Tutorial on AngularTS

Create the application

Mon, 01 Jan 0001 00:00:00 +0000

Before you start

Use a current Node.js release and an application bundler that supports TypeScript and browser ESM.

Install

npm install @angular-wave/angular.ts

Create the application entrypoint:

import { angular } from '@angular-wave/angular.ts';

export const app = angular.createModule('taskBoard', []);
angular.bootstrap(document, ['taskBoard']);

Create the host page:

<!doctype html>
<html lang="en">
 <body>
 <task-board></task-board>
 <script type="module" src="/src/app.ts"></script>
 </body>
</html>

Checkpoint

Start the development server. The page should load without a bootstrap or missing-module error. The custom element is empty until the next step.

Add a typed view

Mon, 01 Jan 0001 00:00:00 +0000

A typed view constructs real DOM and keeps controller reads reactive. Its main advantage over string templates is type safety between the component model and its bindings.

import { h1, main, p } from '@angular-wave/angular.ts';

class TaskBoard {
 title = 'Task board';
 tasks = [{ id: 1, title: 'Read the guide', done: false }];
}

app.component<TaskBoard>('taskBoard', {
 controller: TaskBoard,
 view: ({ controller }) =>
 main(
 h1(() => controller.title),
 p(() => `${controller.tasks.length} task(s)`),
 ),
});

The view is registered on the normal application module. It does not need a separate mount operation. Functions used as children or property values are reactive readers; plain values render once.

Add reactive state

Mon, 01 Jan 0001 00:00:00 +0000

Add a method to the controller:

class TaskBoard {
 nextId = 2;
 tasks = [{ id: 1, title: 'Read the guide', done: false }];

 add(title: string) {
 this.tasks = [...this.tasks, { id: this.nextId++, title, done: false }];
 }
}

Render the collection with stable keys:

import { each, li, ul } from '@angular-wave/angular.ts';

view: ({ controller }) =>
 ul(
 each(
 () => controller.tasks,
 (task) => task.id,
 (task) => li(() => task().title),
 ),
 ),

The item renderer receives a reader. Call task() inside reactive bindings so a same-key item replacement updates its row.

Checkpoint

Calling controller.add("Ship it") appends one row while retaining the existing row.

Next step

Build the form.

Build the form

Mon, 01 Jan 0001 00:00:00 +0000

Add draft and a submit method:

draft = "";

submit() {
 const title = this.draft.trim();
 if (!title) return;
 this.add(title);
 this.draft = "";
}

Add the form before the list:

import { button, form, input, label } from '@angular-wave/angular.ts';

form(
 {
 onsubmit: (event) => {
 event.preventDefault();
 controller.submit();
 },
 },
 label({ htmlFor: 'new-task' }, 'Task'),
 input({
 id: 'new-task',
 value: () => controller.draft,
 oninput: (event) => {
 controller.draft = (event.currentTarget as HTMLInputElement).value;
 },
 }),
 button({ disabled: () => !controller.draft.trim() }, 'Add'),
);

The callback expresses reactive intent directly. No separate computed wrapper is required.

Checkpoint

The button is disabled for blank input. Submitting valid text adds a row and clears the input.

Add routing and server data

Mon, 01 Jan 0001 00:00:00 +0000

app.router({
 name: 'tasks',
 url: '/tasks',
 component: 'taskBoard',
});

Place the route outlet in the host page:

<main ng-view></main>

Load initial data from a controller method:

loading = true;
error = "";
tasks: Task[] = [];

async onInit() {
 try {
 const response = await fetch("/api/tasks");
 if (!response.ok) throw new Error(`HTTP ${response.status}`);
 this.tasks = await response.json();
 } catch (error) {
 this.error = error instanceof Error ? error.message : "Load failed";
 } finally {
 this.loading = false;
 }
}

Render loading, error, empty, and populated states deliberately. An empty array does not prove loading succeeded.

Checkpoint

Opening /tasks renders the board. A failed request produces a readable error state.

Test the application

Mon, 01 Jan 0001 00:00:00 +0000

Start with a fast controller test:

it('adds a trimmed task', () => {
 const board = new TaskBoard();
 board.draft = ' Write tests ';
 board.submit();

 expect(board.tasks.at(-1)?.title).toBe('Write tests');
 expect(board.draft).toBe('');
});

Then verify the user-visible contract in a browser:

test('adds a task', async ({ page }) => {
 await page.goto('/tasks');
 await page.getByLabel('Task').fill('Write tests');
 await page.getByRole('button', { name: 'Add' }).click();
 await expect(page.getByText('Write tests')).toBeVisible();
});

Test behavior, not internal scope fields or generated DOM comments. Keep network outcomes deterministic.

Checkpoint

Both the model test and browser test pass, including the loading failure case.

Next step

Prepare the application for production.

Prepare production

Mon, 01 Jan 0001 00:00:00 +0000

Before deployment:

Build with production optimization and an intentional source-map policy.
Serve hashed assets with long-lived caching and HTML with revalidation.
Keep API URLs and secrets out of the browser bundle.
Enforce HTTPS and an explicit Content Security Policy.
Exercise loading, empty, error, offline, and slow-network states.
Test keyboard navigation and visible focus.
Record the AngularTS version in the lockfile.
Run type checking, unit tests, browser tests, and integration checks in CI.

Expected result

The application can be deployed repeatedly, reports failures without exposing secrets, and remains usable when requests fail.

Run the complete application

Mon, 01 Jan 0001 00:00:00 +0000

The repository contains a browser-runnable version of the task board:

docs/examples/task-board/task-board.ts is compiled as a package consumer.
docs/static/examples/task-board/task-board-demo.html provides the host page.
docs/static/examples/task-board/task-board.js registers the component view.

Open the task-board example.

The example keeps data local so it runs without a backend. The routing and server-data step shows where application-owned transport behavior belongs.

Compare behavior

Verify that both versions:

Render the initial keyed collection.
Disable submission for blank text.
Trim accepted task titles.
Clear the input after submission.
Preserve existing rows when a task is appended.

CI type-checks the TypeScript application and runs the browser interaction contract. Documentation checks also validate its AngularTS API usage.