In client side validation the data is validated in the browser using Java Script before submitting the data to the server.For example, suppose your user submits the form without entering a mandatory field.This article will explain some basics about form validation and then illustrate how to validate form fields using j Query.There are two types of validation: client side validation and server side validation.This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP. What you'll learn: If you ask users to enter information in a page — for example, into a form — it's important to make sure that the values that they enter are valid.For example, you don't want to process a form that's missing critical information.Therefore, you also have to make sure that the values that users enter can be correctly converted to the appropriate data types.You might also have certain restrictions on the values.
For example, the required validator will add a message "Username cannot be blank." to a model when the Some validators may support additional error messages to more precisely describe different causes of validation failures.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. By validating form responses before accepting them, we can alert users to their errors before they submit the form.In this way, client side form validation can vastly improve the user experience.