Question

Our Company uses a closed sourced shopping cart system for its e-comreace web site. The check out page is generated by a cgi script that I can not modify. I would like to replace the form validation script it generates with my own. The script I am trying to replace is the second script in the document. I have inserted the following script in the footer section:

document.body.getElementsByTagName("SCRIPT")[1].innerHTML = "New Validation Function Here";

however when the validation function is called the old one executes, not my new function.

Where am I going wrong? Is there a better way?

Chris

Answer 1

You don’t need to replace the old SCRIPT tag that was already executed.

The validation function is just a value, and the function name is a variable, so you could just do this:

<script>

oldValidationFunctionName = function(param1, param2, whatever) {
    // the new function body here...
 }

</script>