2. informs the user to any possible problems with the data
3. must be indicated
4. Things to consider
4.1. Three things
4.2. Required Fields
4.3. Real-time validation
4.4. Post-back validation
5. The critical point where the website communicates the user requirement and errors in a form
6. helps us to ensure that users fill out forms in the correct format, making sure that submitted data will work successfully with our applications.
7. when you enter data, the web application checks it to see that the data is correct. If correct, the application allows the data to be submitted to the server and (usually) saved in a database; if not, it gives you an error message explaining what corrections need to be made. Form validation can be implemented in a number of different ways.
