HTMLObjectElement.setCustomValidity

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句法
范例
规范
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setCustomValidity() 方法在 HTMLObjectElement interface sets a custom validity message for the element.

句法

HTMLObjectElement.setCustomValidity(message);

参数

error

返回值

undefined

异常

None.

范例

In this example, we pass the ID of an input element, and set different error messages depending on whether the value is missing, too low or too high. Additionally you must call the reportValidity method on the same element or nothing will happen.

function validate(inputID)
{
 var input = document.getElementById(inputID);
 var validityState_object = input.validity;
 if (validityState_object.valueMissing)
 {
  input.setCustomValidity('You gotta fill this out, yo!');
  input.reportValidity();
 }
 else if (input.rangeUnderflow)
 {
  input.setCustomValidity('We need a higher number!');
  input.reportValidity();
 }
 else if (input.rangeOverflow)
 {
  input.setCustomValidity('Thats too high!');
  input.reportValidity();
 }
 else
 {
  input.setCustomValidity('');
  input.reportValidity();
 }
}

It's vital to set the message to an empty string if there are no errors. As long as the error message is not null, the form will not pass validation and will not be submitted.

规范

规范	状态	注释
HTML 实时标准 The definition of 'setCustomValidity' in that specification.	实时标准	初始定义。

浏览器兼容性

The compatibility table in 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
`setCustomValidity`	Chrome Yes	Edge 12	Firefox 1	IE Yes	Opera Yes	Safari 6	WebView Android Yes	Chrome Android Yes	Firefox Android 4	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

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句法

参数

返回值

异常

范例

规范

浏览器兼容性

图例

另请参阅

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