How can I trigger an onchange event manually? [duplicate]
There's a couple of ways you can do this. If the onchange listener is a function set via the element.onchange property and you're not bothered about the event object or bubbling/propagation, the easiest method is to just call that function:
element.onchange();If you need it to simulate the real event in full, or if you set the event via the html attribute or addEventListener/attachEvent, you need to do a bit of feature detection to correctly fire the event:
if ("createEvent" in document) { var evt = document.createEvent("HTMLEvents"); evt.initEvent("change", false, true); element.dispatchEvent(evt);}else element.fireEvent("onchange");
MDN suggests that there's a much cleaner way of doing this in modern browsers:
// Assuming we're listening for e.g. a 'change' event on `element`// Create a new 'change' eventvar event = new Event('change');// Dispatch it.element.dispatchEvent(event);