Now we will see how we can validate our entered form data before submitting it to the web server.
So, most of the web developers prefer Java Script form validation.Now, when you have finished learning how to validate a sample registration form using Java Script, let us take you to the another way doing the same thing.But this time, the instead of on submitting the form, validations are on field level, i.e. Sure that will be preety interesting to learn and share as well.We would like to hear from you regarding this document.And we welcome any constructive suggestions to improve this example.It sets the focus to the input field until the user supplies a valid value.
When the user does so, they may proceed and can supply value to the next available field.The later Java Script function created is called on the onsubmit event of the form.HTML Code of the Sample Registration Form is the external Java Script file which contains the Java Script ocde used to validate the form. Notice that for validation, the Java Script function containing the code to validate is called on the on Submit event of the form.Constraint validation is an algorithm browsers run natively when a form is submitted to determine its validity.On this approach, we took advantage of the constraint validation API to perform validations.The tutorial explores Java Script validation on submit with detail explanation.