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    Identifiying Events with the Developer Tools
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                  <a href="https://github.com/WoltLab/docs.woltlab.com/edit/5.4/docs/javascript/new-api_events.md" title="Edit this page" class="md-content__button md-icon">
                    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
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                <h1 id="event-handling-javascript-api">Event Handling - JavaScript API<a class="headerlink" href="#event-handling-javascript-api" title="Permanent link">#</a></h1>
<h2 id="eventkey"><code>EventKey</code><a class="headerlink" href="#eventkey" title="Permanent link">#</a></h2>
<p>This class offers a set of static methods that can be used to determine if some
common keys are being pressed. Internally it compares either the <code>.key</code> property
if it is supported or the value of <code>.which</code>.</p>
<div class="highlight"><pre><span></span><code><span class="nx">require</span><span class="p">([</span><span class="s2">&quot;EventKey&quot;</span><span class="p">],</span> <span class="kd">function</span><span class="p">(</span><span class="nx">EventKey</span><span class="p">)</span> <span class="p">{</span>
  <span class="nx">elBySel</span><span class="p">(</span><span class="s2">&quot;.some-input&quot;</span><span class="p">).</span><span class="nx">addEventListener</span><span class="p">(</span><span class="s2">&quot;keydown&quot;</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">event</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="nx">EventKey</span><span class="p">.</span><span class="nx">Enter</span><span class="p">(</span><span class="nx">event</span><span class="p">))</span> <span class="p">{</span>
      <span class="c1">// the `Enter` key was pressed</span>
    <span class="p">}</span>
  <span class="p">});</span>
<span class="p">});</span>
</code></pre></div>
<h3 id="arrowdownevent-keyboardevent-boolean"><code>ArrowDown(event: KeyboardEvent): boolean</code><a class="headerlink" href="#arrowdownevent-keyboardevent-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the user has pressed the <code>↓</code> key.</p>
<h3 id="arrowleftevent-keyboardevent-boolean"><code>ArrowLeft(event: KeyboardEvent): boolean</code><a class="headerlink" href="#arrowleftevent-keyboardevent-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the user has pressed the <code>←</code> key.</p>
<h3 id="arrowrightevent-keyboardevent-boolean"><code>ArrowRight(event: KeyboardEvent): boolean</code><a class="headerlink" href="#arrowrightevent-keyboardevent-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the user has pressed the <code>→</code> key.</p>
<h3 id="arrowupevent-keyboardevent-boolean"><code>ArrowUp(event: KeyboardEvent): boolean</code><a class="headerlink" href="#arrowupevent-keyboardevent-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the user has pressed the <code>↑</code> key.</p>
<h3 id="commaevent-keyboardevent-boolean"><code>Comma(event: KeyboardEvent): boolean</code><a class="headerlink" href="#commaevent-keyboardevent-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the user has pressed the <code>,</code> key.</p>
<h3 id="enterevent-keyboardevent-boolean"><code>Enter(event: KeyboardEvent): boolean</code><a class="headerlink" href="#enterevent-keyboardevent-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the user has pressed the <code>↲</code> key.</p>
<h3 id="escapeevent-keyboardevent-boolean"><code>Escape(event: KeyboardEvent): boolean</code><a class="headerlink" href="#escapeevent-keyboardevent-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the user has pressed the <code>Esc</code> key.</p>
<h3 id="tabevent-keyboardevent-boolean"><code>Tab(event: KeyboardEvent): boolean</code><a class="headerlink" href="#tabevent-keyboardevent-boolean" title="Permanent link">#</a></h3>
<p>Returns true if the user has pressed the <code>↹</code> key.</p>
<h2 id="eventhandler"><code>EventHandler</code><a class="headerlink" href="#eventhandler" title="Permanent link">#</a></h2>
<p>A synchronous event system based on string identifiers rather than DOM elements,
similar to the PHP event system in WoltLab Suite. Any components can listen to
events or trigger events itself at any time.</p>
<h3 id="identifiying-events-with-the-developer-tools">Identifiying Events with the Developer Tools<a class="headerlink" href="#identifiying-events-with-the-developer-tools" title="Permanent link">#</a></h3>
<p>The Developer Tools in WoltLab Suite 3.1 offer an easy option to identify existing
events that are fired while code is being executed. You can enable this watch
mode through your browser's console using <code>Devtools.toggleEventLogging()</code>:</p>
<div class="highlight"><pre><span></span><code>&gt; Devtools.toggleEventLogging();
&lt;   Event logging enabled
&lt; [Devtools.EventLogging] Firing event: bar @ com.example.app.foo
&lt; [Devtools.EventLogging] Firing event: baz @ com.example.app.foo
</code></pre></div>
<h3 id="addidentifier-string-action-string-callback-data-object-void-string"><code>add(identifier: string, action: string, callback: (data: Object) =&gt; void): string</code><a class="headerlink" href="#addidentifier-string-action-string-callback-data-object-void-string" title="Permanent link">#</a></h3>
<p>Adding an event listeners returns a randomly generated UUIDv4 that is used to
identify the listener. This UUID is required to remove a specific listener through
the <code>remove()</code> method.</p>
<h3 id="fireidentifier-string-action-string-data-object"><code>fire(identifier: string, action: string, data?: Object)</code><a class="headerlink" href="#fireidentifier-string-action-string-data-object" title="Permanent link">#</a></h3>
<p>Triggers an event using an optional <code>data</code> object that is passed to each listener
by reference.</p>
<h3 id="removeidentifier-string-action-string-uuid-string"><code>remove(identifier: string, action: string, uuid: string)</code><a class="headerlink" href="#removeidentifier-string-action-string-uuid-string" title="Permanent link">#</a></h3>
<p>Removes a previously registered event listener using the UUID returned by <code>add()</code>.</p>
<h3 id="removeallidentifier-string-action-string"><code>removeAll(identifier: string, action: string)</code><a class="headerlink" href="#removeallidentifier-string-action-string" title="Permanent link">#</a></h3>
<p>Removes all event listeners registered for the provided <code>identifier</code> and <code>action</code>.</p>
<h3 id="removeallbysuffixidentifier-string-suffix-string"><code>removeAllBySuffix(identifier: string, suffix: string)</code><a class="headerlink" href="#removeallbysuffixidentifier-string-suffix-string" title="Permanent link">#</a></h3>
<p>Removes all event listeners for an <code>identifier</code> whose action ends with the value
of <code>suffix</code>.</p>
                
                  
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