 4.0 release notes</a>.
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Select2 automatically loads some modules when the adapters are being
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automatically constructed, so those who are using Select2 with a custom
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AMD build using their own system may need to specify the paths that are
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generated to the Select2 modules.
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</p>
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<div class="row">
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<div class="col-sm-6">
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd>
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<code>amdBase</code>
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</dd>
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<dt>Default</dt>
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<dd>
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<code>select2/</code>
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</dd>
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</dl>
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</div>
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<div class="col-sm-6">
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd>
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<code>amdLanguageBase</code>
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</dd>
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<dt>Default</dt>
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<dd>
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<code>select2/i18n/</code>
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</dd>
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</dl>
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</div>
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</div>
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<h2>
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Display
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</h2>
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<p>
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Select2 provides options that allow you to directly affect how the
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container that holds the current selection is displayed.
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</p>
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<h3 id="placeholder">
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Placeholders
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</h3>
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<p>
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Select2 can display a placeholder for a single-value select that will
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replace an option, or be shown when no options are selected for
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multiple-value selects. You can find an example on the
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<a href="examples.html#placeholders">example page</a>.
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</p>
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<div class="row">
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<div class="col-sm-4">
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd>
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<code>placeholder</code>
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</dd>
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<dt>Value</dt>
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<dd>string or object</dd>
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</dl>
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<hr />
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<dl class="dl-horizontal">
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<dt>Adapter</dt>
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<dd>
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<code title="select2/selection/base">SelectionAdapter</code>
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</dd>
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<dt>Decorator</dt>
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<dd>
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<code title="select2/selection/placeholder">Placeholder</code>
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and
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<code title="select2/dropdown/hidePlaceholder">HidePlaceholder</code>
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</dd>
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</dl>
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</div>
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<div class="col-sm-8">
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<div class="alert alert-warning">
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<strong>Heads up!</strong>
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Because browsers assume that the first <code>option</code> in
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single-value select boxes is selected, you should add an empty
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<code><option></option></code> tag that the placeholder
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should use or it may not work.
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</div>
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</div>
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</div>
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<p>
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If the <strong>value is a string</strong>, the placeholder will be
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displayed when a <strong>blank option</strong> is used as the placeholder.
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The <strong>value</strong> will be the message to show to users as the
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placeholders.
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</p>
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<pre class="prettyprint linenums">
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placeholder: "Select a repository",
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</pre>
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<p>
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If the <strong>value is an object</strong>, the object should be
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compatible with Select2's internal objects. The <code>id</code> should
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be the id to look for when determining if the placeholder should be
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displayed. The <code>text</code> should be the placeholder to display
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when that option is selected.
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</p>
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<pre class="prettyprint linenums">
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placeholder: {
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id: "-1",
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text: "Select a repository"
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}
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</pre>
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<div class="alert alert-info">
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You should <strong>pass in an object</strong> when you are using a
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framework that <strong>creates its own placeholder option</strong>. The
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<strong>id</strong> should be the same as the <code>value</code>
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attribute on the <code>option</code>.
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</div>
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<p id="allowClear">
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You can allow a selected option to be cleared back to the placeholder by
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enabling the <code>allowClear</code> option.
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</p>
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<div class="row">
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<div class="col-sm-6">
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd><code>allowClear</code></dd>
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<dt>Value</dt>
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<dd>boolean</dd>
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</dl>
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</div>
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<div class="col-sm-6">
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<dl class="dl-horizontal">
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<dt>Adapter</dt>
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<dd>
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<code title="select2/selection/base">SelectionAdapter</code>
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</dd>
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<dt>Decorator</dt>
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<dd>
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<code title="select2/selection/allowClear">AllowClear</code>
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</dd>
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</dl>
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</div>
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</div>
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<p>
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This will display an "x" that the user can click to clear the current
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selection. It is designed to be used for cases where a single selection
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can be made.
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</p>
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<h3 id="multiple">
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Multiple selections
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</h3>
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<p>
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Select2 can display either a single selection or multiple selections.
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</p>
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd><code>multiple</code></dd>
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<dt>Value</dt>
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<dd>boolean (<code>true</code> or <code>false</code>)</dd>
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</dl>
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<p>
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This option will determine what the <code>SelectAdapter</code> (used by
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default) should use to set the value of the underlying <code>select</code>
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element. It will also determine if the <code>MultipleSelection</code>
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adapter should be used.
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</p>
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<h3 id="width">
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Container width
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</h3>
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<p>
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Select2 will try to match the width of the original element as closely as
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possible. Sometimes this isn't perfect, which is what you can tell Select2
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how to determine the width.
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</p>
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<div class="row">
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<div class="col-sm-8">
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<table class="table table-striped table-bordered">
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<thead>
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<tr>
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<th>Value</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>"element"</code></td>
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<td>
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Uses javascript to calculate the width of the source element.
