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HTML DOM Input Number required properties

Input Number Object Reference Input Number Object

Examples

Check number field before submitting the form if required fields:

var x = document.getElementById("myNumber").required;
x The output is:
true

try it"

Definition and Usage

required property sets or returns the number of fields in the form if a required field.

This property reflects the HTML required attributes.

Browser Support

Internet ExplorerFirefoxOperaGoogle ChromeSafari

All major browsers support attribute value.

Note: Internet Explorer 9 and earlier versions of IE do not support the use of type = "number" <input> element attributes.

grammar

Returns required attributes:

numberObject .required

Set the required properties:

numberObject .required=true|false

Property Value

值 描述
true|false 描述了 number 字段在表单提交前是否为必填部分。
  • true - number 字段为表单的必填部分
  • false - 默认。 number 字段为表单的选填部分

technical details

return value: Boolean field is required if the number of the form back to true, otherwise false.

More examples

Examples

Setting number field of the form required parts:

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

try it"

Related Pages

HTML Reference Manual: HTML <the INPUT> required Attribute

Input Number Object Reference Input Number Object