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<!DOCTYPE html><html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="themes/luci-theme-bootstrap/htdocs/luci-static/bootstrap/logo.svg"><link type="text/css" rel="stylesheet" href="extra.css"><title>Class: Dropdown</title><!--[if lt IE 9]>
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class="sidebar-section-children"><a href="LuCI.validation.ValidatorFactory.html">ValidatorFactory</a></div><div class="sidebar-section-children"><a href="LuCI.view.html">view</a></div><div class="sidebar-section-children"><a href="LuCI.xhr.html">xhr</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-externals"><div>Externals</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="external-String.html">String</a></div></div></div></div></div><div class="navbar-container" id="VuAckcnZhf"><nav class="navbar"><div class="navbar-left-items"><div class="github-home navbar-item"><a id="" href="https://github.com/openwrt/luci" target="">GitHub Project Page</a></div></div><div class="navbar-right-items"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#dark-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section><header><h1 id="Dropdown-title" class="has-anchor"><span class="ancestors"><a href="LuCI.html">LuCI</a><a href="LuCI.ui.html">.ui</a>.</span> Dropdown</h1><div class="class-description"><p>The <code>Dropdown</code> class implements a rich, stylable dropdown menu which supports non-text choice labels.</p><p>UI widget instances are usually not supposed to be created by view code directly, instead they're implicitly created by <code>LuCI.form</code> when instantiating CBI forms.</p><p>This class is automatically instantiated as part of <code>LuCI.ui</code>. To use it in views, use <code>'require ui'</code> and refer to <code>ui.Dropdown</code>. To import it in external JavaScript, use <code>L.require("ui").then(...)</code> and access the <code>Dropdown</code> property of the class instance value.</p></div></header><article><div class="container-overview"><h2 id="constructor" class="has-anchor">Constructor</h2><h3 class="name has-anchor" id="Dropdown"><span class="type-signature"></span>new Dropdown<span class="signature">(value<span class="signature-attributes">opt</span>, choices, options<span class="signature-attributes">opt</span>)</span></h3><div class="description"><p>Instantiate a rich dropdown choice widget.</p></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th>Attributes</th><th>Default</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>value</code></td><td class="type"><span class="param-type">string</span> |<wbr> <span class="param-type">Array.<string></span></td><td class="attributes"><optional><br></td><td class="default">null</td><td class="description last"><p>The initial input value(s).</p></td></tr><tr><td class="name"><code>choices</code></td><td class="type"><span class="param-type">Object.<string, *></span></td><td class="attributes"></td><td class="default"></td><td class="description last"><p>Object containing the selectable choices of the widget. The object keys serve as values for the different choices while the values are used as choice labels.</p></td></tr><tr><td class="name"><code>options</code></td><td class="type"><span class="param-type"><a href="LuCI.ui.Dropdown.html#.InitOptions">LuCI.<wbr>ui.<wbr>Dropdown.<wbr>InitOptions</a></span></td><td class="attributes"><optional><br></td><td class="default"></td><td class="description last"><p>Object describing the widget specific options to initialize the dropdown.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line929">line 929</a></li></ul></dd></div></dl></div><h2 id="Extends" class="subsection-title has-anchor">Extends</h2><ul><li><a href="LuCI.ui.AbstractElement.html">LuCI.ui.AbstractElement</a></li></ul><h2 id="methods" class="subsection-title has-anchor">Methods</h2><h3 class="name has-anchor" id="addChoices"><span class="type-signature"></span>addChoices<span class="signature">(values, labels)</span></h3><div class="description"><p>Add new choices to the dropdown menu.</p><p>This function adds further choices to an existing dropdown menu, ignoring choice values which are already present.</p></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>values</code></td><td class="type"><span class="param-type">Array.<string></span></td><td class="description last"><p>The choice values to add to the dropdown widget.</p></td></tr><tr><td class="name"><code>labels</code></td><td class="type"><span class="param-type">Object.<string, *></span></td><td class="description last"><p>The choice label values to use when adding dropdown choices. If no label is found for a particular choice value, the value itself is used as label text. Choice labels may be any valid value accepted by <a href="LuCI.dom.html#content"><code>LuCI.dom#content</code></a>.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line1804">line 1804</a></li></ul></dd></div></dl><h3 class="name has-anchor" id="clearChoices"><span class="type-signature"></span>clearChoices<span class="signature">(reset_value<span class="signature-attributes">opt</span>)</span></h3><div class="description"><p>Remove all existing choices from the dropdown menu.</p><p>This function removes all preexisting dropdown choices from the widget, keeping only choices currently being selected unless <code>reset_values</code> is given, in which case all choices and deselected and removed.