Make sure checkbox is checked, then submit

@james_cwyJan 27.2004

while (…….)
<input type=”checkbox” name=”del[]” value='<?php echo $IPAddress;?>’><?php echo $IPAddress;?><p>
}

I have this loop to create the number of check boxes based on number of records from db.

What I would like is this: If no checkboxes are sellected, prompt
else if there is then only submit.

How can I do this? I am new at javascripts, hope someone can help

Thanks
James

to post a comment

@PittimannJan 27.2004 — #Hi!

First of all: please do not use the '[]' in the names of your checkboxes!!

Another thing: you could give them unique names in your loop, which would make it easier to identify them in the script receiving the form data.

As far as the rest is concerned, here's some code:

The code from the top until the closing head tag:

[code=php]
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
 <title>Untitled</title>
 <script language="JavaScript" type="text/javascript">
 <!--
 var checked;
 function checkForm(){
 checked=0;
 for (var i = 0; i < document.forms[0].elements.length; i++){
 if (document.forms[0].elements[i].type=="checkbox"){
 if (document.forms[0].elements[i].checked==true){
 checked++;
 }
 }
 }
 if (checked==0){
 alert('Please check at least one checkbox!');
 return false;
 }
 else{
 return true
 }
 }
 //-->
 </script>
 </head>
 [/code]

The rest:

[code=php]
 <body>
 <form action="myAction.php" name="myForm" method="post" onSubmit="return checkForm()">
 
 <!-- begin while stuff... -->
 <input type="checkbox" name="del" value='<?php echo $IPAddress;?>'><?php echo $IPAddress;?><p> 
 <!-- end while stuff... -->
 
 <input type="submit" value="blah">
 </form>
 </body>
 </html>
 [/code]

Cheers - Pit

@james_cwyauthorJan 28.2004 — #Thanks for the hellp.Really appreciate it.

@crh3675Jan 28.2004 — #[B]Pittman:[/B]

[i]Originally posted by Pittimann [/i]

[B]Hi!

First of all: please do not use the '[]' in the names of your checkboxes!!

[/QUOTE]

What if the user is passing an array of elements? It is the only way for me to get the data for <select multiple> boxes. I sometimes need to use the PHP constructor "[]" to pass the values as an array.

@PittimannJan 28.2004 — #Hi!

You're welcome, james_cwy!

To crh3675: if you use [] in the names of form elements and try to reference these elements by name in js, you will get errors (document.blah...[] is null or not an object) and the script wont work.

Originally posted by crh3675:What if the user is passing an array of elements? It is the only way for me to get the data for <select multiple> boxes. I sometimes need to use the PHP constructor "[]" to pass the values as an array.[/QUOTE]It is not the only way and it is not necessary to use the PHP constructor "[]" to pass the values as an array.

You can easily deal with that in a different way as far as your PHP is concerned, but - talking about js - the [] will "kill" your script if you do a reference by names...

Cheers - Pit

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