HTML DOM checked Property
 Complete Checkbox Object Reference
Definition and Usage
The checked property sets or returns whether or not a checkbox should be
checked.
Syntax
checkboxObject.checked=true|false
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Example
<html>
<head>
<script type="text/javascript">
function check()
{
document.getElementById("check1").checked=true
}
function uncheck()
{
document.getElementById("check1").checked=false
}
</script>
</head>
<body>
<form>
<input type="checkbox" id="check1" />
<input type="button" onclick="check()"
value="Check Checkbox" />
<input type="button" onclick="uncheck()"
value="Uncheck Checkbox" />
</form>
</body>
</html>
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Try-It-Yourself Demos
Check and uncheck a checkbox
Several
checkboxes in a form
Checkbox -
Convert text to uppercase
Complete Checkbox Object Reference
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