Join Justin Schwartzenberger for an in-depth discussion in this video Validation: built in, part of Angular 2 Essential Training.
- [Instructor] The Angular forms architecture…has support for two approaches to validation.…Build-in validation and custom validation.…You can apply validators…to FormControl objects in your FormGroup…and even to the FormGroup objects.…Let's start by adding some built-in validators to the form.…The built-in validators are available…on the validators class…found in the Angular Form's scoped package.…So in the media-item-form-component.ts file…we add Validators to the import list at the top…and down in the new FormGroup method object…we can set validators on the FormControls.…
Let's add a pattern validator for the name.…We will use a regular expression…that only allows Strings that are alphanumeric.…Letters or numbers.…With support for dashes, spaces and forward slashes.…So anything entered for a mediaItem name…that does not adhere to that…we want to mark as invalid.…So we'll copy that from the sample.txt file…that's inside the project.…So the second parameter option on a new FormControl…is a Validator.…
So we add a call to Validators.pattern…
Justin Schwartzenberger steps through the framework one feature at a time, focusing on the component-based architecture of Angular. Learn what Angular is and what it can do, as Justin builds a full-featured web app from start to finish. After mastering the essentials, you can tackle the other project-based courses in our library and create your own Angular app.
- What is Angular?
- Setting up an Angular template
- Creating a component
- Binding events and properties
- Getting data to components
- Using directives and pipes
- Creating Angular forms
- Validating form data
- Understanding dependency injection
- Providing services
- Making HTTP calls
Skill Level Intermediate
Q: This course was updated on 03/01/2018. What changed?
A: The following topics were updated: directives and pipes, forms, dependency injection and services, HTTP, and routing.
1. Architecture Overview
3. Directives and Pipes
5. Dependency Injection and Services
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