352 lines
9.9 KiB
HTML
352 lines
9.9 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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<h2>
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Display
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</h2>
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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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</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 must add an empty
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<code><option></option></code> tag that the placeholder
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should use, or it will 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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<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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<div class="alert alert-info">
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You <strong>pass in an object</strong> when you are using a framework that
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<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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<h3 id="translation">
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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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remove 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 array of objects that will be rendered by Select2.
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processResults: function (data) {
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return data;
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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="adapters">
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<div class="page-header">
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<h1>Adapters</h1>
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</div>
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</section>
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</div>
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<script type="text/javascript">
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prettyPrint();
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</script>
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