Element: error event - Web APIs 编辑

The error event is fired on an Element object when a resource failed to load, or can't be used. For example, if a script has an execution error or an image can't be found or is invalid.

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="img-error" type="button">Generate image 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>

CSS

body {
  display: grid;
  grid-template-areas: "control  log";
}

.controls {
  grid-area: control;
  display: flex;
  align-items: center;
  justify-content: center;
}

.event-log {
  grid-area: log;
}

.event-log-contents {
  resize: none;
}

label, button {
  display: block;
}

button {
  height: 2rem;
  margin: .5rem;
}

img {
  width: 0;
  height: 0;
}

JS

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

const badImg = document.querySelector('.bad-img');
badImg.addEventListener('error', (event) => {
    log.textContent = log.textContent + `${event.type}: Loading image\n`;
    console.log(event)
});

const imgError = document.querySelector('#img-error');
imgError.addEventListener('click', () => {
    badImg.setAttribute('src', 'i-dont-exist');
});

Result

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• This event on Window targets: error event