To validate a javascript form add a javascript function that contains the validation information… Below is an example.

Add this section to the form html page between the header tags (adjust as necessary for your page):

<script language=”JavaScript” type=”text/javascript”>
<!– // function validate(form)
{
if(form.first.value == “”) {
window.alert(“Please make sure the \’ First Name \’ field was properly completed.”);
return false;
}
if(form.last.value == “”) {
window.alert(“Please make sure the \’ Last Name \’ field was properly completed.”);
return false;
}
if(form.phone.value.length < 12) {
window.alert(“Please make sure the \’ Phone \’ field is formated as: 703-555-5555.”);
return false;
}
}

As you can see we are basically looking at a values entered and then comparing them to what we expect to find.

Now we must add the section of code that triggers our function to run.

In the top of the form add this: onsubmit=”return checkform(this);

so your new line would be :

<form method=”POST” action=”submit.asp” name=”form” onsubmit=”return validate(this);”>

This will now call the javascript function when the user clicks the submit button. It will not launch the submit.asp page until the user has passed the validation test.

To test for not a value put an ! infront of the equation to be tested like the example below:

if(!(form.phone.value.length < 12)) { ……

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