Validating fields in html

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.Before HTML5 there was no means of implementing validation natively; therefore, developers have resorted to a variety of Java Script based solutions.

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We have discussed the following HTML Form Validation topics with examples : Watch Java Script form validation video tutorial.

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.

When you submit a form to a CGI program that resides on the server, it is usually programmed to do its own check for errors.

If it finds any it sends the page back to the reader who then has to re-enter some data, before submitting again.

Form validation provides additional behaviors to programmatically trigger validation for either the form or an individual field, and check validation on the form or individual fields.

Please see the behaviors section for an explanation on syntax.Microsoft® Office Front Page® 2003 allows you to create some custom validation within the form feature.(For more information on how to create form validation using the Front Page form feature, see About creating forms in Front Page 2003.) However, if the form validation provided in Front Page does not suit your needs or the site on which you are working is hosted on a server that does not have Front Page Server Extensions from Microsoft installed, you may need to create custom form validation.We're going to be checking the form using a function, which will be activated by the form's Validating this form would be considerably simpler than one containing radio buttons or select boxes, but any form element can be accessed.Below are the ways to get the value from all types of form elements.Yet, despite being available in the latest version of all major browsers, constraint validation is a topic largely relegated to presentations and demos.