PHP + Javascript

[rolwong]

I would like to send some data from checkbox, so I wrote this:

while($entry = readdir($fp)) {
$fullPath = $currentDir.$entry;
print "<tr>td><input type='checkbox' name='selectedEntry[]' value='".$fullPath."'></td>";
}

I used 'selectedEntry' for my checkbox so that I could some multi data to another php. But the problem is: How could I check if any single checkbox has been checked? I tried to write this in javascript:

<script language='javascript'>
if (myForm.selectedEntry.length == 0) {
alert("You have to select at least one item");
}
</script>

And also how could I make a "Select All"?
I tried to write this:
for (var i=0;i<myForm.selectedEntry.length ; i++) {
myForm.selectedEntry.checked = true;
}

But none of my script work. How can I do these?

Thanks.

[Weedpacket]

Javascript doesn't see an array called selectedEntry. You should look in the form object's array of elements.

http://www.php.net/manual/en/faq.html.php#faq.html.select-multiple

[Roger_Ramjet]

And here's a link for the HTML DOM (document object model I believe that means) which javascript does understand.

DOM Tutorial