Element: focus event

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范例
规范
浏览器兼容性
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focus event fires when an element has received focus. The main difference between this event and focusin is that focusin bubbles while focus 不会。

The opposite of focus is blur .

冒泡	No
可取消	No
接口	`FocusEvent`
事件处理程序特性	`onfocus`
Sync / Async	Sync
Composed	Yes

范例

简单范例

HTML

<form id="form">
  <input type="text" placeholder="text input">
  <input type="password" placeholder="password">
</form>

JavaScript

const password = document.querySelector('input[type="password"]');
password.addEventListener('focus', (event) => {
  event.target.style.background = 'pink';
});
password.addEventListener('blur', (event) => {
  event.target.style.background = '';
});

结果

事件委托

There are two ways of implementing event delegation for this event: by using the focusin event, or by setting the useCapture 参数对于 addEventListener() to true .

HTML

<form id="form">
  <input type="text" placeholder="text input">
  <input type="password" placeholder="password">
</form>

JavaScript

const form = document.getElementById('form');
form.addEventListener('focus', (event) => {
  event.target.style.background = 'pink';
}, true);
form.addEventListener('blur', (event) => {
  event.target.style.background = '';
}, true);

结果

规范

规范	状态	注释
UI Events	工作草案	Added info that this event is composed.
DOM (文档对象模型) 3 级事件规范	过时	初始定义

浏览器兼容性

The compatibility table on 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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`focus` event	Chrome 1	Edge 12	Firefox 24 24 不支持 6 — 24 The interface for this event is `事件` , not `FocusEvent` .	IE 9	Opera 11.6	Safari 3.1	WebView Android 1	Chrome Android 18	Firefox Android 24 24 不支持 6 — 24 The interface for this event is `事件` , not `FocusEvent` .	Opera Android 12.1	Safari iOS 2	Samsung Internet Android 1.0

图例

完整支持

另请参阅

相关事件： blur , focusin , focusout
此事件在 Window 目标： focus event

元数据

最后修改： Jul 12, 2020

在此页

范例

简单范例

HTML

JavaScript

结果

事件委托

HTML

JavaScript

结果

规范

浏览器兼容性

图例

另请参阅

相关话题