JavaScript Form Validation
JavaScript provides a way to validate form data on the client’s computer before sending it to the web server. Form validation generally performs two functions.
- Basic Validation − First, the form must be checked to ensure all the mandatory fields are filled in. It would require just a loop through each field in the form and a check for data.
- Data Format Validation − Secondly, the data that is entered must be checked for correct form and value. Your code must include appropriate logic to test the correctness of data.
