Kód v HTML :
<!DOCTYPE html>
<html><head>
<script type="text/javascript">
checked = false;
function checkedAll ()
{
if (checked == false)
{
checked = true;
}
else
{
checked = false;
}
for (var i = 0; i < document.getElementById('my').elements.length; i++)
{
document.getElementById('my').elements[i].checked = checked;
}
}
</script>
<title>Označiť / odznačiť všetky checkboxy</title>
</head>
<body>
<form id='my' action='/nejakaAkcia' >
<input type='checkbox' name='ch1' value='1'/>Vyber 1<br/>
<input type='checkbox' name='ch2' value='2'/>Vyber 2<br/>
<input type='checkbox' name='ch3' value='3'/>Vyber 3<br/>
<input type='checkbox' name='ch3' value='4'/>Vyber 4<br/>
<br/>
<input type='button' name='CheckAll' value='Check All' onClick='checkedAll();'/>
</form>
</body>
</html>
