791 lines
23 KiB
HTML
791 lines
23 KiB
HTML
<section>
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<h1 id="core-options" class="page-header">Core options</h1>
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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">
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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">
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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 id="core-options-display">
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Displaying selections
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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-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>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-6">
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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">
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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-6">
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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-6">
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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-6">
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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-6">
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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>templateResult</code></dd>
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<dt>Value</dt>
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<dd>A function taking a <code>result</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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<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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<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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<h2 id="core-options-results">
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Returning and displaying results
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</h2>
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<p>
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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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<h3 id="data">
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Array
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</h3>
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<p>
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Select2 allows creating the results based on an array of data objects that
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is included when initializing Select2.
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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>data</code></dd>
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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">
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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/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>
|