Validating form field

Validating form field

In client side validation the data is validated in the browser using Java Script before submitting the data to the server.For example, suppose your user submits the form without entering a mandatory field.SSN, date, currency symbol) while semantic validation should enforce correctness of their values in the specific business context (e.g.start date is before end date, price is within expected range).Yet, despite being available in the latest version of all major browsers, constraint validation is a topic largely relegated to presentations and demos.My goal in writing this is to shed some light on the new APIs to help developers make better web forms for everyone.This article will explain some basics about form validation and then illustrate how to validate form fields using j Query.

In the example below, the attribute is added to the input field.Input validation should be applied on both syntactical and semantic level.Syntactic validation should enforce correct syntax of structured fields (e.g.It is always recommended to prevent attacks as early as possible in the processing of the user’s (attacker's) request.Input validation can be used to detect unauthorized input before it is processed by the application.

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In addition to providing instructions, validate user input to help users avoid mistakes.

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