php arrays and javascript verification

[Anon]

I have a group of checkboxes named 'preferredphase[]' to pass them as an array to php. However I need to verify at least one checkbox is selected before the form can be submitted.

This is the code I have, but I keeps getting stuck on 'false' and giving me the alert.

Any ideas?

var checkSelected = false;
for (i = 0;  i < form.elements['preferredphase[]'];  i++)
{
if (form.elements['preferredphase[]',i].checked)
checkSelected = true;
}
if (!checkSelected)
{
alert("Please select at least one preferred phase");
return false
}

[amcgrath]

If (!count(preferredphase)) {
// they didnt select anything
} else {
// do your thing
}

[Anon]

still can't get this to work.

anyone got the full code of where this has been used?

it seems most people have used the 'elements' identifier in javascript to sort it out as the [] in the php array confuse the javascript.

[Anon]

Wow, done the bastard:

This takes the array of checkboxes with the crazy php name with square brackets, checks them all to see if at least one is selected and gives an alert if one isn.t

// require that at least one checkbox be checked
var checkSelected = false;
for (i = 0; i < form.elements['chosensubject[]'].length; i++)
{
if (form.elements['chosensubject[]'].checked)
checkSelected = true;
}
if (!checkSelected)
{
alert("Please select at least one chosen subject");
return false
}