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Javascript, however, is as powerful as any client-side language comes, and text field validation is a tremendously desired capability many webmasters want for their forms, and without server-side languages (or at least knowledge of them), Javascript is relied upon very heavily.Javascript allows for a couple different calls to document forms, either by the name or by the position of the form within the document relative to other forms, beginning at 0.It makes your page much more user-friendly, and takes out the frustration of having to fill out the same form repeatedly.

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This tutorial will show you how to create a Java Script-enabled form that checks whether a user has filled in the form correctly before it's sent to the server. First we'll explain why form validation is a useful thing, and then build up a simple example form, explaining things as we go along.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 don't get frustrated when trying to use our apps.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.