</p></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th>Attributes</th><th>Default</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>reset_value</code></td><td class="type"><span class="param-type">boolean</span></td><td class="attributes"><optional><br></td><td class="default">false</td><td class="description last"><p>If set to <code>true</code>, deselect and remove selected choices as well instead of keeping them.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line1769">line 1769</a></li></ul></dd></div></dl><h3 class="name has-anchor" id="closeAllDropdowns"><span class="type-signature"></span>closeAllDropdowns<span class="signature">()</span></h3><div class="description"><p>Close all open dropdown widgets in the current document.</p></div><dl class="details"><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line1837">line 1837</a></li></ul></dd></div></dl><h3 class="name has-anchor" id="getValidationError"><span class="type-signature"></span>getValidationError<span class="signature">()</span><span class="type-signature"> → {string}</span></h3><div class="description"><p>Returns the current validation error</p></div><dl class="details"><div class="details-item-container"><dt class="inherited-from bold">Inherited From</dt><dd class="inherited-from"><ul><li><a href="LuCI.ui.AbstractElement.html#getValidationError">LuCI.ui.AbstractElement#getValidationError</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line169">line 169</a></li></ul></dd></div></dl><div class="method-member-container mt-20"><strong>Returns:</strong><div class="param-desc"><p>The validation error at this time</p></div><dl class="param-type"><dt>Type: </dt><dd><span class="param-type">string</span></dd></dl></div><h3 class="name has-anchor" id="getValue"><span class="type-signature"></span>getValue<span class="signature">()</span><span class="type-signature"> → {string|Array.<string>|null}</span></h3><div class="description"><p>Read the current value of the input widget.</p></div><dl class="details"><div class="details-item-container"><dt class="tag-overrides bold">Overrides</dt><dd class="tag-overrides"><ul><li><a href="LuCI.ui.AbstractElement.html#getValue">LuCI.ui.AbstractElement#getValue</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line2111">line 2111</a></li></ul></dd></div></dl><div class="method-member-container mt-20"><strong>Returns:</strong><div class="param-desc"><p>The current value of the input element. For simple inputs like text fields or selects, the return value type will be a - possibly empty - string. Complex widgets such as <code>DynamicList</code> instances may result in an array of strings or <code>null</code> for unset values.</p></div><dl class="param-type"><dt>Type: </dt><dd><span class="param-type">string</span> |<wbr> <span class="param-type">Array.<string></span> |<wbr> <span class="param-type">null</span></dd></dl></div><h3 class="name has-anchor" id="isChanged"><span class="type-signature"></span>isChanged<span class="signature">()</span><span class="type-signature"> → {boolean}</span></h3><div class="description"><p>Check whether the input value was altered by the user.</p></div><dl class="details"><div class="details-item-container"><dt class="inherited-from bold">Inherited From</dt><dd class="inherited-from"><ul><li><a href="LuCI.ui.AbstractElement.html#isChanged">LuCI.ui.AbstractElement#isChanged</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line144">line 144</a></li></ul></dd></div></dl><div class="method-member-container mt-20"><strong>Returns:</strong><div class="param-desc"><p>Returns <code>true</code> if the input value has been altered by the user or <code>false</code> if it is unchanged. Note that if the user modifies the initial value and changes it back to the original state, it is still reported as changed.</p></div><dl class="param-type"><dt>Type: </dt><dd><span class="param-type">boolean</span></dd></dl></div><h3 class="name has-anchor" id="isValid"><span class="type-signature"></span>isValid<span class="signature">()</span><span class="type-signature"> → {boolean}</span></h3><div class="description"><p>Check whether the current input value is valid.</p></div><dl class="details"><div class="details-item-container"><dt class="inherited-from bold">Inherited From</dt><dd class="inherited-from"><ul><li><a href="LuCI.ui.AbstractElement.html#isValid">LuCI.ui.AbstractElement#isValid</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line157">line 157</a></li></ul></dd></div></dl><div class="method-member-container mt-20"><strong>Returns:</strong><div class="param-desc"><p>Returns <code>true</code> if the current input value is valid or <code>false</code> if it does not meet the validation constraints.</p></div><dl class="param-type"><dt>Type: </dt><dd><span class="param-type">boolean</span></dd></dl></div><h3 class="name has-anchor" id="registerEvents"><span class="type-signature"></span>registerEvents<span class="signature">(targetNode, synevent, events)</span></h3><div class="description"><p>Dispatch a custom (synthetic) event in response to received events.</p><p>Sets up event handlers on the given target DOM node for the given event names that dispatch a custom event of the given type to the widget root DOM node.