Javascript validating forms php

Note that ARIA is an independent specification that's not specifically related to HTML5.

Client-side form validations help in giving immediate feedback to the user.

This is done by using validation attributes on form elements.

Validation attributes allow you to specify rules for a form input, such as whether a value must be filled in; the minimum and maximum length of the data; whether the data needs to be a number, an email address, or something else; and a pattern that the data must match.

This article leads you through basic concepts and examples about form validation.

For more information beyond this tutorial, see the Constraint validation guide. When you enter data, the web application checks it to see that the data is correct.

If the information is correct, the application allows the data to be submitted to the server and (usually) saved in a database; if the information isn't correct, it gives you an error message explaining what needs to be corrected.

The user can disable Javascript on their server or even auto-bots might try to submit your form as well.Form security (preventing exploits like SQL injection, XSS attacks etc ) are to be handled in addition to form validation.Form validation is focussed towards the user input where as the security validations should be focused on how you use the data.For example, if you have set length limit in the database for a text input, it is better to do the validation before it actually gets cut off by the database system or even getting an error thrown.Often, people confuse form validations with form security.

Leave a Reply