backdating letter - Validating form field

Client-side validation alone does not ensure security; therefore data needs to be validated on the server-side as well.Forms frequently include required input that needs to be clearly identified using labels.

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In client side validation the data is validated in the browser using Java Script before submitting the data to the server.

For example, suppose your user submits the form without entering a mandatory field.

In addition to providing instructions, validate user input to help users avoid mistakes.

HTML5 defines a range of built-in functionality to validate common types of input, such as email addresses and dates.

This article will explain some basics about form validation and then illustrate how to validate form fields using j Query.

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