</p><p>The primary purpose of this function is to set up a series of custom uniform standard events such as <code>widget-update</code>, <code>validation-success</code>, <code>validation-failure</code> etc. which are triggered by various different widget specific native DOM events.</p></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>targetNode</code></td><td class="type"><span class="param-type">Node</span></td><td class="description last"><p>Specifies the DOM node on which the native event listeners should be registered.</p></td></tr><tr><td class="name"><code>synevent</code></td><td class="type"><span class="param-type">string</span></td><td class="description last"><p>The name of the custom event to dispatch to the widget root DOM node.</p></td></tr><tr><td class="name"><code>events</code></td><td class="type"><span class="param-type">Array.<string></span></td><td class="description last"><p>The native DOM events for which event handlers should be registered.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="inherited-from bold">Inherited From</dt><dd class="inherited-from"><ul><li><a href="LuCI.ui.AbstractElement.html#registerEvents">LuCI.ui.AbstractElement#registerEvents</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line219">line 219</a></li></ul></dd></div></dl><h3 class="name has-anchor" id="render"><span class="type-signature"></span>render<span class="signature">()</span><span class="type-signature"> → {Node}</span></h3><div class="description"><p>Render the widget, set up event listeners and return resulting markup.</p></div><dl class="details"><div class="details-item-container"><dt class="tag-overrides bold">Overrides</dt><dd class="tag-overrides"><ul><li><a href="LuCI.ui.AbstractElement.html#render">LuCI.ui.AbstractElement#render</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line1086">line 1086</a></li></ul></dd></div></dl><div class="method-member-container mt-20"><strong>Returns:</strong><div class="param-desc"><p>Returns a DOM Node or DocumentFragment containing the rendered widget markup.</p></div><dl class="param-type"><dt>Type: </dt><dd><span class="param-type">Node</span></dd></dl></div><h3 class="name has-anchor" id="setChangeEvents"><span class="type-signature"></span>setChangeEvents<span class="signature">(targetNode, …events)</span></h3><div class="description"><p>Set up listeners for native DOM events that may change the widget value.</p><p>Sets up event handlers on the given target DOM node for the given event names which may cause the input value to change completely, such as <code>change</code> events in a select menu. In contrast to update events, such change events will not trigger input value validation but they may cause field dependencies to get re-evaluated and will mark the input widget as dirty.</p></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th>Attributes</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>targetNode</code></td><td class="type"><span class="param-type">Node</span></td><td class="attributes"></td><td class="description last"><p>Specifies the DOM node on which the event listeners should be registered.</p></td></tr><tr><td class="name"><code>events</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"><repeatable><br></td><td class="description last"><p>The DOM events for which event handlers should be registered.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="inherited-from bold">Inherited From</dt><dd class="inherited-from"><ul><li><a href="LuCI.ui.AbstractElement.html#setChangeEvents">LuCI.ui.AbstractElement#setChangeEvents</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line288">line 288</a></li></ul></dd></div></dl><h3 class="name has-anchor" id="setPlaceholder"><span class="type-signature"></span>setPlaceholder<span class="signature">(value)</span></h3><div class="description"><p>Set the current placeholder value of the input widget.</p></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>value</code></td><td class="type"><span class="param-type">string</span> |<wbr> <span class="param-type">Array.<string></span> |<wbr> <span class="param-type">null</span></td><td class="description last"><p>The placeholder to set for the input element. Only applicable to text inputs, not to radio buttons, selects or similar.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="inherited-from bold">Inherited From</dt><dd class="inherited-from"><ul><li><a href="LuCI.ui.AbstractElement.html#setPlaceholder">LuCI.ui.AbstractElement#setPlaceholder</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line116">line 116</a></li></ul></dd></div></dl><h3 class="name has-anchor" id="setUpdateEvents"><span class="type-signature"></span>setUpdateEvents<span class="signature">(targetNode, …events)</span></h3><div class="description"><p>Set up listeners for native DOM events that may update the widget value.</p><p>Sets up event handlers on the given target DOM node for the given event names which may cause the input value to update, such as <code>keyup</code> or <code>onclick</code> events. In contrast to change events, such update events will trigger input value validation.</p></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th>Attributes</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>targetNode</code></td><td class="type"><span class="param-type">Node</span></td><td class="attributes"></td><td class="description last"><p>Specifies the DOM node on which the event listeners should be registered.