This can be useful to you when deciding on required fields.Apart from ensuring that users provide necessary information, validation has to ensure that users provide information in the correct format.
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The first and most obvious information that should be validated is required information – information without which operation cannot be completed successfully.
Thus, validation has to ensure that the user provided all the necessary details in the web form and it has to fail if at least one of the fields is not provided.
This design pattern is also often called forgiving format UI design pattern.
We’ll discuss some other format techniques later in the article.
You might be interested in the following related posts: User’s input can be validated on the server and on the client (web browser).
Thus we have server-side and client-side validation. In the server-side validation, information is being sent to the server and validated using one of server-side languages.
Validation is being handled in Java Script methods that you create (or within frameworks/plugins) and users get immediate feedback if validation fails.
Main drawback of client-side validation is that it relies on Java Script.
Required fields should be clearly marked in order to inform users about what information has to be provided up front.