The progress
event is fired periodically when a request receives more data.
Examples
Live example
HTML
<div class="controls">
<input class="xhr success" type="button" name="xhr" value="Click to start XHR (success)" />
<input class="xhr error" type="button" name="xhr" value="Click to start XHR (error)" />
<input class="xhr abort" type="button" name="xhr" value="Click to start XHR (abort)" />
</div>
<textarea readonly class="event-log"></textarea>
CSS
.event-log {
width: 25rem;
height: 4rem;
border: 1px solid black;
margin: .5rem;
padding: .2rem;
}
input {
width: 11rem;
margin: .5rem;
}
JS
const xhrButtonSuccess = document.querySelector('.xhr.success');
const xhrButtonError = document.querySelector('.xhr.error');
const xhrButtonAbort = document.querySelector('.xhr.abort');
const log = document.querySelector('.event-log');
function handleEvent(e) {
log.textContent = log.textContent + `${e.type}: ${e.loaded} bytes transferred\n`;
}
function addListeners(xhr) {
xhr.addEventListener('loadstart', handleEvent);
xhr.addEventListener('load', handleEvent);
xhr.addEventListener('loadend', handleEvent);
xhr.addEventListener('progress', handleEvent);
xhr.addEventListener('error', handleEvent);
xhr.addEventListener('abort', handleEvent);
}
function runXHR(url) {
log.textContent = '';
const xhr = new XMLHttpRequest();
addListeners(xhr);
xhr.open("GET", url);
xhr.send();
return xhr;
}
xhrButtonSuccess.addEventListener('click', () => {
runXHR('https://mdn.mozillademos.org/files/16553/DgsZYJNXcAIPwzy.jpg');
});
xhrButtonError.addEventListener('click', () => {
runXHR('https://somewhere.org/i-dont-exist');
});
xhrButtonAbort.addEventListener('click', () => {
runXHR('https://mdn.mozillademos.org/files/16553/DgsZYJNXcAIPwzy.jpg').abort();
});
Result
Specifications
Browser compatibility
| Desktop | Mobile |
---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Firefox for Android | Opera for Android | Safari on iOS | Samsung Internet |
---|
progress event | Chrome
Full support
Yes | Edge
Full support
≤79 | Firefox
Full support
Yes | IE
Full support
10 | Opera
Full support
Yes | Safari
Full support
Yes | WebView Android
Full support
Yes | Chrome Android
Full support
Yes | Firefox Android
Full support
Yes | Opera Android
Full support
Yes | Safari iOS
?
| Samsung Internet Android
Full support
Yes |
---|
Legend
-
Full support
- Full support
-
Compatibility unknown
- Compatibility unknown
See also