</p></td></tr><tr><td class="name"><code>events</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"><repeatable><br></td><td class="description last"><p>The DOM events for which event handlers should be registered.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="inherited-from bold">Inherited From</dt><dd class="inherited-from"><ul><li><a href="LuCI.ui.AbstractElement.html#setUpdateEvents">LuCI.ui.AbstractElement#setUpdateEvents</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line244">line 244</a></li></ul></dd></div></dl><h3 class="name has-anchor" id="setValue"><span class="type-signature"></span>setValue<span class="signature">(value)</span></h3><div class="description"><p>Set the current value of the input widget.</p></div><div class="method-member-container flex flex-col w-100 overflow-auto mt-20"><strong>Parameters:</strong><table class="params"><thead><tr><th>Name</th><th>Type</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>value</code></td><td class="type"><span class="param-type">string</span> |<wbr> <span class="param-type">Array.<string></span> |<wbr> <span class="param-type">null</span></td><td class="description last"><p>The value to set the input element to. For simple inputs like text fields or selects, the value should be a - possibly empty - string. Complex widgets such as <code>DynamicList</code> instances may accept string array or <code>null</code> values.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="tag-overrides bold">Overrides</dt><dd class="tag-overrides"><ul><li><a href="LuCI.ui.AbstractElement.html#setValue">LuCI.ui.AbstractElement#setValue</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line2084">line 2084</a></li></ul></dd></div></dl><h3 class="name has-anchor" id="triggerValidation"><span class="type-signature"></span>triggerValidation<span class="signature">()</span><span class="type-signature"> → {boolean}</span></h3><div class="description"><p>Force validation of the current input value.</p><p>Usually input validation is automatically triggered by various DOM events bound to the input widget. In some cases it is required though to manually trigger validation runs, e.g. when programmatically altering values.</p></div><dl class="details"><div class="details-item-container"><dt class="inherited-from bold">Inherited From</dt><dd class="inherited-from"><ul><li><a href="LuCI.ui.AbstractElement.html#triggerValidation">LuCI.ui.AbstractElement#triggerValidation</a></li></ul></dd></div><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line184">line 184</a></li></ul></dd></div></dl><div class="method-member-container mt-20"><strong>Returns:</strong><dl class="param-type"><dt>Type: </dt><dd><span class="param-type">boolean</span></dd></dl></div><h2 id="type-definitions" class="subsection-title has-anchor">Type Definitions</h2><h3 class="name has-anchor" id=".InitOptions">InitOptions</h3><div class="description"><p>In addition to the <a href="LuCI.ui.AbstractElement.html#.InitOptions"><code>AbstractElement.InitOptions</code></a> the following properties are recognized:</p></div><div class="member-item-container flex"><strong>Type:</strong><ul><li><span class="param-type"><a href="LuCI.ui.AbstractElement.html#.InitOptions">LuCI.<wbr>ui.<wbr>AbstractElement.<wbr>InitOptions</a></span></li></ul></div><b class="subsection-title">Properties</b><div class="allow-overflow"><table class="props"><thead><tr><th>Name</th><th>Type</th><th>Attributes</th><th>Default</th><th class="last">Description</th></tr></thead><tbody><tr><td class="name"><code>optional</code></td><td class="type"><span class="param-type">boolean</span></td><td class="attributes"><optional><br></td><td class="default">true</td><td class="description last"><p>Specifies whether the dropdown selection is optional. In contrast to other widgets, the <code>optional</code> constraint of dropdowns works differently; instead of marking the widget invalid on empty values when set to <code>false</code>, the user is not allowed to deselect all choices.</p><p>For single value dropdowns that means that no empty "please select" choice is offered and for multi value dropdowns, the last selected choice may not be deselected without selecting another choice first.</p></td></tr><tr><td class="name"><code>multiple</code></td><td class="type"><span class="param-type">boolean</span></td><td class="attributes"><optional><br></td><td class="default"></td><td class="description last"><p>Specifies whether multiple choice values may be selected. It defaults to <code>true</code> when an array is passed as input value to the constructor.</p></td></tr><tr><td class="name"><code>sort</code></td><td class="type"><span class="param-type">boolean</span> |<wbr> <span class="param-type">Array.<string></span></td><td class="attributes"><optional><br></td><td class="default">false</td><td class="description last"><p>Specifies if and how to sort choice values. If set to <code>true</code>, the choice values will be sorted alphabetically. If set to an array of strings, the choice sort order is derived from the array.</p></td></tr><tr><td class="name"><code>select_placeholder</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"><optional><br></td><td class="default">-- Please choose --</td><td class="description last"><p>Specifies a placeholder text which is displayed when no choice is selected yet.