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This tutorial will show you how to create a Java Script-enabled form that checks whether a user has filled in the form correctly before it's sent to the server. First we'll explain why form validation is a useful thing, and then build up a simple example form, explaining things as we go along.At the end, there's a little exercise to keep you busy too!
For example, if your form has a box for the user to type their email address, you might want your form handler to check that they've filled in their address before you deal with the rest of the form.
Since we’re only validating that the field has some kind of value, that is all we need to check for.
The reason that the return function is wrapped in another function is to allow for adding more complex logic before the return function if needed. Now if you reload the page you will get the client-side validation we were aiming for, triggered by the submit button.
Required Custom Control Property First a required property has to be added to the reusable Bootstrap Text Field.
This property is needed to indicate that the field is required.
While it might sound weird to validate a hidden field, something a user will never directly interact with, in this age of complex interfaces built in Java Script it’s easy to imagine a scenario where a series of interactions leads to storing some kind of value in a hidden field.