Input Text required Attribute

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Definition and Usage

required Attribute sets or returns whether the text field must be filled out before submitting the form.

This attribute reflects the HTML required attribute.

See also:

HTML Reference Manual:HTML required 属性

Example

Example 1

Determine whether the text field must be filled out before submitting the form:

var x = document.getElementById("myText").required;

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Example 2

Set the text field as a required part of form submission:

document.getElementById("myText").required = true;

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Syntax

Return the required attribute:

textObject.required

Set the required attribute:

textObject.required = true|false

Attribute value

Value Description
true|false

Specify whether the text field should be a required part of form submission.

  • true - text field is a required part of form submission
  • false - 默认。文本字段不是表单提交的必填部分

技术细节

返回值： 布尔值，如果文本字段是表单提交的必填部分，则返回 true；否则返回 false。

浏览器支持

表中的数字注明了首个完全支持该属性的浏览器版本。

Chrome Edge Firefox Safari Opera
Chrome Edge Firefox Safari Opera
支持 10.0 支持 不支持 支持

HTML DOM Ƙanar Ƙaddaba Ƙasali