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</td>
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</tr>
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<tr>
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<td><code>"style"</code></td>
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<td>
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Copies the value of the width <code>style</code> attribute set on the source element.
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</td>
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</tr>
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<tr>
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<td><code>"resolve"</code></td>
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<td>
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Tries to use <code>style</code> to determine the width, falling back to <code>element</code>.
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</td>
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</tr>
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<tr>
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<td>Anything else</td>
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<td>
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The value of the <code>width</code> option is directly set as the width of the container.
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="col-sm-4">
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd><code>width</code></dd>
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<dt>Value</dt>
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<dd>string</dd>
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</dl>
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</div>
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</div>
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<h3 id="language">
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Internationalization (Language support)
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</h3>
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<p>
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Messages will be displayed to users when necessary, such as when no
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search results were found or more characters need to be entered in order
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for a search to be made. These messages have been
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<a href="community.html#translations">translated into many languages</a>
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by contributors to Select2, but you can also provide your own
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translations.
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</p>
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<div class="row">
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<div class="col-sm-4">
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd><code>language</code></dd>
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<dt>Value</dt>
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<dd>object or string</dd>
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</dl>
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<hr />
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<dl class="dl-horizontal">
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<dt>Module</dt>
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<dd>
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<code title="select2/translation">Translation</code>
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</dd>
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</dl>
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</div>
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<div class="col-sm-8">
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<p class="alert alert-warning">
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<strong>Heads up!</strong> When using translations provided by Select2,
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you must make sure to include the translation file in your page after
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Select2.
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</p>
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</div>
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</div>
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<p>
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When a string is passed in as the language, Select2 will try to resolve
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it into a language file. This allows you to specify your own language
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files, which must be defined as an AMD module. If the language file
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cannot be found, Select2 will assume it is a language code controlled by
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Select2, and it will try to load the translations for that language
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instead.
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</p>
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<p>
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You can include your own translations by providing an object similar to
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the one below.
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</p>
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<pre class="prettyprint linenums">
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language: {
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// You can find all of the options in the language files provided in the
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// build. They all must be functions that return the string that should be
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// displayed.
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inputTooShort: function () {
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return "You must enter more characters...";
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}
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}
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</pre>
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<h3 id="templating">
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Templating results and selections
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</h3>
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<p>
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By default, Select2 will display the option text within the list of
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results and when the option has been selected. Select2 comes with options
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that allow you to further customize the display of results and selections,
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allowing you to display them however you want.
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</p>
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<h4 id="templateSelection">
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Customizing the display of selections
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</h4>
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<p>
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When an option is displayed after it has been selected, it is passed
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through a formatting function that determines what is displayed. By
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default, the function only returns the <code>text</code> key of the data
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object.
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</p>
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd><code>templateSelection</code></dd>
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<dt>Value</dt>
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<dd>A function taking a <code>selection</code> object</dd>
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</dl>
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<div class="alert alert-info">
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<strong>Anything rendered as a selection is templated.</strong>
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This includes placeholders and pre-existing selections that are displayed,
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so you must ensure that your templating functions can support them.
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</div>
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<p>
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The <code>templateSelection</code> function should return a string
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containing the text to be displayed, or an object (such as a jQuery
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object) that contains the data that should be displayed.
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</p>
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<p>
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<strong>Strings are assumed to contain only text</strong> and will be
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passed through the <code>escapeMarkup</code> function, which strips any
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HTML markup.
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</p>
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<p>
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<strong>
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Anything else will be passed
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<a href="https://api.jquery.com/append/">directly to <code>jQuery.fn.append</code></a>
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</strong> and will be handled directly by jQuery. Any markup, such as
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HTML, returned will not be escaped and it is up to you to escape any
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malicious input provided by users.
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</p>
|
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<h4 id="templateResult">
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Customizing the display of results
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</h4>
|
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<p>
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When an option is displayed after it has been selected, it is passed
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through a formatting function that determines what is displayed. By
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default, the function only returns the <code>text</code> key of the data
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object.
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</p>
|
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<dl class="dl-horizontal">
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<dt>Key</dt>
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<dd><code>templateSelection</code></dd>
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|
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<dt>Value</dt>
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<dd>A function taking a <code>selection</code> object</dd>
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</dl>
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<div class="alert alert-info">
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<strong>Anything rendered in the results is templated.</strong>
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This includes results such as the "Searching..." and "Loading more..."
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text which will periodically be displayed, which allows you to add more
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advanced formatting to these automatically generated options.
