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README.md
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README.md
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# TypeScript support for Alpine.js
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This package comes with a light TypeScript layer which provides full support for class components in Alpine.js.
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It's used like this:
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**Register a component**
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```ts
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import { DarkModeToggle }
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Alpine.component('DarkModeToggle', DarkModeToggle);
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```
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**Use it the template**
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```html
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<div x-data="Alpine.component('DarkModeToggle')()" x-init="init()">
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<button type="button" @click="switchTheme()">Switch theme</button>
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</div>
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```
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## Installation
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```
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npm install --save-dev github:leanadmin/alpine-typescript
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```
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```ts
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// todo
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```
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## Usage
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You can get a component by calling `Alpine.component('component-name')(arg1, arg2)`. If your component has no arguments, still append the `()` after the call.
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The `component()` call itself returns a function that creates an instance of the component. Invoking the function ensures that the component has a unique instance each time.
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```html
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<div x-data="Alpine.component('DarkModeToggle')()" x-init="init()">
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<button type="button" @click="switchTheme()">Switch theme</button>
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</div>
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```
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```html
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<div x-data="Alpine.component('SearchableSelect')({ options: ['Foo', 'Bar'] })" x-init="init()">
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<div x-spread="options">
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...
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</div>
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</div>
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```
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## Creating components
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To create a component, you need to create the component object and register it using one of the provided helpers.
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Component objects can be:
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- functions returning plain objects
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- classes
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In the context of plain objects, the wrapper function acts as a constructor that can pass initial data to the object.
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## Registering components
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A component can be registered like this:
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```ts
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import { ExampleComponent } from './ExampleComponent';
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import { component } from '@leanadmin/alpine-typescript';
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component('example', ExampleComponent);
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```
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Which will make it accessible using `Alpine.component('example')('foo', 'bar)`.
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**Note: It's better to avoid using `Alpine.component('example', ExampleComponent)`** even if it might work in some cases. The reason for this is that `window.Alpine` might not yet be accessible when you're registering components, and if it is, it's possible that it's already evaluated some of the `x-data` attributes.
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To register multiple components, you can use the `registerComponents()` helper.
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This can pair well with scripts that crawl your e.g. `alpine/` directory to register all components using their file names.
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```ts
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import { registerComponents } from '@leanadmin/alpine-typescript';
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const files = require.context('./', true, /.*.ts/)
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.keys()
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.map(file => file.substr(2, file.length - 5)) // Remove ./ and .ts
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.filter(file => file !== 'index')
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.reduce((files: { [name: string]: Function }, file: string) => {
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files[file] = require(`./${file}.ts`).default;
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return files;
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}, {});
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registerComponents(files);
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```
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## Class components
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You can create class components by extending `AlpineComponent` and exporting the class as `default`.
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The `AlpineComponent` provides IDE support for Alpine's magic properties. This means that you can use `this.$el`, `this.$nextTick(() => this.foo = this.bar)`, and more with full type support.
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```ts
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import { AlpineComponent } from '@leanadmin/alpine-typescript';
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export default class DarkModeToggle extends AlpineComponent {
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public theme: string|null = null;
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/** Used for determining the transition direction. */
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public previousTheme: string|null = null;
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public browserTheme(): string {
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return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
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}
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public switchTheme(theme: string): void {
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this.$nextTick(() => this.previousTheme = this.theme);
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this.theme = theme;
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window.localStorage.setItem('leanTheme', theme);
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this.updateDocumentClass(theme);
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}
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// ...
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public init(): void {
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this.loadStoredTheme();
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this.registerListener();
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}
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}
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```
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## Plain object components
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To register a plain object as an Alpine component, return a function that wraps the object like this:
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```ts
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export default (foo: string, bar: number) => ({
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foo,
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bar,
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someFunction() {
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console.log(this.foo);
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}
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})
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```
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The function will serve as a "constructor" for the object, setting default values and anything else you might need.
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Note that the `=> ({` part is just syntactic sugar, you're free to use `return` if it's useful in your case:
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```ts
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export default (foo: string, bar: number) => {
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return {
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foo,
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bar,
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// ...
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}
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}
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```
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