JavaScript - fire onchange event manually

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In this short article, we would like to show you how to trigger onchange evet manually in JavaScript.

Quick solution:

if ('createEvent' in document) {
    var event = document.createEvent('HTMLEvents');
    event.initEvent('change', false, true); // onchange event
} else {
    element.fireEvent('change'); // only for backward compatibility (older browsers)


Practical example

The main advantage of the below solution is the custom dispatchEvent function calls onchange property and listener function for change event keeping backward compatibility.

// ONLINE-RUNNER:browser;

<!doctype html>
    var dispatchEvent = function(element, eventName) {
        if ('createEvent' in document) {
            var event = document.createEvent('HTMLEvents');
        	event.initEvent(eventName, false, true);
        } else {
            element.fireEvent(eventName); // only for backward compatibility (older browsers)
  <input id="element" value="Old value ..." onchange="console.log('onchange fired!')" />

    var element = document.querySelector('#element');
    element.addEventListener('change', function() {
    	console.log('addEventListener(\'onchange\', ...) fired!');
    // Usage example:
    setTimeout(function() {
        element.value = 'NEW!!! value ...';
    	dispatchEvent(element, 'change'); // <------ fires an event simulating a change in values
    }, 1000);
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