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https://github.com/angular/angular
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b8314bd340
This commit introduces an experimental version of a new signal-based forms API for Angular. This new API aims to explore how signals can be leveraged to create a more declarative, intuitive, and reactive way of handling forms. The primary goals of this new signal-based approach are: * **Signal-centric Design:** Place signals at the core of the forms experience, enabling a truly reactive programming model for form state and logic. * **Declarative Logic:** Allow developers to define form behavior, such as validation and conditional fields, declaratively using TypeScript. This moves logic out of the template and into a typed, testable schema. * **Developer-Owned Data Model:** The library does not maintain a copy of data in a form model, but instead read and write it via a developer-provided `WritableSignal`, eliminating the need for applications to synchronize their data with the form system. * **Interoperability:** A key design goal is seamless interoperability with existing reactive forms, allowing for incremental adoption. * **Bridging Template and Reactive Forms:** This exploration hopes to close the gap between template and reactive forms, offering a unified and more powerful approach that combines the best aspects of both. This initial version of the experimental API includes the core building blocks, such as the `form()` function, `Field` and `FieldState` objects, and a `[control]` directive for binding to UI elements. It also introduces a schema-based system for defining validation, conditional logic, and other form behaviors. Note: This is an early, experimental API. It is not yet complete and is subject to change based on feedback and further exploration. Co-authored-by: Kirill Cherkashin <kirts@google.com> Co-authored-by: Alex Rickabaugh <alxhub@users.noreply.github.com> Co-authored-by: Leon Senft <leonsenft@users.noreply.github.com> Co-authored-by: Dylan Hunn <dylhunn@gmail.com> Co-authored-by: Michael Small <michael-small@users.noreply.github.com> PR Close #63408
102 lines
2.4 KiB
TypeScript
102 lines
2.4 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {Injector, signal} from '@angular/core';
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import {TestBed} from '@angular/core/testing';
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import {
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apply,
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applyEach,
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applyWhen,
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customError,
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form,
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requiredError,
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validate,
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} from '../../public_api';
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describe('path', () => {
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describe('Active path', () => {
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it('Disallows using parent paths for applyWhen', () => {
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const data = signal({first: '', needLastName: false, last: ''});
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form(
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data,
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(path) => {
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applyWhen(
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path,
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({value}) => value().needLastName,
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(/* UNUSED */) => {
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expect(() => {
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validate(path.last, ({value}) =>
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value().length > 0 ? undefined : requiredError(),
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);
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}).toThrowError();
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},
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);
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},
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{injector: TestBed.inject(Injector)},
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);
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});
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it('Disallows using parent paths for apply', () => {
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const data = signal({first: '', needLastName: false, last: ''});
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form(
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data,
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(path) => {
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apply(path, () => {
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expect(() => {
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validate(path.last, () => {
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return customError();
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});
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}).toThrowError();
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});
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},
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{injector: TestBed.inject(Injector)},
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);
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});
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it('Disallows using the same path', () => {
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const data = signal({first: '', needLastName: false, last: ''});
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form(
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data,
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(path) => {
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apply(path, () => {
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expect(() => {
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validate(path, () => {
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return customError();
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});
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}).toThrowError();
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});
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},
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{injector: TestBed.inject(Injector)},
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);
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});
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it('Disallows using parent paths for apply', () => {
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const data = signal({
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needLastName: false,
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items: [{first: '', last: ''}],
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});
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form(
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data,
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(path) => {
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applyEach(path.items, () => {
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expect(() => {
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validate(path.needLastName, () => {
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return customError();
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});
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}).toThrowError();
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});
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},
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{injector: TestBed.inject(Injector)},
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);
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});
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});
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});
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