checkbox array validation

anderzreevez · Jul 22, 2004

Hi,

I cannot work out how to validate the checkbox array 'leadcontacts[]' as having any of its array elements containing a check?

Basically there is an ID associated with an array of checkboxes all named leadcontacts[]. However standard javascript validations such as that below cannot accept checkbox ARRAYS?

Any ideas?

Anders

Example function:

<script language="JavaScript">

</script>

kaht · Jul 22, 2004

The problem is in the way that you're accessing the form element. Javascript doesn't know how to accept the array of checkboxes when you define it this way:
document.form1.leadcontacts[].checked

Use this example to give you an idea of how to check the array to see if something's been checked:

Code:

<script language="JavaScript">

function validateForm() {
   obj = document.form1.elements("leadcontacts[]");
   for (i = 0; i < obj.length; i++) {
      if (obj[i].checked) {
         alert("you're fine");
         return true;
      }
   }
   alert("need to check something");
   return false;
}

</script>
<body>
<form name=form1>
<input type=checkbox name="leadcontacts[]">blah1<br>
<input type=checkbox name="leadcontacts[]">blah2<br>
<input type=checkbox name="leadcontacts[]">blah3<br>
<input type=button value='click me' onclick='validateForm()'>
</form>
</body>

-kaht

anderzreevez · Jul 23, 2004

Thanks for that...

If works great if the array has more than 2 elements/value stored within it (i.e the HTML outputs more than 1 checkbox) but when only one is onscreen it fails to do the check and allows the submit to go through without doing the negative alert.

Any ideas?

vbkris · Jul 23, 2004

this will tell u if there is more than one checkbox in a page:
obj = document.form1.elements("leadcontacts[]");
if(obj.length)
{
more than one box
}
else
{
//one box
obj.checked=false
}

Known is handfull, Unknown is worldfull

BillyRayPreachersSon · Jul 23, 2004

Incidentally, you should not be using square brackets as part of your element names:

w3c said:
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").

Hope this helps,
Dan

anderzreevez · Jul 23, 2004

I'm using square brackets so PHP recognise the variable as an array - I know it complicates things!

BillyRayPreachersSon · Jul 23, 2004

Blimey - I wonder how the PHP authors can justify forcing users to break the HTML 4.x standards. That is absolutely shocking!

Dan

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checkbox array validation

anderzreevez

Programmer

kaht

Programmer

anderzreevez

Programmer

vbkris

Programmer

BillyRayPreachersSon

Programmer

anderzreevez

Programmer

BillyRayPreachersSon

Programmer

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