Assigning a selected value from a dropdown list to a php variable onchange, without pressing submit button in a html form?

Question

I have a html form and a dropdown list like this:

 <form name="form1" action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
  <div>     
    <span>Select Event</span> 
    <select id = "events" onchange="run()" class = "pass" style="width: 209px">
    <?php while($row = oci_fetch_array($curs)):?>
    <option value="<?php echo $row[0];?>"><?php echo $row[1];?></option>
    <? endwhile; ?>
    <input type="submit" name="action" value="New Event"> 
    </select>               
    TextBox1<br>
    <input type="text" id="srt" placeholder="get value on option select"><br>   
</div>
</form>

I can successfully show the values that I take from the database table. And after that I want to use the selected value for another query which needs this selected value simultaneously without pressing submit button.And my run function is like:

<script>
function run() {
    document.getElementById("srt").value = document.getElementById("events").value;
}

How can I assign this selected value to a php variable simultaneously?

    `

Answer 1

It is not possible. PHP script will never execute on onchange event. Don't confuse it with JavaScript. PHP scripts will only run on events like GET, POST, etc.