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This method is secure because it will work even if Java Script is turned off in the browser and it can’t be easily bypassed by malicious users. Ajax calls to the server can validate as you type and provide immediate feedback.
On the other hand, users will have to fill in the information without getting a response until they submit the form. Validation in this context refers to validating rules such as username availability.
The goal of web form validation is to ensure that the user provided necessary and properly formatted information needed to successfully complete an operation.
[Links checked February/10/2017] User’s input can be validated on the server and on the client (web browser).
Please notice that it is often a good idea to not impose a strict input pattern on the users; it’s better to actually permit users to enter text in a variety of formats and syntaxes, and make the application interpret it intelligently.
The user just wants to get something done, not think about “correct” formats and complex UIs.
Ideally, users will fill the web form with necessary information and finish their job successfully. In this article we will go beyond the validation itself and explore different validation and error feedback techniques, methods and approaches.
For better user experience, however, you might consider using client-side validation.
This type of validation is done on the client using script languages such as Java Script.
A common way to mark required fields is with an asterisk (*).
However, not all users know the meaning of an asterisk sign.