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</div>
|
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|
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<p>
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The <code>templateResult</code> function should return a string
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containing the text to be displayed, or an object (such as a jQuery
|
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object) that contains the data that should be displayed. It can also
|
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return <code>null</code>, which will prevent the option from being
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displayed in the results list.
|
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</p>
|
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|
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<p>
|
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<strong>Strings are assumed to contain only text</strong> and will be
|
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passed through the <code>escapeMarkup</code> function, which strips any
|
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HTML markup.
|
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</p>
|
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|
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<p>
|
|
<strong>
|
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Anything else will be passed
|
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<a href="https://api.jquery.com/append/">directly to <code>jQuery.fn.append</code></a>
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</strong> and will be handled directly by jQuery. Any markup, such as
|
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HTML, returned will not be escaped and it is up to you to escape any
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malicious input provided by users.
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</p>
|
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|
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<h2>
|
|
Results
|
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</h2>
|
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|
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<p>
|
|
Select2 can work on many different data sets ranging from local options,
|
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the same way that a <code><select></code> typically works, from
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remote options where a server generates the results that users can select
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from.
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|
</p>
|
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|
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<h3 id="data">
|
|
Array
|
|
</h3>
|
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|
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<p>
|
|
Select2 allows creating the results based on an array of data objects that
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is included when initializing Select2.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd><code>data</code></dd>
|
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|
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<dt>Value</dt>
|
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<dd>array of objects</dd>
|
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</dl>
|
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</div>
|
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|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/data/array">ArrayAdapter</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<p>
|
|
The objects that the users can select from should be passed as an array
|
|
with each object containing <code>id</code> and <code>text</code>
|
|
properties.
|
|
</p>
|
|
|
|
<h3 id="ajax">
|
|
AJAX
|
|
</h3>
|
|
|
|
<p>
|
|
Select2 allows searching for results from remote data sources using AJAX
|
|
requests.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd><code>ajax</code></dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>object</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/data/ajax">AjaxAdapter</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<p>
|
|
All options passed to this option will be directly passed to the
|
|
<code>$.ajax</code> function that executes AJAX requests. There are a few
|
|
custom options that Select2 will intercept, allowing you to customize the
|
|
request as it is being made.
|
|
|
|
<pre class="prettyprint linenums">
|
|
ajax: {
|
|
// The number of milliseconds to wait for the user to stop typing before
|
|
// issuing the ajax request.
|
|
delay: 250,
|
|
// You can craft a custom url based on the parameters that are passed into the
|
|
// request. This is useful if you are using a framework which has
|
|
// JavaScript-based functions for generating the urls to make requests to.
|
|
//
|
|
// @param params The object containing the parameters used to generate the
|
|
// request.
|
|
// @returns The url that the request should be made to.
|
|
url: function (params) {
|
|
return UrlGenerator.Random();
|
|
},
|
|
// You can pass custom data into the request based on the parameters used to
|
|
// make the request. For `GET` requests, the default method, these are the
|
|
// query parameters that are appended to the url. For `POST` requests, this
|
|
// is the form data that will be passed into the request. For other requests,
|
|
// the data returned from here should be customized based on what jQuery and
|
|
// your server are expecting.
|
|
//
|
|
// @param params The object containing the parameters used to generate the
|
|
// request.
|
|
// @returns Data to be directly passed into the request.
|
|
data: function (params) {
|
|
var queryParameters = {
|
|
q: params.term
|
|
}
|
|
|
|
return queryParameters;
|
|
},
|
|
// You can modify the results that are returned from the server, allowing you
|
|
// to make last-minute changes to the data, or find the correct part of the
|
|
// response to pass to Select2. Keep in mind that results should be passed as
|
|
// an array of objects.
|
|
//
|
|
// @param data The data as it is returned directly by jQuery.
|
|
// @returns An object containing the results data as well as any required
|
|
// metadata that is used by plugins. The object should contain an array of
|
|
// data objects as the `results` key.
|
|
processResults: function (data) {
|
|
return {
|
|
results: data
|
|
};
|
|
},
|
|
// You can use a custom AJAX transport function if you do not want to use the
|
|
// default one provided by jQuery.
|
|
//
|
|
// @param params The object containing the parameters used to generate the
|
|
// request.
|
|
// @param success A callback function that takes `data`, the results from the
|
|
// request.
|
|
// @param failure A callback function that indicates that the request could
|
|
// not be completed.
|
|
// @returns An object that has an `abort` function that can be called to abort
|
|
// the request if needed.
|
|
transport: function (params, success, failure) {
|
|
var $request = $.ajax(params);
|
|
|
|
$request.then(success);
|
|
$request.fail(failure);
|
|
|
|
return $request;
|
|
}
|
|
}
|
|
</pre>
|
|
</p>
|
|
|
|
<h3 id="tags">
|
|
Tags
|
|
</h3>
|
|
|
|
<p>
|
|
Users can create their own options based on the text that they have
|
|
entered.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd><code>tags</code></dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>boolean / array of objects</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/data/base">DataAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/data/tags">Tags</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<p>
|
|
If the <code>tags</code> option is passed into Select2, if a user types
|
|
anything into the search box which doesn't already exist, it will be
|
|
displayed at the top and the user will be able to select it.
