A string that will contain an error message after the onerror event has fired.
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | ||||
|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Firefox for Android | |
| Basic support | Chrome No support No | Edge No support No | Firefox Full support 57 | Opera No support No | Firefox Android Full support 57 |
Legend
- Full support
- Full support
- No support
- No support
Examples
This example adds an onerror listener which logs the value of error.
function listener(details) {
let filter = browser.webRequest.filterResponseData("12345");
filter.onerror = event => {
console.log(`Error: ${filter.error}`);
}
//return {}; // not needed
}
browser.webRequest.onBeforeRequest.addListener(
listener,
{urls: ["<all_urls>"], types: ["main_frame"]},
["blocking"]
);