Javascript & PHP Problem

[Shit4Brains]

I've got a huge problem which i cant seem to get around.

I've got a form which is created dynamically. It only had checkboxes in it, each called check[] so when the form is submitted it sets check as an array. then i can use it in a foreach loop.

But i want the form to only be able to be processed if at least 1 checkbox has been ticked.

So i came up with this javascript:

function anyCheck(form) {
var total = 0;
var max = form.check.length;
for (var idx = 0; idx < max; idx++) {
if (eval("document.search_form.check[" + idx + "].checked") == true) {
    total += 1;
   }
}
if( total == 0 ) {
alert("Please select at least one candidate.");
}
}

But, it only works if the checkboxes are called check not check[]. so without the [] the foreach loop doesnt work.

so can some1 please help.

[findapollo]

could you use javascript to hold an array of which ones are checked? initially just set them all to zero

then put a onchange even in each one
and update that value in the array to one,
then you could check the array for any one's on submit?

just a guess

[batman]

Hey,

See what you get with something like this I found it on the net.

function validate() 
{ 

ischecked=false; 
if (document.title_of_form.name_of_checkbox.checked) {

if (ischecked==false) 
{ 
alert("You must check at least one box"); 
return false; 
}
return true;
} 

<input type="submit" name="submit" value="Submit" onClick="validate()">

Dont know what that will do for you but yo ucan give it a shot. I got it here if you want to take a look.

[usr28]

I am having the same problem. The only way I can see to do this is to use PHP to write the javascript code and use explicit references to the checkboxes instead of using javascript variables.

Name all of your checkboxes like myBoxVariable1, myBoxVariable2, etc. You can use PHP to dynamically create these.

Use this javascript function to convert the myBoxVariable's to something that can be accessed in loops etc. It can be called with onClick="setCheckboxes()" in your html button/link/etc.

Here I uncheck all boxes when the function is called as an example. I used PHP to set the condition on the for loop since javascript will have a hard time counting the boxes with this naming convention and I am dynamically creating them with PHP anyway so I already know how many there are.

function setCheckboxes()
{
var temp;
for (var i = 1; i <= <? echo $NumBoxes; ?>; i++) {
temp=eval("document.myFormName.myBoxVariable" + i);
temp.checked=false;
}
return true;
}

Then in PHP you can take the separate variables and enter them into an array:

$myBoxVariable = array();
for($i=0; $i<$NumBoxes; $i++){
     $temp = "myBoxVariable" . $LogoNum;
     $myBoxVariable[$i] = $_POST[$temp];
}

I searched for hours and this is the only cross-compatible reliable solution. You can use getElementById to refer to check boxes instead but it isn't compatible with all browsers.