HTML DOM Radio defaultChecked property
Radio Objects Definition and Usage
defaultChecked property returns the default value for the property checked.
If the default radio button is selected, it returns true, otherwise fasle.
grammar
radioObject.defaultChecked
Browser Support
All major browsers support defaultChecked property
Examples
Examples
Detection "Blue" option is selected by default:
<! DOCTYPE html>
<Html>
<Head>
<Meta charset = "utf-8">
<Title> This tutorial (w3big.com) </ title>
<Script>
function displayResult () {
var x = document.getElementById ( "blue") defaultChecked.;
alert (x);
}
</ Script>
</ Head>
<Body>
<Form>
Which color do you prefer? <br>
<Input type = "radio" name = "colors" id = "red"> red <br>
<Input type = "radio" name = "colors" id = "blue" checked = "checked"> Blue <br>
<Input type = "radio" name = "colors" id = "green"> green
</ Form>
<Button type = "button" onclick = "displayResult ()"> select the default blue it? </ Button>
</ Body>
</ Html>
<Html>
<Head>
<Meta charset = "utf-8">
<Title> This tutorial (w3big.com) </ title>
<Script>
function displayResult () {
var x = document.getElementById ( "blue") defaultChecked.;
alert (x);
}
</ Script>
</ Head>
<Body>
<Form>
Which color do you prefer? <br>
<Input type = "radio" name = "colors" id = "red"> red <br>
<Input type = "radio" name = "colors" id = "blue" checked = "checked"> Blue <br>
<Input type = "radio" name = "colors" id = "green"> green
</ Form>
<Button type = "button" onclick = "displayResult ()"> select the default blue it? </ Button>
</ Body>
</ Html>
try it"
Radio Objects