Shows you how to write a script that ensures your form is filled in correctly before it's sent to your server.
Great for "required fields" such as email addresses!
If it finds any it sends the page back to the reader who then has to re-enter some data, before submitting again.
A Java Script check is useful because it stops the form from being submitted if there is a problem, saving lots of time for your readers.
It's also very precise, as you can point out the exact field where there's a problem.
Here, we are giving our Java Script codes for validating Login form. By using Field Val UI to build a form and then Field Val to validate the input, you can pass the error straight back into the form.Live demo: Longmuir/pen/Wb Oydx data-validate is injected in all the input fields of your form but when using js Form Validator, you don't require this heavy syntax and the validation will be applied to your form in one shot, without need to touch at your HTML code.Below are the ways to get the value from all types of form elements.In all cases, the form is called That's checking the value's equality with a null String (two single quotes with nothing between them).