|
|
</p>
|
|
|
|
<p>
|
|
<strong>For backwards compatibility</strong>, if an array of objects is
|
|
passed in with the <code>tags</code> option, the options will be
|
|
automatically created and the user will be able to select from them.
|
|
This is the <strong>same as how <a href="#data">array data</a>
|
|
works</strong>, and has similar limitations.
|
|
</p>
|
|
|
|
<h3 id="matcher">
|
|
Change how options are matched when searching
|
|
</h3>
|
|
|
|
<p>
|
|
When users filter down the results by entering search terms into the
|
|
search box, Select2 uses an internal "matcher" to match search terms to
|
|
results. <strong>When a remote data set is used, Select2 expects that the
|
|
returned results have already been filtered.</strong>
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd>
|
|
<code>matcher</code>
|
|
</dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>
|
|
A function taking search <code>params</code> and the
|
|
<code>data</code> object.
|
|
</dd>
|
|
</dl>
|
|
|
|
<p>
|
|
Select2 will pass the individual data objects that have been passed back
|
|
from the data adapter into the <code>matcher</code> individually to
|
|
determine if they should be displayed. Only the first-level objects will
|
|
be passed in, so <strong>if you are working with nested data, you need to
|
|
match those individually</strong>.
|
|
</p>
|
|
|
|
<pre class="prettyprint linenums">
|
|
matcher: function (params, data) {
|
|
// If there are no search terms, return all of the data
|
|
if ($.trim(params.term) === '') {
|
|
return data;
|
|
}
|
|
|
|
// `params.term` should be the term that is used for searching
|
|
// `data.text` is the text that is displayed for the data object
|
|
if (data.text.indexOf(params.term) > -1) {
|
|
var modifiedData = $.extend({}, data, true);
|
|
modifiedData.text += ' (matched)';
|
|
|
|
// You can return modified objects from here
|
|
// This includes matching the `children` how you want in nested data sets
|
|
return modifiedData;
|
|
}
|
|
|
|
// Return `null` if the term should not be displayed
|
|
return null;
|
|
}
|
|
</pre>
|
|
|
|
<p>
|
|
This allows for more advanced matching when working with nested objects,
|
|
allowing you to handle them however you want. For those who are not
|
|
looking to implement highly customized matching, but instead are just
|
|
looking to change the matching algorithm for the text, a
|
|
<a href="#compat-matcher">compatibility modules</a> has been created to
|
|
make it easier.
|
|
</p>
|
|
</section>
|
|
|
|
<section id="dropdown">
|
|
<div class="page-header">
|
|
<h1>Dropdown</h1>
|
|
</div>
|
|
|
|
<p>
|
|
Select2 allows you to change the way that the dropdown works, allowing you
|
|
to do anything from attach it to a different location in the document or
|
|
add a search box.
|
|
</p>
|
|
|
|
<h2 id="dropdownParent">
|
|
Attached to body
|
|
</h2>
|
|
|
|
<p>
|
|
By default, Select2 will attach the dropdown to the end of the body and
|
|
will absolutely position it to appear below the selection container.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-4">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd><code>dropdownParent</code></dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>jQuery element or DOM node</dd>
|
|
|
|
<hr />
|
|
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/dropdown">DropdownAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/dropdown/attachBody">AttachBody</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-8">
|
|
<div class="alert alert-warning">
|
|
<strong>Heads up!</strong>
|
|
This will cause DOM events to be raised outside of the standard
|
|
Select2 DOM container. This can cause issues with
|
|
third-party components such as modals.
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<p>
|
|
When the dropdown is attached to the body, you are not limited to just
|
|
displaying the dropdown below the container. Select2 will display above
|
|
the container if there is not enough space below the container, but there
|
|
is enough space above it. You are also not limited to displaying the
|
|
dropdown within the parent container, which means Select2 will render
|
|
correctly inside of modals and other small containers.
|
|
</p>
|
|
|
|
<h2 id="dropdown-attachContainer">
|
|
Attached below the container
|
|
</h2>
|
|
|
|
<p>
|
|
Select2 can place the dropdown directly after the selection container, so
|
|
it will appear in the same location within the DOM as the rest of Select2.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-4">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/dropdown">DropdownAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/dropdown/attachContainer">AttachContainer</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-8">
|
|
<div class="alert alert-warning">
|
|
<strong>Check your build.</strong> This module is only included in the
|
|
<a href="index.html#builds-full" class="alert-link">full builds</a> of
|
|
Select2.
