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Radio checked Property

Radio Object Reference 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
  }

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Definition and Usage

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


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

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:

false

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Example

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

document.getElementById("fname").value=document.getElementById("fname").value.toUpperCase();

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Example

Several radio buttons in a form:

var coffee = document.forms[0].coffee;
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;

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Related Pages

HTML reference: HTML <input> checked attribute


Radio Object Reference Radio Object

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