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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.

If you validate the form using j Query, you can notice this and alert the user to their mistake instead of submitting the form.

validating contact form-11

It’s no surprise even if the same contact form doesn’t work in a different environment.

How do you know that your host won’t change their mail delivery policy tomorrow morning? For example, if a mail had “@yahoo.com” in the From field, but was actually sent from your web server (it’s not yahoo.com), it would be highly possible that relaying mail servers consider it as a spoofed address.

For example, suppose you wanted to validate a credit card.

All credit cards are 16 digits and the 16th digit can be calculated based on the first 15 numbers.

If you are using a My SQL database, this is called My SQL Injection.

To avoid this problem, you must validate form submissions using your server.You cannot rely on Java Script to avoid this security problem. You can also download this demo and check out the source as we go through this tutorial.Download Demo Source Our form contains two types of validation. Valid inputs will turn green while invalid inputs will turn red.To get started, we'll create an HTML page that include a form with the id "contact". It should contain an label, an input (or textarea), and a span that will contain the error message.The form in HTML will look like this: tag improves usability.This means you can use Java Script to check for, and alert the user to, credit card typos.

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