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="alert alert-info">
|
|
<strong>
|
|
<a href="https://harvesthq.github.io/chosen/">Harvest Chosen</a>
|
|
migrators!
|
|
</strong>
|
|
If you are migrating to Select2 from Chosen, this option will cause
|
|
Select2 to position the dropdown in a similar way.
|
|
</div>
|
|
|
|
<h2 id="dropdown-search">
|
|
Search
|
|
</h2>
|
|
|
|
<p>
|
|
Users can filter down the results by typing a search term into a box that
|
|
is displayed at the top of the dropdown.
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/dropdown">DropdownAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/dropdown/search">DropdownSearch</code>
|
|
</dd>
|
|
</dl>
|
|
|
|
<p>
|
|
A search box is added to the top of the dropdown automatically for select
|
|
boxes where only a single option can be selected.
|
|
</p>
|
|
|
|
<h3 id="dropdown-minimumInputLength">
|
|
Minimum search term length to filter results
|
|
</h3>
|
|
|
|
<p>
|
|
Sometimes when working with large data sets, it is more efficient to start
|
|
filtering the results when the search term is a certain length. This is
|
|
very common when working with remote data sets, as allows for only
|
|
significant search terms to be used.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd><code>minimumInputLength</code></dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>integer</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/data/base">DataAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/data/minimumInputLength">MinimumInputLength</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<h3 id="dropdown-maximumInputLength">
|
|
Maximum search term length to filter results
|
|
</h3>
|
|
|
|
<p>
|
|
In some cases, search terms need to be limited to a certain range. Select2
|
|
allows you to limit the length of the search term such that it does not
|
|
exceed a certain length.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd><code>maximumInputLength</code></dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>integer</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/data/base">DataAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/data/maximumInputLength">MaximumInputLength</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<h3 id="dropdown-maximumInputLength">
|
|
Minimum results to display the search box
|
|
</h3>
|
|
|
|
<p>
|
|
When working with smaller data sets, the search box can take up more space
|
|
that is necessary, as there are not enough results for filtering to be
|
|
effective. Select2 allows you to only display the search box when the
|
|
number of search results reaches a certain threshold.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd><code>minimumResultsForSearch</code></dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>integer</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/dropdown">DropdownAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/dropdown/minimumResultsForSearch">MinimumResultsForSearch</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<h2 id="dropdown-select-on-close">
|
|
Select the highlighted option on close
|
|
</h2>
|
|
|
|
<p>
|
|
When users close the dropdown, the last highlighted option can be
|
|
automatically selected. This is commonly used in combination with
|
|
<a href="#tags">tagging</a> and <a href="#placeholder">placeholders</a>
|
|
and other situations where the user is required to select an option, or
|
|
they need to be able to quickly select multiple options.
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/results">ResultsAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/dropdown/selectOnClose">SelectOnClose</code>
|
|
</dd>
|
|
</dl>
|
|
|
|
<h2 id="closeOnSelect">
|
|
Close the dropdown when a result is selected
|
|
</h2>
|
|
|
|
<p>
|
|
Select2 will automatically close the dropdown when an element is selected,
|
|
similar to what is done with a normal select box. This behavior can be
|
|
changed though to keep the dropdown open when results are selected,
|
|
allowing for multiple options to be selected quickly.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd><code>closeOnSelect</code></dd>
|
|
|
|
<dt>Default</dt>
|
|
<dd><code>true</code></dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/dropdown">DropdownAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/dropdown/closeOnSelect">CloseOnSelect</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<p>
|
|
If this decorator is not used (or <code>closeOnSelect</code> is set to
|
|
<code>false</code>), the dropdown will not automatically close when a
|
|
result is selected. The dropdown will also never close if the
|
|
<kbd>ctrl</kbd> key is held down when the result is selected.
|
|
</p>
|
|
</section>
|
|
|
|
<section id="events">
|
|
<div class="page-header">
|
|
<h1>Events</h1>
|
|
</div>
|
|
|
|
<p>
|
|
Select2 has an internal event system that is used to notify parts of the
|
|
component that state has changed, as well as an adapter that allows some
|
|
of these events to be relayed to the outside word.
