Validating on submit

Posted by / 21-Apr-2020 23:05

Validating on submit

This function either returns nothing when everything is ok or an object stating what went wrong.A very common use case of a custom validator is to check wether the form matches the sanitization rules of the server, this means the validator checks if the characters your user puts into your form are allowed.

Note Important Validating user input is also important for security.If a form is long or complex, reporting errors only after the page is submitted can be inconvenient to the user.You can add support to perform validation in client script.When you restrict the values that users can enter in forms, you reduce the chance that someone can enter a value that can compromise the security of your site.To see how validation works, run this page and deliberately make mistakes.

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Chances are likely that the above validators will not be able to match the requirements of your server.