Simple validating contact form
If the user has Java Script disabled, PHP validation will kick in when the form is submitted, and the user will be redirected back to the Form with messages about their missing fields.In the first part of this series I introduced various forms of validation including some best practices, the difference between client-side and server-side validation, the types of validation including separation and indications for required fields, correct format, and confirmation fields.Server-side validation incorporates code validation into a form handler. NET application on the server that provides the functionality that your form needs for processing after a customer has submitted it.Because the code is stored on the server, server-side validation requires a roundtrip to the server.Hopefully these behaviours will converge in future releases.For these examples we have created our own valid/invalid CSS formatting to override the browser default. That's why you may see something like the following: Before you type anything into the box a red marker is shown.
Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.
The simplest change you can make to your forms is to mark a text input field as 'required': This informs the (HTML5-aware) web browser that the field is to be considered mandatory.
Different browsers may mark the input box in some way (Firefox 4 Beta adds a red box-shadow by default), display a warning (Opera) or even prevent the form from being submitted if this field has no value.
Note Front Page Server Extensions are a set of programs that provide access to special Front Page features, such as database processing, form processing, hit counters, and other built-in Front Page components that require server-side processing.
You can provide custom validation for your forms in two ways: server-side validation and client-side validation.