Download Demo Source Our form contains two types of validation. Valid inputs will turn green while invalid inputs will turn red.
When the submit button is pushed, j Query will check whether all fields are valid.
To avoid this problem, you must validate form submissions using your server.
You cannot rely on Java Script to avoid this security problem. You can also download this demo and check out the source as we go through this tutorial.
Most of the web developers prefer Java Script form validation.
If any fields are not valid, the form will not be submitted and the user will be informed with error messages for the fields that are causing problems.
To get started, we'll create an HTML page that include a form with the id "contact". It should contain an label, an input (or textarea), and a span that will contain the error message.
However, to see whether a credit card has sufficient funds requires communicating with the credit card company and that can only be done using a server side programming language.
Similarly, form data is typically saved in a database on the server.
We apply a little CSS to align the labels and space out the fields: The error messages should only be shown when a field has been entered incorrectly. After the form is submitted, we can reveal the error message by changing the class name with Java Script.