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How to get a checkbox to update a database onclick without a submit button?


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Javascript runs on the client, PHP on the server, so you can't incorporate PHP code inside JS.

What you can do is submit an AJAX request from JS to the server, process it with PHP and send back the results as a response.

In JQuery, look at

  • $.ajax()
  • $.get()
  • $.post()

Here's a very basic example

if (isset($_GET['ajax']))  {                     // I like to tell my script it's reciving AJAX
    $x = $_GET['x'] ?? 0;
    exit("$x squared is " . ($x**2));            // when process an AJAX request, anything that would normally be sent to the screen 
}                                                // is sent back in a response message

// rest of php code here
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js"></script>
<script type='text/javascript'>
   $().ready( function() {
       $("#btnSub").click( function() {
           $.get (
                "",                                         //  target script is "self"
                {"ajax":1, "x":$("#x").val() },             // data to send
                function(resp) {                            // process response
                "TEXT"                                      // response type
Input a number <input type='text' id='x' value='0'>
<button id='btnSub'>Get Square</button>
<div id='result'></div>


Edited by Barand
  • Great Answer 1
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