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The truth is that none of us filling in forms — there is a lot of evidence to show that users get annoyed by forms, and are one of main things that will cause them to leave and go somewhere else if they are done badly. We want to make filling out web forms as non-horrible as possible, so why do we insist on blocking our users at every turn?There are three main reasons: In the real world, developers tend to use a combination of client-side and server-side validation, to be on the safe side.You can then adapt this form to your own requirements.Let's build a simple form with a validation script.You have already learned a lot about these property settings in previous chapters, and you will learn more in Chapter 5, "Form Data." But this chapter focuses on setting and getting these property values at runtime through scripting.Scripting gives you full control over your form's functionality at runtime.Shows you how to write a script that ensures your form is filled in correctly before it's sent to your server.
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.Through scripting you have the power to manipulate your form's interactive controls to provide your users with a richer and more intuitive experience.Designer scripting is similar to HTML scripting in the following ways: If you are familiar with scripting on the Web or another platform, you will find the scripting concepts in Designer to be very familiar. You can achieve a great deal of functionality and customization without scripting.And you can set most of the important property values of your form objects at design time by using Designer's palettes.It makes your page much more user-friendly, and takes out the frustration of having to fill out the same form repeatedly.It's also very precise, as you can point out the exact field where there's a problem.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.If so, it allows it to be submitted to the server and (usually) saved in a database; if not, it gives you error messages to explain what you've done wrong (provided you've done it right).form validation can be implemented in a number of different ways.