Custom Validators

It’s time to get to the heart of this section, which is writing custom validators. In some cases, you’ll want to create a validator when the validators that come bundled with Angular won’t suffice.

The validator we’ll be creating will check if the passwords from both input fields match. This will be a challenge because validators are typically applied to a single input. We’ll look at how we can use a validator on multiple inputs at the same time.

Here is an overview of the steps we’ll go through to accomplish this:

1. Generate a class for the validator
2. Implement the Validator interface on the class
3. Define a validate method in the class
4. Return either null or an object with the error

We’ll talk more ...