Example
Find out if a radio button must be checked before submitting a form:
var x = document.getElementById("myRadio").required;
The result of x will be:
true
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Definition and Usage
The required property sets or returns whether a radio button must be checked before submitting a form.
This property reflects the HTML required attribute.
Browser Support
The required property is supported in all major browsers, except Safari.
Note: The required property is not supported in Internet Explorer 9 and earlier versions.
Syntax
Return the required property:
radioObject.required
Set the required property:
radioObject.required=true|false
Property Values
| Value | Description |
|---|---|
| true|false |
Specifies whether a radio button should be checked before submitting a form
|
Technical Details
| Return Value: | A Boolean, returns true if the radio buton must be checked before submitting a form, otherwise it returns false |
|---|
More Examples
Example
Set a radio button to be a required part of form submission:
document.getElementById("myRadio").required = true;
Try it Yourself »
Related Pages
HTML reference: HTML <input> required attribute
< Input Radio Object