nicht angemeldet
So zum Beispiel:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Checkboxen</title>
<script language="JavaScript" type="text/javascript">
<!--
function check (elementID) {
var formID = document.forms["one"];
var count = 0;
var maxNumber = 5;
for (i=0; i<formID.length; i++) {
if (formID.elements[i].type=="checkbox" && formID.elements[i].checked==true && count<=maxNumber) {
count++;
}
}
if (count>maxNumber) {
elementID.checked = false;
alert ("Es dürfen nur maximal "+maxNumber+" Checkboxen ausgwählt werden!");
}
}
//-->
</script>
</head>
<body>
<form name="one" action="something">
<input type="checkbox" onclick="check(this);"><input type="checkbox" onclick="check(this);">
<input type="checkbox" onclick="check(this);"><input type="checkbox" onclick="check(this);">
<input type="checkbox" onclick="check(this);"><input type="checkbox" onclick="check(this);">
<input type="checkbox" onclick="check(this);"><input type="checkbox" onclick="check(this);">
</form>
</body>
</html>
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