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vendors/select2/docs/_includes/options-old/setting-default-options.html

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+<section>
+  <h1 id="setting-default-options">Setting default options</h1>
+
+  <p>
+    In some cases, you need to set the default options for all instances of
+    Select2 in your web application. This is especially useful when you are
+    migrating from past versions of Select2, or you are using non-standard
+    options <a href="#amd">like custom AMD builds</a>. Select2 exposes the
+    default options through <code>$.fn.select2.defaults</code>, which allows
+    you to set them globally.
+  </p>
+
+  <p>
+    When setting options globally, any past defaults that have been set will
+    be overriden. Default options are only used when an option is requested
+    that has not been set during initialization.
+  </p>
+
+  <p>
+    <strong>You can set default options</strong> by calling
+    <code>$.fn.select2.defaults.set("key", "value")</code>. The key that is
+    set should take the same format as keys set using
+    <a href="#data-attributes">HTML <code>data-*</code> attributes</a> which
+    means that two dashes (<code>--</code>) will be replaced by a level of
+    nesting, and a single dash (<code>-</code>) will convert it to a camelCase
+    string.
+  </p>
+
+<pre class="prettyprint">
+$.fn.select2.defaults.set("theme", "classic");
+</pre>
+
+  <p>
+    <strong>You can reset the default options</strong> by calling
+    <code>$.fn.select2.defaults.reset()</code>.
+  </p>
+</section>