How do I check for multple selection of CHECKBOX?

Fendi Baba · Mar 26, 2005

Hi everyone

I wrote an application that generates HTML based on some database
record set. One of the HTML generated is a checkbox with
NAME=StudentID. This is to facilitate user to select this user for
further processing. This also means that ALL student have a checkbox
named StudentID. I do I ensure that only one checkbox is selected at
any time before the user proceed with the processing of the selected
student.

McKirahan · Mar 26, 2005

Fendi Baba said:
Hi everyone

I wrote an application that generates HTML based on some database
record set. One of the HTML generated is a checkbox with
NAME=StudentID. This is to facilitate user to select this user for
further processing. This also means that ALL student have a checkbox
named StudentID. I do I ensure that only one checkbox is selected at
any time before the user proceed with the processing of the selected
student.

Will this help? Watch for word-wrap.

<html>
<head>
<title>boxcheck.htm</title>
<script type="text/javascript">
function boxcheck() {
var boxs = 0;
var form = document.forms[0];
for (var i=0; i<form.elements.length; i++) {
if (form.elements.type == "checkbox") {
if (form.elements.checked) boxs++;
}
}
if (boxs != 1) alert("Check one and only one box.");
}
</script>
</head>
<body>
<form action="" method="get">
<input type="checkbox" name="StudentID" value="1">
<input type="checkbox" name="StudentID" value="2">
<input type="checkbox" name="StudentID" value="3">
<input type="button" value="Click" onclick="boxcheck()">
<input type="reset" value="Clear">
</form>
</body>
</html>

Lachlan Hunt · Mar 26, 2005

Fendi said:
I do I ensure that only one checkbox is selected at
any time before the user proceed with the processing of the selected
student.

Why don't you use radio buttons for that purpose instead? No
client-side scripting would be involved (only server side validation
would still be necessary), and they are designed, so that only one radio
button per group can be selected.

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How do I check for multple selection of CHECKBOX?

Fendi Baba

McKirahan

Lachlan Hunt

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