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There are two main methods for validating forms: (usually done using Java Script).

Server-side validation is more secure but often more tricky to code, whereas client-side (Java Script) validation is easier to do and quicker too (the browser doesn't have to connect to the server to validate the form, so the user finds out instantly if they've missed out that required field! In this tutorial we'll build a simple form with client-side Java Script validation.

As a PRO member, you can drag-and-drop upload files here to use as resources.

You can even edit them anytime, like any other code on Code Pen.

In Javascript we create a function which checks if some value is entered in the textbox or selected in the case of combobox, radiobutton, checkbox.

If a textbox is empty or an option is not selected we can use javascript to display an alert message, and highlight the empty field and also we should make sure the page stays the same and doesn’t get “submitted” Javascript validation is a client side validation and relies on the web browser so it should not be solely relied upon Textbox is the simplest element to validate if empty or not.

If no option has been selected, then an alert message will tell the user to select an option and the form will not submit the data until an option has been selected.

Watch the video below and then scroll down to see the sample code.

It's also very precise, as you can point out the exact field where there's a problem.

When you submit a form to a CGI program that resides on the server, it is usually programmed to do its own check for errors.

If it finds any it sends the page back to the reader who then has to re-enter some data, before submitting again.

You can then adapt this form to your own requirements.

Let's build a simple form with a validation script.