This will place a green border around the input box.The full code looks like this: The same approach can be used to validate the email address.For example, suppose you wanted to validate a credit card.All credit cards are 16 digits and the 16th digit can be calculated based on the first 15 numbers.Therefore, we'll create CSS classes to represent these possible outcomes.Now that we've created a working form, we need to add some j Query and Java Script to validate fields and change the CSS classes that were created earlier.
We also want to implement real-time validation where the color of the input will change based on the validity of the data that has been entered.
If you validate the form using j Query, you can notice this and alert the user to their mistake instead of submitting the form.
Java Script form validation is a great way to help your users avoid mistakes when filling out a form Alternatively, if you want to protect your server from malicious users, then you should use server side validation because Java Script can be easily bypassed.
If the data is valid the input box should be green.
If the data is invalid, the input box should be red.