839 lines
24 KiB
HTML
839 lines
24 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 overriden. 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.
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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>
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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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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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<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">
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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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<h2>
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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>
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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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The objects that the users can select from should be passed as an array
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with each object containing <code>id</code> and <code>text</code>
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properties.
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</p>
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<h3 id="ajax">
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AJAX
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</h3>
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<p>
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Select2 allows searching for results from remote data sources using AJAX
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requests.
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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>ajax</code></dd>
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<dt>Value</dt>
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<dd>object</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/ajax">AjaxAdapter</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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All options passed to this option will be directly passed to the
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<code>$.ajax</code> function that executes AJAX requests. There are a few
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custom options that Select2 will intercept, allowing you to customize the
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request as it is being made.
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<pre class="prettyprint">
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ajax: {
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// The number of milliseconds to wait for the user to stop typing before
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// issuing the ajax request.
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delay: 250,
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// You can craft a custom url based on the parameters that are passed into the
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// request. This is useful if you are using a framework which has
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// JavaScript-based functions for generating the urls to make requests to.
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//
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// @param params The object containing the parameters used to generate the
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// request.
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// @returns The url that the request should be made to.
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url: function (params) {
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return UrlGenerator.Random();
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},
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// You can pass custom data into the request based on the parameters used to
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// make the request. For `GET` requests, the default method, these are the
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// query parameters that are appended to the url. For `POST` requests, this
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// is the form data that will be passed into the request. For other requests,
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// the data returned from here should be customized based on what jQuery and
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// your server are expecting.
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//
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// @param params The object containing the parameters used to generate the
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// request.
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// @returns Data to be directly passed into the request.
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data: function (params) {
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var queryParameters = {
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q: params.term
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}
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return queryParameters;
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},
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// You can modify the results that are returned from the server, allowing you
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// to make last-minute changes to the data, or find the correct part of the
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// response to pass to Select2. Keep in mind that results should be passed as
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// an array of objects.
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//
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// @param data The data as it is returned directly by jQuery.
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// @returns An object containing the results data as well as any required
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// metadata that is used by plugins. The object should contain an array of
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// data objects as the `results` key.
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processResults: function (data) {
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return {
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results: data
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};
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}
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}
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</pre>
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</p>
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<h3 id="tags">
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Tags
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</h3>
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<p>
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Users can create their own options based on the text that they have
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entered.
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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>tags</code></dd>
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<dt>Value</dt>
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<dd>boolean / 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/base">DataAdapter</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/data/tags">Tags</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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If the <code>tags</code> option is passed into Select2, if a user types
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anything into the search box which doesn't already exist, it will be
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displayed at the top and the user will be able to select it.
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</p>
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<p>
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<strong>For backwards compatibility</strong>, if an array of objects is
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passed in with the <code>tags</code> option, the options will be
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automatically created and the user will be able to select from them.
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This is the <strong>same as how <a href="#data">array data</a>
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works</strong>, and has similar limitations.
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</p>
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</section>
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<section id="dropdown">
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<div class="page-header">
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<h1>Dropdown</h1>
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</div>
|
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<p>
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Select2 allows you to change the way that the dropdown works, allowing you
|
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to do anything from attach it to a different location in the document or
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add a search box.
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</p>
|
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<h2 id="dropdownParent">
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Attached to body
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</h2>
|
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<p>
|
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By default, Select2 will attach the dropdown to the end of the body and
|
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will absolutely position it to appear below the selection container.
|
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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>dropdownParent</code></dd>
|
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<dt>Value</dt>
|
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<dd>jQuery element or DOM node</dd>
|
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<hr />
|
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|
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<dt>Adapter</dt>
|
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<dd>
|
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<code title="select2/dropdown">DropdownAdapter</code>
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</dd>
|
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|
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<dt>Decorator</dt>
|
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<dd>
|
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<code title="select2/dropdown/attachBody">AttachBody</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>
|
|
This will cause DOM events to be raised outside of the standard
|
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Select2 DOM container. This can cause issues with
|
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third-party components such as modals.
|
|
</div>
|
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</div>
|
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</div>
|
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|
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<p>
|
|
When the dropdown is attached to the body, you are not limited to just
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displaying the dropdown below the container. Select2 will display above
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the container if there is not enough space below the container, but there
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is enough space above it. You are also not limited to displaying the
|
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drodown within the parent container, which means Select2 will render
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correctly inside of modals and other small containers.
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|
</p>
|
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|
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<h2 id="dropdown-attachContainer">
|
|
Attached below the container
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</h2>
|
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|
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<p>
|
|
Select2 can place the dropdown directly after the selection cotainer, so
|
|
it will appear in the same location within the DOM as the rest of Select2.
|
|
</p>
|
|
|
|
<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 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>
|
|
</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 adpaters 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 paramter 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 cotrolling 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>
|
|
</div>
|
|
|
|
<script type="text/javascript">
|
|
prettyPrint();
|
|
</script>
|