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    <p><strong>Updated</strong></p> <p>Your button for the form could make use of the <code>onClick</code> attribute, which would invoke a method to parse the form fields and post the data to your php script via <code>.ajax()</code>. </p> <p>In the <code>success</code> event method you then check any flags you need to and modify the element as you desire if needed.</p> <p>Basic example:</p> <p>Inside of <code>.ajax()</code>:</p> <pre><code>... url: 'xxx.xxx.xxx', async: true, type: 'POST', dataType: 'html', data: JSON.stringify( form_fields ), beforeSend: function() { // Pre send stuff, like starting a loading gif }, success: function( data, textStatus, xhr ) { // Be sure you load the page with the content first $( '#containing-div' ).html( data ); // Do your check here, and modify your element if needed here if( flagtocheck === 'xxx' ) { // Modify the element in question... } // I call a custom method termed `.ctrls()` here that makes any // adjustments to the DOM once its loaded/updated. }, error: function( xhr, textStatus, errorThrown ) { } </code></pre> <p>Of course, you'll want to set <code>flagtocheck</code> appropriately in your case.</p> <p>Hope that helps!</p> <p><strong>Note regarding edit</strong> <em>This post was edited to be a little more descriptive and more easily understood. Since the person asking the question is already using the <code>.ajax()</code> method, the <code>success</code> event method is the ideal place for doing what the person asking the question is requesting. It is 1 less method invocation to directly modify the element there than using it to call <code>.trigger()</code> or <code>.change()</code> which then also directly modifies the element.</em></p>
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    1. POhow to run an onchange function when page is loaded if the selected box is already selected
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    1. COIf they use AJAX to submit the form then there shouldn't be any need to trigger the `change` event anyway, since all of the page sections that are drawn by that would still be there. It's not a bad suggestion, but may be a non-trivial amount of work for them to do.
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