Checking Valid Input?!?

[Anon]

Ok here's a question that I'm hoping someone has an answer for...

I have a page that creates a table DYNAMICALLY based on the contents of a database... The first input field is price, the second is quantiy...

What I want to do is, BEFORE the page gets processed (using the POST method of a FORM) I want to make sure all the Quantity fields have valid input (ie numeric, non-negative).

The problem is the table is Dynamic and may NOT be the same the next time so I obviously can't hard code the page to check the fields for valid inputs....

How can I get around this?

[brandonschnell]

1) use javascript to check the data.

2) don't trust javascript. users can disable it and change your data. verify the data in your php script also before accepting it into the database.