Running code before Submit

Anon

I want to have a form that will alter a hidden field amount when the Submit button is clicked. Only then, do I want this data to be submitted.

In other words, you click submit once and it will submit the form as normal. The only difference is that a hidden field will have a value changed depending upon what is entered in one of the forms Country field.

Thanks,

Jon

Anon

Uh, well, I don't quite see the point of changing the fields value before the user hits submit. This means basically that it's very easy to tamper with (any idiot can disable javascript and give bogus values, remember that.).

Why not submit the form, then in PHP calculate the value?

If you have a good reason for doing this client-side, a hint would be to create a javascript function and launch it with an onClick="" event on the submit button.

andrin

This snippet will set a hidden field and then submit the form:

Between <head> and </head>
---8<-----
<script text="text/javascript" language="JavaScript">
function submitForm(objForm)
{
objForm.nameOfHiddenField.value = 'Whatever you want in that hidden field.';
return true;
}
</script>
---8<-----

In your form:
---8<-----
<form name="nameOfForm" action="actionToBeTaken" method="GET/POST" onsubmit="submitForm(this)">
<input type="hidden" name="nameOfHiddenField" value="" />
---8<-----

Anon

When I click the Submit button, it takes me to a secure server for order processing. I do not have any control over this when it passes the "gateway." So, I have to set the variables before hand.

I'm just trying to find a way that will submit the values without having to have order1.php having to call order2.php and then a submit button. I want to minimise the fuss for the customer.

Or, will I have to have 2 steps to the order and then go to the secure server for credit card details?

Jon