Introduction to Forms in Angular: Template-Driven Forms
Mar 09, 2025 am 12:18 AM
Forms are essential in modern front-end applications, handling user interactions daily, from logins and searches to bookings and to-do lists. While some forms are simple, others can be complex, spanning multiple pages. This tutorial explores Angular's template-driven forms approach for building them. Regardless of your chosen method, a robust form library should provide:
- Two-way data binding: Keeps input values synchronized with component state.
- Form state tracking: Visually indicates form validity (e.g., using red borders for errors).
- Error handling: Clearly displays validation errors.
- Conditional enabling/disabling: Controls form sections based on validation.
Angular's Form Strategies
Angular offers two powerful form-building strategies: template-driven forms and model-driven (reactive) forms. Both utilize the FormsModule.
Building a Signup Form: A Step-by-Step Guide
This example demonstrates a simple signup form using template-driven forms.
-
User Model: Define a
Userclass (or interface) to represent form data:export class User { constructor( public id: number, public email: string, public pwd: string, public confirmPwd: string, public gender: string, public terms: boolean ) { } } -
Component Setup: Create the necessary components and layout for the signup form.
-
Two-Way Binding with
ngModel: UsengModelfor two-way data binding between the form inputs and theUserobject in your component. -
Form Submission: Handle form submission using the
(ngSubmit)event. -
Component Logic: In your component's TypeScript file, handle form submission:
onSubmit({ value, valid }: NgForm) { console.log(this.user.email); console.log("valid: " + valid); } -
Complete Example: A complete, runnable example is available on GitHub (link omitted for brevity). This example includes styling using Bootstrap.
Conclusion
This tutorial covers template-driven forms in Angular. While simple and easy to use for smaller forms, this approach can become less manageable for complex forms. The next tutorial will explore model-driven forms as a more scalable alternative.
This post incorporates contributions from Esther Vaati, a software developer and writer for Envato Tuts .
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