Window: error event

Baseline Widely available

This feature is well established and works across many devices and browser versions. Itâs been available across browsers since â¨2015å¹´7æâ©.

Bubblesï¼æ¯æåæ³¡ï¼	No
Cancelableï¼å¯æ¤éï¼	No
Interfaceï¼æ¥å£ï¼	`Event` or `UIEvent`
Event handler propertyï¼äºä»¶å¤çç¨åºå±æ§ï¼	`onerror`

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HTML

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>

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: 0.5rem;
}

img {
  width: 0;
  height: 0;
}

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);
});