One of the features of HTML5 is the ability to validate most user data without relying on scripts.This is done using validation attributes on form elements, which allow you to specify rules for a form input like whether a value needs to be filled in, the minimum and maximum length of the data, whether it needs to be a number, an email address, etc., and a pattern that it must match.
Form validation can be implemented in a number of different ways.
Form validation normally used to occur at the server, after the client had entered all the necessary data and then pressed the Submit button.
If the data entered by a client was incorrect or was simply missing, the server would have to send all the data back to the client and request that the form be resubmitted with correct information.
This is building on my previous post on how to use regular expressions with j Query. Update 12/05/13: Separated into versions for testing.
//reported to validate incorrectly: [email protected] as true /[A-Z0-9._% -] @[A-Z0-9-] .
In the above form, we are calling validate() to validate data when onsubmit event is occurring.
The following code shows the implementation of this validate() function.Form validation helps us achieve these goals — this article tells you what you need to know.This is called form validation — when you enter data the web application checks it to see if it is correct.Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format we need to process it successfully, and that it won't break our applications.We also want to help our users to fill out our forms correctly and not get frustrated when trying to use our apps.Note that ARIA is an independent specification that's not specifically related to HTML5.