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/selection">SelectionAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/selection/eventRelay">EventRelay</code>
|
|
</dd>
|
|
</dl>
|
|
|
|
<h2>
|
|
Public events
|
|
</h2>
|
|
|
|
<p>
|
|
All public events are relayed using the jQuery event system, and they are
|
|
triggered on the <code><select></code> element that Select2 is
|
|
attached to. You can attach to them using the
|
|
<a href="https://api.jquery.com/on/"><code>.on</code> method</a> provided
|
|
by jQuery.
|
|
</p>
|
|
|
|
<h2>
|
|
Internal events
|
|
</h2>
|
|
|
|
<p>
|
|
Select2 triggers internal events using its own internal event system,
|
|
which allows adapters to communicate with each other. These events are not
|
|
accessible through the jQuery event system.
|
|
</p>
|
|
|
|
<p>
|
|
You can find more information on the public events triggered by individual
|
|
adapters in <a href="#adapters">the individual adapter documentation</a>.
|
|
</p>
|
|
</section>
|
|
|
|
<section id="adapters">
|
|
<div class="page-header">
|
|
<h1>Adapters</h1>
|
|
</div>
|
|
|
|
<p>
|
|
Select2 allows plugins to add additional functionality through the core
|
|
adapters. You can change almost anything involving the way Select2 works
|
|
to the way Select2 interacts with the page by modifying the core adapters.
|
|
Most third-party plugins should provide decorators (used to wrap adapters)
|
|
and custom adapters that you can use.
|
|
</p>
|
|
|
|
<p>
|
|
Each adapter contains a set of methods which will must always be defined.
|
|
Along with the global methods that all adapters must implement, these
|
|
methods must be implemented.
|
|
</p>
|
|
|
|
<h2>
|
|
All adapters
|
|
</h2>
|
|
|
|
<p>
|
|
All adapters must implement a set of methods that Select2 will use to
|
|
display them and bind any internal events.
|
|
</p>
|
|
|
|
<pre class="prettyprint linenums">
|
|
// The basic HTML that should be rendered by Select2. A jQuery or DOM element
|
|
// should be returned, which will automatically be placed by Select2 within the
|
|
// DOM.
|
|
//
|
|
// @returns A jQuery or DOM element that contains any elements that must be
|
|
// rendered by Select2.
|
|
Adapter.render = function () {
|
|
return $jq;
|
|
};
|
|
|
|
// Bind to any Select2 or DOM events.
|
|
//
|
|
// @param container The Select2 object that is bound to the jQuery element. You
|
|
// can listen to Select2 events with `on` and trigger Select2 events using the
|
|
// `trigger` method.
|
|
// @param $container The jQuery DOM node that all default adapters will be
|
|
// rendered within.
|
|
Adapter.bind = function (container, $container) { };
|
|
|
|
// Position the DOM element within the Select2 DOM container, or in another
|
|
// place. This allows adapters to be located outside of the Select2 DOM,
|
|
// such as at the end of the document or in a specific place within the Select2
|
|
// DOM node.
|
|
//
|
|
// Note: This method is not called on data adapters.
|
|
//
|
|
// @param $rendered The rendered DOM element that was returned from the call to
|
|
// `render`. This may have been modified by Select2, but the root element
|
|
// will always be the same.
|
|
// @param $defaultContainer The default container that Select2 will typically
|
|
// place the rendered DOM element within. For most adapters, this is the
|
|
// Select2 DOM element.
|
|
Adapter.position = function ($rendered, $defaultContainer) { };
|
|
|
|
// Destroy any events or DOM elements that have been created.
|
|
// This is called when `select2("destroy")` is called on an element.
|
|
Adapter.destroy = function () { };
|
|
</pre>
|
|
|
|
<h2 id="selectionAdapter">
|
|
Container (selection)
|
|
</h2>
|
|
|
|
<p>
|
|
The selection is what is shown to the user as a replacement of the
|
|
standard <code><select></code> box. It controls the display of the
|
|
selection option(s), as well anything else that needs to be embedded
|
|
within the container, such as a search box.
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd>
|
|
<code>selectionAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Default</dt>
|
|
<dd>
|
|
<code title="select2/selection/single">SingleSelection</code> or
|
|
<code title="select2/selection/multiple">MultipleSelection</code>
|
|
</dd>
|
|
|
|
<dt>Base</dt>
|
|
<dd>
|
|
<code title="select2/selection/base">BaseSelection</code>
|
|
</dd>
|
|
</dl>
|
|
|
|
<pre class="prettyprint linenums">
|
|
// Update the selected data.
|
|
//
|
|
// @param data An array of data objects that have been generated by the data
|
|
// adapter. If no objects should be selected, an empty array will be passed.
|
|
//
|
|
// Note: An array will always be passed into this method, even if Select2 is
|
|
// attached to a source which only accepts a single selection.
|
|
SelectionAdapter.update = function (data) { };
|
|
</pre>
|
|
|
|
<h2 id="dataAdapter">
|
|
Data set
|
|
</h2>
|
|
|
|
<p>
|
|
The data set is what Select2 uses to generate the possible results that
|
|
can be selected, as well as the currently selected results.
