Find all needed information about Onreadystatechange Support. Below you can see links where you can find everything you want to know about Onreadystatechange Support.
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/onreadystatechange
An EventHandler that is called whenever the readyState attribute changes. The callback is called from the user interface thread. The XMLHttpRequest.onreadystatechange property contains the event handler to be called when the readystatechange event is fired, that is every time the readyState property of the XMLHttpRequest changes.
https://developer.mozilla.org/en-US/docs/Web/API/Document/readystatechange_event
The readystatechange event is fired when the readyState attribute of a document has changed.
https://stackoverflow.com/questions/14946291/can-one-replace-xhr-onreadystatechange-with-xhr-onload-for-ajax-calls
Since the original asker said "I need to support major modern browsers only (IE10+, FF, Chrome, Safari)" it is obvious that onload, onerror, etc are the ways to go. Also, as of today, onreadystatechange is pretty much obsolete, as you are obviously not going to support anything that old that it supports onreadystatechange only.
https://developer.apple.com/documentation/tvmljs/xmlhttprequest/1627414-onreadystatechange
Do not use this attribute in conjunction with synchronous requests. This attribute must be set to a function; for example, XMLHttp Request.onreadystatechange = function {}.
http://help.dottoro.com/ljerfwdm.php
In Internet Explorer, the onreadystatechange event can also occur on elements. The applet, embed, frame, frameset, iframe, img, input:image, link, script, xml elements support the onreadystatechange event because they load data. Furthermore, since Internet Explorer provides a way to attach external behavior files to any element (behavior style property and addBehavior method), an ...
https://www.w3schools.com/js/js_ajax_http.asp
The XMLHttpRequest Object. All modern browsers support the XMLHttpRequest object.. The XMLHttpRequest object can be used to exchange data with a web server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.
https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms757030(v=vs.85)
Using onReadyStateChange in Visual Basic applications. In Visual Basic, you can use any of the following approaches to design applications that support onreadystatechange events. Use a timer control to poll the readyState property. When the value of the readyState property indicates that the data is ready, turn the timer off.
https://stackoverflow.com/questions/8582663/pass-arguments-into-ajax-onreadystatechange-callback
What's the normal pure javascript (i.e. not JQuery) way to pass arguments into an anonymous onreadystatechange callback? For example: function doRequest(){ /* Get an XMLHttpRequest in a platf...
https://community.adobe.com/t5/ColdFusion/XMLHttpRequest-onreadystatechange-FireFox-vs-IE/td-p/9210925
Adobe Support Community ... I've placed an alert(xhr.status) at the very beginning of the onreadystatechange. IE11 is displaying all of the alerts at the precise times. On the FIRST click, FF52 is only alerting status 4 and displaying the returned content. So, for some reason, FF isn't seeing or reporting the first two status reports (1 and 3 ...
https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/platform-apis/aa769825(v=vs.85)
All elements expose an HTMLAnchorEvents::onreadystatechange event. The following objects always fire the event because they load data: applet, document, frame, frameSet, iframe, img, link, object, script, and xml elements. Other objects will only fire the HTMLAnchorEvents::onreadystatechange event when a DHTML Behavior is attached.
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