Testing Keydown Events In Jasmine With Specific KeyCode

September 15, 2022 Post a Comment

I am writing tests for an AngularJS directive which fires events of a

when certain keys are pressed. It all works fine per my manual testing. I want to be good and</div>

<h2 id="solution_1">Solution 1:

</h2>
<div class="answer-desc"><p>I've used the following solution to test it and having it working in Chrome, FF, PhantomJS and IE9+ based on this <a rel="nofollow noreferrer noopener" href="https://stackoverflow.com/questions/10455626/keydown-simulation-in-chrome-fires-normally-but-not-the-correct-key/12522769#12522769">SO answer</a>.
It doesn't work in Safari - tried millions of other solution without any success...</p>
<pre><code id="code_0" class="hljs language-javascript"><span class="hljs-keyword">function</span> <span class="hljs-title function_">jsKeydown</span>(<span class="hljs-params">code</span>){
  <span class="hljs-keyword">var</span> oEvent = <span class="hljs-variable language_">document</span>.<span class="hljs-title function_">createEvent</span>(<span class="hljs-string">'KeyboardEvent'</span>);

<span class="hljs-comment">// Chromium Hack: filter this otherwise Safari will complain</span>
  <span class="hljs-keyword">if</span>( navigator.<span class="hljs-property">userAgent</span>.<span class="hljs-title function_">toLowerCase</span>().<span class="hljs-title function_">indexOf</span>(<span class="hljs-string">'chrome'</span>) > -<span class="hljs-number">1</span> ){
    <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">defineProperty</span>(oEvent, <span class="hljs-string">'keyCode'</span>, {
      get : <span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) {
        <span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">keyCodeVal</span>;
      }
    });     
    <span class="hljs-title class_">Object</span>.<span class="hljs-title function_">defineProperty</span>(oEvent, <span class="hljs-string">'which'</span>, {
      get : <span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) {
        <span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>.<span class="hljs-property">keyCodeVal</span>;
      }
    });
  }

<span class="hljs-keyword">if</span> (oEvent.<span class="hljs-property">initKeyboardEvent</span>) {
    oEvent.<span class="hljs-title function_">initKeyboardEvent</span>(<span class="hljs-string">"keydown"</span>, <span class="hljs-literal">true</span>, <span class="hljs-literal">true</span>, <span class="hljs-variable language_">document</span>.<span class="hljs-property">defaultView</span>, <span class="hljs-literal">false</span>, <span class="hljs-literal">false</span>, <span class="hljs-literal">false</span>, <span class="hljs-literal">false</span>, code, code);
  } <span class="hljs-keyword">else</span> {
    oEvent.<span class="hljs-title function_">initKeyEvent</span>(<span class="hljs-string">"keydown"</span>, <span class="hljs-literal">true</span>, <span class="hljs-literal">true</span>, <span class="hljs-variable language_">document</span>.<span class="hljs-property">defaultView</span>, <span class="hljs-literal">false</span>, <span class="hljs-literal">false</span>, <span class="hljs-literal">false</span>, <span class="hljs-literal">false</span>, code, <span class="hljs-number">0</span>);
  }

oEvent.<span class="hljs-property">keyCodeVal</span> = code;

<span class="hljs-keyword">if</span> (oEvent.<span class="hljs-property">keyCode</span> !== code) {
    <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">"keyCode mismatch "</span> + oEvent.<span class="hljs-property">keyCode</span> + <span class="hljs-string">"("</span> + oEvent.<span class="hljs-property">which</span> + <span class="hljs-string">") -> "</span>+ code);
  }

<span class="hljs-variable language_">document</span>.<span class="hljs-title function_">getElementById</span>(<span class="hljs-string">"idToUseHere"</span>).<span class="hljs-title function_">dispatchEvent</span>(oEvent);
}

<span class="hljs-comment">// press DEL key</span>
<span class="hljs-title function_">jsKeydown</span>(<span class="hljs-number">46</span>);
</code><button class="copy-btn btn btn-secondary btn-sm" onclick="copyCode(this,'code_0')">Copy</button></pre>
<p>Hope it helps</p>
<h3>Update</h3>
<p>Today I've found and tested this solution which is offers a much wider coverage of browsers (enabling the legacy support):</p>
<p><a rel="nofollow noreferrer noopener" href="https://gist.github.com/termi/4654819">https://gist.github.com/termi/4654819</a></p>
<p>All the credit goes to the author of this GIST.
The code does support Safari, PhantomJS and IE9 - tested for the first 2.</p></div> 
<br>
<h2 id="solution_2">Solution 2:

</h2>
<div class="answer-desc"><p>Adding to @MarcoL answer, I'd like to point out for future readers who might stumble on this question, that the methods <code>initKeyboardEvent</code> and <code>initKeyEvent</code> are deprecated methods, and should no longer be used. See <a rel="nofollow noreferrer noopener" href="https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/initKeyboardEvent">here </a> and <a rel="nofollow noreferrer noopener" href="https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/initKeyEvent">here</a>.</p>
<p>Instead as the MDN docs suggested, events should be created via their respective constructor.</p></div>

<br>
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