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(16 printed pages) Introduction Getting Started Writing the Validation Script Connecting the Form to the Script Associating Form Fields with Custom Script Code Listing Conclusion When you create forms, providing form validation is useful to ensure that your customers enter valid and complete data.For example, you may want to ensure that someone inserts a valid e-mail address into a text box, or perhaps you want to ensure that someone fills in certain 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.In this tutorial I will: Per the spec how errors are presented to the user is left up to the browser itself.However, the spec does provide a full DOM API, new HTML attributes, and CSS hooks authors can use to customize the experience.
Form validation is the process of making sure that data supplied by the user using a form, meets the criteria set for collecting data from the user.
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.
Before HTML5 there was no means of implementing validation natively; therefore, developers have resorted to a variety of Java Script based solutions.
To help ease the burden on developers, HTML5 introduced a concept known as constraint validation - a native means of implementing client side validation on web forms.For example, if you are using a registration form, and you want your user to submit name, email id and address, you must use a code (in Java Script or in any other language) to check whether the user entered a name containing alphabets only, a valid email address and a proper address.