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Validating input in javascript

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The script has a catalog of almost all the common validation types built-in.

The idea is to create a set of “validation descriptors” associated with each element in a form.

An email address must contain at least a ‘@’ sign and a dot (.).

Also, the ‘@’ must not be the first character of the email address, and the last dot must at least be one character after the ‘@’ sign.

For an alternative approach to client-side form validation, without Java Script, check out our new article on HTML5 Form Validation which is available now in most modern browsers.

When form input is important, it should always be verified using a secure server-side script.

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.

For example, you may want to ensure that someone inserts a valid e-mail address into a text box, or perhaps you want to ensure that someone fills in certain fields.This was really a lengthy process which used to put a lot of burden on the server.Java Script provides a way to validate form's data on the client's computer before sending it to the web server. First let us see how to do a basic form validation.In other words if the first condition fails, the second condition will not be tested and so forth.Only when all conditions have been satisfied do we reach the command, in which case the form will be submitted.Now we will see how we can validate our entered form data before submitting it to the web server.