The readystatechange
event is fired whenever the readyState
property of the XMLHttpRequest
changes.
Warning: This should not be used with synchronous requests and must not be used from native code.
The readystatechange
event is fired whenever the readyState
property of the XMLHttpRequest
changes.
Warning: This should not be used with synchronous requests and must not be used from native code.
Use the event name in methods like addEventListener()
, or set an event handler property.
js
addEventListener("readystatechange", (event) => {}); onreadystatechange = (event) => {};
A generic Event
with no added properties.
js
const xhr = new XMLHttpRequest(); const method = "GET"; const url = "https://developer.mozilla.org/"; xhr.open(method, url, true); xhr.onreadystatechange = () => { // In local files, status is 0 upon success in Mozilla Firefox if (xhr.readyState === XMLHttpRequest.DONE) { const status = xhr.status; if (status === 0 || (status >= 200 && status < 400)) { // The request has been completed successfully console.log(xhr.responseText); } else { // Oh no! There has been an error with the request! } } }; xhr.send();
Specification |
---|
XMLHttpRequest Standard # event-xhr-readystatechange |
XMLHttpRequest Standard # handler-xhr-onreadystatechange |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
readystatechange_event |
1 | 12 | 1 | 5 | 9 | 1.2 | 4.4 | 18 | 4 | 10.1 | 1 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/readystatechange_event