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd>
|
|
<code>dataAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Default</dt>
|
|
<dd>
|
|
<code title="select2/data/select">SelectAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Base</dt>
|
|
<dd>
|
|
<code title="select2/data/base">BaseAdapter</code>
|
|
</dd>
|
|
</dl>
|
|
|
|
<pre class="prettyprint linenums">
|
|
// Get the currently selected options. This is called when trying to get the
|
|
// initial selection for Select2, as well as when Select2 needs to determine
|
|
// what options within the results are selected.
|
|
//
|
|
// @param callback A function that should be called when the current selection
|
|
// has been retrieved. The first parameter to the function should be an array
|
|
// of data objects.
|
|
DataAdapter.current = function (callback) {
|
|
callback(currentData);
|
|
}
|
|
|
|
// Get a set of options that are filtered based on the parameters that have
|
|
// been passed on in.
|
|
//
|
|
// @param params An object containing any number of parameters that the query
|
|
// could be affected by. Only the core parameters will be documented.
|
|
// @param params.term A user-supplied term. This is typically the value of the
|
|
// search box, if one exists, but can also be an empty string or null value.
|
|
// @param params.page The specific page that should be loaded. This is typically
|
|
// provided when working with remote data sets, which rely on pagination to
|
|
// determine what objects should be displayed.
|
|
// @param callback The function that should be called with the queried results.
|
|
DataAdapter.query = function (params, callback) {
|
|
callback(queryiedData);
|
|
}
|
|
</pre>
|
|
|
|
<h2 id="dropdownAdapter">
|
|
Dropdown
|
|
</h2>
|
|
|
|
<p>
|
|
The dropdown adapter defines the main container that the dropdown should
|
|
be held in. <strong>It does not define any extra methods that can be used
|
|
for decorators</strong>, but it is common for decorators to attach to the
|
|
<code>render</code> and <code>position</code> methods to alter how the
|
|
dropdown is altered and positioned.
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd>
|
|
<code>dropdownAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Default</dt>
|
|
<dd>
|
|
<code title="select2/dropdown">DropdownAdapter</code>
|
|
</dd>
|
|
</dl>
|
|
|
|
<h2 id="resultsAdapter">
|
|
Results
|
|
</h2>
|
|
|
|
<p>
|
|
The results adapter controls the list of results that the user can select
|
|
from. While the results adapter does not define any additional methods
|
|
that must be implemented, it makes extensive use of the Select2 event
|
|
system for controlling the display of results and messages.
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd>
|
|
<code>resultsAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Default</dt>
|
|
<dd>
|
|
<code title="select2/results">ResultsAdapter</code>
|
|
</dd>
|
|
</dl>
|
|
</section>
|
|
|
|
<section id="defaults">
|
|
<div class="page-header">
|
|
<h1>Setting default options</h1>
|
|
</div>
|
|
|
|
<p>
|
|
In some cases, you need to set the default options for all instances of
|
|
Select2 in your web application. This is especially useful when you are
|
|
migrating from past versions of Select2, or you are using non-standard
|
|
options <a href="#amd">like custom AMD builds</a>. Select2 exposes the
|
|
default options through <code>$.fn.select2.defaults</code>, which allows
|
|
you to set them globally.
|
|
</p>
|
|
|
|
<p>
|
|
When setting options globally, any past defaults that have been set will
|
|
be overriden. Default options are only used when an option is requested
|
|
that has not been set during initialization.
|
|
</p>
|
|
|
|
<p>
|
|
<strong>You can set default options</strong> by calling
|
|
<code>$.fn.select2.defaults.set("key", "value")</code>. The key that is
|
|
set should take the same format as keys set using
|
|
<a href="#data-attributes">HTML <code>data-*</code> attributes</a> which
|
|
means that two dashes (<code>--</code>) will be replaced by a level of
|
|
nesting, and a single dash (<code>-</code>) will convert it to a camelCase
|
|
string.
|
|
</p>
|
|
|
|
<pre class="prettyprint linenums">
|
|
$.fn.select2.defaults.set("theme", "classic");
|
|
</pre>
|
|
|
|
<p>
|
|
<strong>You can reset the default options</strong> by calling
|
|
<code>$.fn.select2.defaults.reset()</code>.
|
|
</p>
|
|
</section>
|
|
|
|
<section id="compatibility">
|
|
<div class="page-header">
|
|
<h1>Backwards compatibility</h1>
|
|
</div>
|
|
|
|
<p>
|
|
Select2 offers limited backwards compatibility with the previously 3.5.x
|
|
release line, allowing people more efficiently transfer across releases
|
|
and get the latest features. For many of the larger changes, such as the
|
|
change in how custom data adapters work, compatibility modules were
|
|
created that will be used to assist in the upgrade process. It is not
|
|
recommended to rely on these compatibility modules, as they will not
|
|
always exist, but they make upgrading easier for major changes.
