HTML DOM Radio checked property
Radio Objects Definition and Usage
checked property sets or returns a radio button is selected.
grammar
Setting checked properties:
radioObject.checked=true|false
Returns checked attributes:
radioObject.checked
Browser Support
All major browsers support checked property
Examples
Examples
The following example of a radio button is selected and not selected:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
<script>
function check(){
document.getElementById("red").checked=true
}
function uncheck(){
document.getElementById("red").checked=false
}
</script>
</head>
<body>
<form>
你更喜欢哪种颜色?<br>
<input type="radio" name="colors" id="red">红色<br>
<input type="radio" name="colors" id="blue">蓝色<br>
<input type="radio" name="colors" id="green">绿色
</form>
<button type="button" onclick="check()">选择 "红色"</button>
<button type="button" onclick="uncheck()">不选择 "红色"</button>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
<script>
function check(){
document.getElementById("red").checked=true
}
function uncheck(){
document.getElementById("red").checked=false
}
</script>
</head>
<body>
<form>
你更喜欢哪种颜色?<br>
<input type="radio" name="colors" id="red">红色<br>
<input type="radio" name="colors" id="blue">蓝色<br>
<input type="radio" name="colors" id="green">绿色
</form>
<button type="button" onclick="check()">选择 "红色"</button>
<button type="button" onclick="uncheck()">不选择 "红色"</button>
</body>
</html>
try it"
Radio Objects