Validating a web form

If you're not careful when applying validation rules to fields in web pages containing multiple forms you may inadvertently add a validation rule to another existing form.

Could you please help me by showing me the best and right approach to validate all the inputs (or data entry) before doing the operation? NET Validation Controls Required Field Validation Control Required Field Validator control , which checks to see if the data is entered for the input control.

Text)) else It works well but I think it is lengthy and it makes confusion and makes the code very difficult to understand.

While this tool is great, it does have limited capability and functionality, so in a future installment of the series, I will demonstrate the use of another client-side validation tool known as the Check Form extension, available for Dreamweaver.

It is a free, downloadable plug-in tool that allows for more advanced client-side validation for web forms.

Form validation is required to prevent web form abuse by malicious users.

Improper validation of form data is one of the main causes of security vulnerabilities.

It exposes your website to attacks such as header injections, cross-site scripting, and SQL injections. For each data type, only a specific set of characters are allowed, and precise validation rules apply.

During form submission, the user will be invited to modify any input fields found to contain invalid data.

If you have never created web forms with validation then I invite you to follow along with this tutorial for creating a simple form that will perform validation of several different text fields and one text area field on a web page.

I am utilizing Dreamweaver and its Validate Form Behavior in my example here; however, any web editing tool can be used to accomplish the same tasks with similar results using the code snippets provided.

Visit the form builder help for guidance on selecting the correct data type for each form input field.

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