|
|
</p>
|
|
|
|
<p>
|
|
<strong>The compatibility modules are only included in the
|
|
<a href="index.html#builds-full" class="alert-link">full builds</a> of
|
|
Select2</strong>. These files end in <code>.full.js</code>, and the
|
|
compatibility modules are prefixed with <code>select2/compat</code>.
|
|
</p>
|
|
|
|
<h2 id="compat-matcher">
|
|
Simplified function for matching data objects
|
|
</h2>
|
|
|
|
<p class="alert alert-info">
|
|
<a href="announcements-4.0.html#new-matcher" class="alert-link">Added in Select2 4.0.0.</a>
|
|
This method was added to make upgrading easier from earlier versions of
|
|
Select2.
|
|
</p>
|
|
|
|
<p>
|
|
During the <a href="announcements-4.0.html">Select2 4.0.0 release</a>, the
|
|
<code>matcher</code> function was changed to allow for more complex
|
|
matching of nested objects.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd>
|
|
<code>matcher</code>
|
|
</dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>
|
|
A function taking a search <code>term</code> and the data object
|
|
<code>text</code>.
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/compat/matcher">oldMatcher</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<p>
|
|
The <a href="examples.html#matcher">custom matcher example</a> provides a
|
|
guide for how to use this in your own application. For those upgrading
|
|
from older versions of Select2, you just need to wrap your old
|
|
<code>matcher</code> with this function to maintain compatibility.
|
|
</p>
|
|
|
|
<h2 id="initSelection">
|
|
Old initial selections with <code>initSelection</code>
|
|
</h2>
|
|
|
|
<p class="alert alert-warning">
|
|
<a href="announcements-4.0.html#removed-initselection" class="alert-link">Deprecated in Select2 4.0.</a>
|
|
This has been replaced by another option and is only available in the
|
|
<a href="index.html#builds-full" class="alert-link">full builds</a> of
|
|
Select2.
|
|
</p>
|
|
|
|
<p>
|
|
In the past, Select2 required an option called <code>initSelection</code>
|
|
that was defined whenever a custom data source was being used, allowing
|
|
for the initial selection for the component to be determined. This has
|
|
been replaced by the <code>current</code> method on the
|
|
<a href="#dataAdapter">data adapter</a>.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd>
|
|
<code>initSelection</code>
|
|
</dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>
|
|
A function taking a <code>callback</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/data/base">DataAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/compat/initSelection">InitSelection</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
|
|
<h2 id="query">
|
|
Querying old data with <code>query</code>
|
|
</h2>
|
|
|
|
<p class="alert alert-warning">
|
|
<a href="announcements-4.0.html#query-to-data-adapter" class="alert-link">Deprecated in Select2 4.0.</a>
|
|
This has been replaced by another option and is only available in the
|
|
<a href="index.html#builds-full" class="alert-link">full builds</a> of
|
|
Select2.
|
|
</p>
|
|
|
|
<p>
|
|
In the past, Select2 supported an option called <code>query</code> that
|
|
allowed for a custom data source to be used. This option has been replaced
|
|
by the <code>query</code> method on the
|
|
<a href="#dataAdapter">data adapter</a> and takes a very similar set of
|
|
parameters.
|
|
</p>
|
|
|
|
<div class="row">
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Key</dt>
|
|
<dd>
|
|
<code>query</code>
|
|
</dd>
|
|
|
|
<dt>Value</dt>
|
|
<dd>
|
|
A function taking <code>params</code> (including a <code>callback</code>)
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/data/base">DataAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/compat/query">Query</code>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
|
|
<h2 id="input-fallback">
|
|
Compatibility with <code><input type="text" /></code>
|
|
</h2>
|
|
|
|
<p class="alert alert-warning">
|
|
<a href="announcements-4.0.html#hidden-input" class="alert-link">Deprecated in Select2 4.0.</a>
|
|
It is now encouraged to use the <code><select></code> tag instead.
|
|
</p>
|
|
|
|
<p>
|
|
In past versions of Select2, a <code><select></code> element could
|
|
only be used with a limited subset of options. An
|
|
<code><input type="hidden" /></code> was required instead, which did
|
|
not allow for a graceful fallback for users who did not have JavaScript
|
|
enabled. Select2 now supports the <code><select></code> element for
|
|
all options, so it is no longer required to use <code><input /></code>
|
|
elements with Select2.
|
|
</p>
|
|
|
|
<dl class="dl-horizontal">
|
|
<dt>Adapter</dt>
|
|
<dd>
|
|
<code title="select2/data/base">DataAdapter</code>
|
|
</dd>
|
|
|
|
<dt>Decorator</dt>
|
|
<dd>
|
|
<code title="select2/compat/inputData">InputData</code>
|
|
</dd>
|
|
</dl>
|
|
</section>
|
|
</div>
|
|
|
|
<script type="text/javascript">
|
|
prettyPrint();
|
|
</script>
|