Validating a form
This plugin is available through cdnjs, npm, bower and github.If it has not been submitted, skip the validation and display a blank form.However, in the example above, all input fields are optional.This is just a simple and harmless example how the PHP_SELF variable can be exploited.Be aware of that any Java Script code can be added inside the - this would not be executed, because it would be saved as HTML escaped code, like this: <script>location.href(' The code is now safe to be displayed on a page or inside an e-mail.If you want to allow any kind of letters (not only A-Z) you're looking for the letternumeric validator.
Validate qty of checkboxes in a group (same name) have been checked, using min, max or range.
The following form contains some typical validators needed in a registration form.
This j Query plugin has support for a lot more validation functions, you find them all in the menu to the right.
Most often, the purpose of data validation is to ensure correct user input.
Validation can be defined by many different methods, and deployed in many different ways.
The option of using pure HTML, sometimes with a touch of CSS, to complement Java Script form validation was until recently unthinkable.