Form validation can be implemented in a number of different ways.
The truth is that none of us filling in forms — there is a lot of evidence to show that users get annoyed by forms, and are one of main things that will cause them to leave and go somewhere else if they are done badly. We want to make filling out web forms as non-horrible as possible, so why do we insist on blocking our users at every turn?
Let's build a simple form with a validation script.
To check, whether the user entered correct form of data, it’s must to apply form validation in any of the form. The expression is: /^[a-z A-Z] $/ The above expression checks whether the input characters in the string is alphabet or not.
Plus, learn how to email form data and save it in a My SQL database so that it's ready for other applications.
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.
By using Field Val UI to build a form and then Field Val to validate the input, you can pass the error straight back into the form.
Checking for form completion: The first step of form validation is to check, whether the user have entered information in all the fields or not.Great for "required fields" such as email addresses!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.At the end, there's a little exercise to keep you busy too!Form validation is the process of checking that a form has been filled in correctly before it is processed.We also want to help our users to fill out our forms correctly and don't get frustrated when trying to use our apps.