If the information is correct, the application allows the data to be submitted to the server and (usually) saved in a database; if the information isn't correct, it gives you an error message explaining what needs to be corrected.
The message is shown to the user when reporting the problem.
We want to make filling out web forms as easy as possible. There are three main reasons: In the real world, developers tend to use a combination of client-side and server-side validation.
One of the features of HTML5 is the ability to validate most user data without relying on scripts.
.[A-Z]/igm //reported to validate incorrectly: [email protected]@ as true /[A-Z0-9._% -] @[A-Z0-9.-] .[A-Z]/igm //current version /^(([^Sam Deering has 15 years of programming and website development experience.
He was a website consultant at Console, ABC News, Flight Centre, Sapient Nitro, and the QLD Government and runs a tech blog with over 1 million views per month.
First, the HTML: attribute to turn off the browser's automatic validation; this lets our script take control over validation.