What is the main purpose of validating form data? Why perform this on the client side? What types of things do we need to look for?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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What is the main purpose of validating form data? Why perform this on the client side? What types of things do we need to look for? 

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Form level validation is used to ensure all the required form data is filled in and to make sure that any data dependencies between fields are met before the form is submitted.

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