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The XMLHttpRequestEventTarget.onerror is the function called when an XMLHttpRequest transaction fails due to an error.


XMLHttpRequest.onerror = callback;


  • callback is the function to be executed when the request fails.


var xmlhttp = new XMLHttpRequest(),
  method = 'GET',
  url = 'https://developer.mozilla.org/';

xmlhttp.open(method, url, true);
xmlhttp.onerror = function () {
  console.log("** An error occurred during the transaction");


Specification Status Comment
XMLHttpRequest Living Standard WHATWG living standard

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support ? ? ? ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? ? ? ? ? ? ?

Document Tags and Contributors

Contributors to this page: ExE-Boss, erikadoyle, teoli, rolfedh, Sheppy
Last updated by: ExE-Boss,