</p></td></tr><tr><td class="name"><code>custom_placeholder</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"><optional><br></td><td class="default">-- custom --</td><td class="description last"><p>Specifies a placeholder text which is displayed in the text input field allowing to enter custom choice values. Only applicable if the <code>create</code> option is set to <code>true</code>.</p></td></tr><tr><td class="name"><code>create</code></td><td class="type"><span class="param-type">boolean</span></td><td class="attributes"><optional><br></td><td class="default">false</td><td class="description last"><p>Specifies whether custom choices may be entered into the dropdown widget.</p></td></tr><tr><td class="name"><code>create_query</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"><optional><br></td><td class="default">.create-item-input</td><td class="description last"><p>Specifies a CSS selector expression used to find the input element which is used to enter custom choice values. This should not normally be used except by widgets derived from the Dropdown class.</p></td></tr><tr><td class="name"><code>create_template</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"><optional><br></td><td class="default">"script[type='item-template']"</td><td class="description last"><p>Specifies a CSS selector expression used to find an HTML element serving as template for newly added custom choice values.</p><p>Any <code>{{value}}</code> placeholder string within the template elements text content will be replaced by the user supplied choice value, the resulting string is parsed as HTML and appended to the end of the choice list. The template markup may specify one HTML element with a <code>data-label-placeholder</code> attribute which is replaced by a matching label value from the <code>choices</code> object or with the user supplied value itself in case <code>choices</code> contains no matching choice label.</p><p>If the template element is not found or if no <code>create_template</code> selector expression is specified, the default markup for newly created elements is <code><li data-value="{{value}}"><span data-label-placeholder="true" /></li></code>.</p></td></tr><tr><td class="name"><code>create_markup</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"><optional><br></td><td class="default"></td><td class="description last"><p>This property allows specifying the markup for custom choices directly instead of referring to a template element through CSS selectors.</p><p>Apart from that it works exactly like <code>create_template</code>.</p></td></tr><tr><td class="name"><code>display_items</code></td><td class="type"><span class="param-type">number</span></td><td class="attributes"><optional><br></td><td class="default">3</td><td class="description last"><p>Specifies the maximum amount of choice labels that should be shown in collapsed dropdown state before further selected choices are cut off.</p><p>Only applicable when <code>multiple</code> is <code>true</code>.</p></td></tr><tr><td class="name"><code>dropdown_items</code></td><td class="type"><span class="param-type">number</span></td><td class="attributes"><optional><br></td><td class="default">-1</td><td class="description last"><p>Specifies the maximum amount of choices that should be shown when the dropdown is open. If the amount of available choices exceeds this number, the dropdown area must be scrolled to reach further items.</p><p>If set to <code>-1</code>, the dropdown menu will attempt to show all choice values and only resort to scrolling if the amount of choices exceeds the available screen space above and below the dropdown widget.</p></td></tr><tr><td class="name"><code>placeholder</code></td><td class="type"><span class="param-type">string</span></td><td class="attributes"><optional><br></td><td class="default"></td><td class="description last"><p>This property serves as a shortcut to set both <code>select_placeholder</code> and <code>custom_placeholder</code>. Either of these properties will fallback to <code>placeholder</code> if not specified.</p></td></tr><tr><td class="name"><code>readonly</code></td><td class="type"><span class="param-type">boolean</span></td><td class="attributes"><optional><br></td><td class="default">false</td><td class="description last"><p>Specifies whether the custom choice input field should be rendered readonly. Only applicable when <code>create</code> is <code>true</code>.</p></td></tr><tr><td class="name"><code>maxlength</code></td><td class="type"><span class="param-type">number</span></td><td class="attributes"><optional><br></td><td class="default"></td><td class="description last"><p>Specifies the HTML <code>maxlength</code> attribute to set on the custom choice <code><input></code> element. Note that this a legacy property that exists for compatibility reasons. It is usually better to <code>maxlength(N)</code> validation expression. Only applicable when <code>create</code> is <code>true</code>.</p></td></tr></tbody></table></div><dl class="details"><div class="details-item-container"><dt class="tag-source bold">Source</dt><dd class="tag-source"><ul><li><a href="ui.js.html">ui.js</a>, <a href="ui.js.html#line962">line 962</a></li></ul></dd></div></dl></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" 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