JavaScript Form Validation PDF

JavaScript Form Validation It is important to validate the form submitted by the user because it can have inappropriate values. So, validation is must to authenticate user. JavaScript provides facility to validate the form on the client-side so data processing will be faster than server...

JavaScript Form Validation It is important to validate the form submitted by the user because it can have inappropriate values. So, validation is must to authenticate user. JavaScript provides facility to validate the form on the client-side so data processing will be faster than server-side validation. Most of the web developers prefer JavaScript form validation. Through JavaScript, we can validate name, password, email, date, mobile numbers and more fields. What data should be validated? Form validation is needed anytime you accept data from a user. This may include: – Validating the format of fields such as email address, phone number, zip code, name, password. – Validating mandatory fields – Checking the type of data such as string vs. number for fields such as social security number. – Ensuring that the value entered is a valid value such as country, date, and so on. JavaScript Form Validation Example In this example, we are going to validate the name and password. The name can’t be empty and password can’t be less than 6 characters long. Here, we are validating the form on form submit. The user will not be forwarded to the next page until given values are correct. JavaScript Retype Password Validation JavaScript Number Validation JavaScript email validation We can validate the email by the help of JavaScript. There are many criteria that need to be follow to validate the email id such as – email id must contain the @ and. character – There must be at least one character before and after the @. – There must be at least two characters after. (dot). JavaScript email validation