Window: error event

The error event is fired on a Window object when a resource failed to load or couldn't be used — for example if a script has an execution error.

Bubbles No
Cancelable No
Interface Event or UIEvent
Event handler property onerror

The event object is a UIEvent instance if it was generated from a user interface element, or an Event instance otherwise.

Examples

Live example

HTML

<div class="controls">
  <button id="script-error" type="button">Generate script error</button>
  <img class="bad-img" />
</div>

<div class="event-log">
  <label>Event log:</label>
  <textarea readonly class="event-log-contents" rows="8" cols="30"></textarea>
</div>

JS

const log = document.querySelector('.event-log-contents');

window.addEventListener('error', (event) => {
    log.textContent = log.textContent + `${event.type}: ${event.message}\n`;
    console.log(event)
});

const scriptError = document.querySelector('#script-error');
scriptError.addEventListener('click', () => {
    const badCode = 'const s;';
    eval(badCode);
});

Result

Specifications

Specification Status
UI Events Working Draft

Browser compatibility

BCD tables only load in the browser

See also

  • This event on Element targets: error event