Chapter 6. Data Validation
In this chapter, we will cover the following recipes:
- Validating text by length
- Validating numbers by range
- Using the built-in pattern validation
- Advanced use of built-in constraints and custom validations
- Calculating password strength
- Validating US zip codes
- Using asynchronous server-side validation
- Combining client-side and server-side validation
Introduction
Forms usually expect the user to behave in a certain way and to insert data as requested. This is where data validations come in. Server-side validation is always a must to do and form validation at the client side should be considered.
Validation makes the application user-friendly, saves time and bandwidth. Client-side and server-side validation complement each other and ...
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