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How to validate form field before execution of a servlet service method, the form field validation should be like that if anybody enter the extended keyword then it just simply discard it and should throws an exception, does anyone has simple function to enable this please let me know.
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Write a javascript method to validate input fields and call this method based on event of your requirement. You can find numerous methods, tips and tricks and utilities (components and applets) on the Internet for carrying out form validations. You search for one and you will end up with many.
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JavaScript or VB Script can be used to validate at the client side. But VB script supports only IE browsers. If it client side validation do with the javascript if it is serverside validation we can use Filters and do the validations there example login authenticated or not. Validation for the controls is an important factor in web programming. Usually client side scripts are used for the validation at the client's browser. JavaScript is a widely accepted scripting language, which is compatible with all browsers.
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Validations can be performed to detect several different several aspects. Validations can be performed to check for blank fields, it can detect for whether the filled value is a valid data. Simply cut and paste the below code into the <body> section of your page. It contains a form with one box that is checked for "email validity".Say there may be some restrictions on the username and password. Some sites may only allow alphanumeric characters, and only underscore for username, password can contain letters and digits only. So all these checking can be performed with JavaScript.
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