How to Manually Trigger an Onchange Event After Setting Input Value with a Widget?

How to Trigger an Onchange Event Manually When Setting Input Value via a Widget

When dynamically updating the value of a date-time textfield through a calendar widget, the need arises to trigger an onchange event manually. This is because the widget's value assignment, like document.getElementById('datetimetext').value = date_value;, circumvents the default event trigger.

The solution lies in manually dispatching a custom event object, as suggested by MDN:

// Assuming we're listening for e.g. a 'change' event on `element`

// Create a new 'change' event
var event = new Event('change');

// Dispatch it.
element.dispatchEvent(event);

By dispatching this custom event, you can manually trigger the onchange event handler, allowing you to reset other fields in the page as needed.

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