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…
Author
Justin Schwartzenberger
Updated
3/1/2018Released
10/31/2016Justin 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
- Routing
Skill Level Intermediate
Duration
Views
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.
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Introduction
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Welcome1m 27s
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Why use AngularJS 2?1m 36s
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Using the exercise files1m 51s
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Basics of TypeScript2m 24s
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Course overview1m 2s
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1. Architecture Overview
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Directives and pipes1m 40s
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Data binding1m 53s
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Dependency injection1m 54s
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Data persistence1m 47s
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Routing1m 50s
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2. Components
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NgModule and the root module5m 59s
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Component metadata2m 4s
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The component selector2m 12s
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The component template2m 59s
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Styling a component5m 3s
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Property binding2m 30s
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3. Directives and Pipes
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Structural directives: ngFor3m 34s
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Attribute directives: custom3m 53s
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Using directive values3m 36s
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Angular pipes: built in3m 1s
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Angular pipes: custom4m 28s
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4. Forms
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Angular forms1m 29s
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Template-driven forms4m 45s
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Model-driven forms4m 19s
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Validation: built in3m 28s
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Validation: custom3m 2s
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Error handling Updated5m 10s
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5. Dependency Injection and Services
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Services in Angular2m 22s
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Class constructor injection2m 39s
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The Inject decorator3m 40s
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Injection token Updated3m 36s
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6. HTTP
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7. Routing
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Router links2m 36s
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Conclusion
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Next steps1m 20s
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Video: Validation: built in