These pages will show how to process PHP forms with security in mind.Proper validation of form data is important to protect your form from hackers and spammers!Building a free form web control is a project for another day. Change this: While you are in there you can remove the Text property.
An important aspect of creating Web Forms pages for user input is to be able to check that the information users enter is valid. NET provides a set of validation controls that provide an easy-to-use but powerful way to check for errors and, if necessary, display messages to the user.
The following topics tell you more about validation controls and how to use them.
The HTML form we will be working at in these chapters, contains various input fields: required and optional text fields, radio buttons, and a submit button: The validation rules for the form above are as follows: This code adds a script tag and an alert command.
And when the page loads, the Java Script code will be executed (the user will see an alert box).
Validators are simple functions (or callables) that take a single argument and raise The previous sections explained how validation works in general for forms.