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    <p>If you are using jQuery you can also do this</p> <pre><code>$('#leaveCode').val('14'); </code></pre> <p>This will select the option with the value of 14</p> <p><strong>Edit:</strong></p> <p>With plain Javascript, this can also be achieved with two <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document#Methods" rel="nofollow noreferrer">Document methods</a></p> <p>with <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector" rel="nofollow noreferrer">querySelector</a>, you can select an element based on CSS selector </p> <pre><code>document.querySelector('#leaveCode').value = '14' </code></pre> <p>Or the more established approach, with <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementById" rel="nofollow noreferrer">getDocumentById</a>, that will, as the name of the function implies, let you select an element based on there <code>id</code></p> <pre><code>document.getElementById('leaveCode').value = '14' </code></pre> <p>You can run the bellow code snipped to see these methods and the jQuery function in action.</p> <p><div class="snippet" data-lang="js" data-hide="true" data-console="true" data-babel="false"> <div class="snippet-code snippet-currently-hidden"> <pre class="snippet-code-js lang-js prettyprint-override"><code>const jQueryFunction = () =&gt; { $('#leaveCode').val('14'); } const querySelectorFunction = () =&gt; { document.querySelector('#leaveCode').value = '14' } const getElementByIdFunction = () =&gt; { document.getElementById('leaveCode').value='14' }</code></pre> <pre class="snippet-code-css lang-css prettyprint-override"><code>input { display:block; margin: 10px; padding: 10px }</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;select id="leaveCode" name="leaveCode"&gt; &lt;option value="10"&gt;Annual Leave&lt;/option&gt; &lt;option value="11"&gt;Medical Leave&lt;/option&gt; &lt;option value="14"&gt;Long Service&lt;/option&gt; &lt;option value="17"&gt;Leave Without Pay&lt;/option&gt; &lt;/select&gt; &lt;input type="button" value="$('#leaveCode').val('14');" onclick="jQueryFunction()" /&gt; &lt;input type="button" value="document.querySelector('#leaveCode').value = '14'" onclick="querySelectorFunction()" /&gt; &lt;input type="button" value="document.getElementById('leaveCode').value = '14'" onclick="getElementByIdFunction()" /&gt; &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;</code></pre> </div> </div> </p>
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    1. POHow do I programmatically set the value of a select box element using JavaScript?
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    1. USEinar Ólafsson
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