GlobalEventHandlers.onfocus

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句法
范例
规范
浏览器兼容性
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onfocus 特性为 GlobalEventHandlers 混合 EventHandler 处理 focus events on the given element.

focus event is raised when the user sets focus on an element.

For onfocus to fire on non-input elements, they must be given the tabindex attribute (see Building keyboard accessibility back in 了解更多细节)。

注意： The opposite of onfocus is onblur .

句法

target.onfocus = functionRef;

值

functionRef is a function name or a 函数表达式 . The function receives a FocusEvent object as its sole argument.

范例

此范例使用 onblur and onfocus to change the text within an <input> 元素。

HTML

<input type="text" value="CLICK HERE">

JavaScript

let input = document.querySelector('input');
input.onblur = inputBlur;
input.onfocus = inputFocus;
function inputBlur() {
  input.value = 'Focus has been lost';
}
function inputFocus() {
  input.value = 'Focus is here';
}

结果

Try clicking in and out of the form field, and watch its contents change accordingly.

规范

规范	状态	注释
HTML 实时标准 The definition of 'onfocus' in that specification.	实时标准

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
`onfocus`	Chrome Yes	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持

In contrast to IE, in which almost all kinds of elements receive the focus event, almost all kinds of elements on Gecko browsers do NOT work with this event.

另请参阅

focus event
Related event handler: GlobalEventHandlers.onblur

元数据

最后修改： 2019 年 3 月 23 日

在此页

句法

值

范例

HTML

JavaScript

结果

规范

浏览器兼容性

图例

另请参阅

相关话题