i have created a check box dynamicaly want to validate the checkbox before submiting form

A checkbox will be created according to the query. I want to validate the checkbox before submitting the form.

I have used that check all开发者_Go百科 and uncheck all using javascript so I used the attribute id in an array:

 <input type="checkbox" name="playlist[]" id="playlist" value="<?php echo $filmpath; ?>"/>

I used the validation code as

 //enter code here
 function chkvalidate()
 {
   //enter code here
   if ( document.modifyform.playlist.checked == false )
   {
     //enter code here
     alert( "Please check the Terms & Conditions box." );
     //enter code here
     valid = false;
     //enter code here
   }
 }

This code is not working.

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Are you using the correct capitalisation in your code? JavaScript is case sensitive, and I believe that if you change modifyform to modifyForm your code will likely execute properly.

That being said, it is a good idea to use camelCase as a naming convention for your variable and function names. It is not required, but it makes for more consistent and easier to read code. Additionally, since any respectable third party library will be using camelCase, it will make it much easier for yourself if you use that convention as well, otherwise you will have multiple naming conventions throughout your source code, and that is simply not maintainable.

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You need document.forms.modifyform.playlist.checked instead to access the form (by name or id) in the DOM. With your existing code, Javascript is trying to access a property called modifyform on the document object, which does not exist.

For reference, documentation.form shows the list of properties you can call on the form object.