Hola
ken-obi y
dogduck
Probar este código:
Código PHP:
<html>
<head>
<script type="text/javascript">
maxi = 3;
function maximo(obj) {
if (!obj.checked) return;
num = 0;
for (i=0; ele=obj.form.elements[i]; i++)
if (ele.type=='checkbox' && ele.checked) num++;
if (num>maxi) {
alert('Tas pasao tío');
obj.checked=false;
}
}
</script>
</head>
<body>
<form>
<p><input type="checkbox" name="C1" value="ON" onclick="maximo(this)">checkbox1</p>
<p><input type="checkbox" name="C2" value="ON" onclick="maximo(this)">checkbox2</p>
<p><input type="checkbox" name="C3" value="ON" onclick="maximo(this)">checkbox3</p>
<p><input type="checkbox" name="C4" value="ON" onclick="maximo(this)">checkbox4</p>
<p><input type="checkbox" name="C5" value="ON" onclick="maximo(this)">checkbox5</p>
</form>
</body>
</html>
Saludos,
