HTML DOM Input Radio checked Property

# Input Radio checked Property

Input Radio Object

## Example

Check and un-check a specific radio button:

function check() {
document.getElementById("red").checked = true;
}
function uncheck() {
document.getElementById("red").checked = false;
}
Try it yourself »

## Definition and Usage

The checked property sets or returns the checked state of a radio button.

This property reflects the HTML checked attribute.

## Browser Support

The checked property is supported in all major browsers.

## Syntax

Return the checked property:

radioObject.checked

Set the checked property:

radioObject.checked=true|false

## Property Values

Value | Description
--- | ---

true|false

Specifies whether a radio button should be checked or not.

- true - The radio button is checked
- false - Default. The radio button is not checked

## Technical Details

Return Value: | A Boolean, returns true if the radio button is checked, and false if the radio button is not checked

## More Examples

## Example

Find out if a radio button is checked or not:

var x = document.getElementById("myRadio").checked;

The result of x will be:

true
Try it yourself »

## Example

Use a radio button to convert text in an input field to uppercase:

document.getElementById("fname").value = document.getElementById("fname").value.toUpperCase();
Try it yourself »

## Example

Several radio buttons in a form:

var coffee = document.forms[0];
var txt = "";
var i;
for (i = 0; i < coffee.length; i++) {
if (coffee[i].checked) {
txt = txt + coffee[i].value + " ";
}
}
document.getElementById("order").value = "You ordered a coffee with: " + txt;
Try it yourself »

## Related Pages

HTML reference: HTML <input> checked attribute

Input Radio Object

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