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[examples] Add async task playground example #1179
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12 changes: 7 additions & 5 deletions
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packages/lit-dev-content/samples/examples/async-task/index.html
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,7 +1,9 @@ | ||
| <!doctype html> | ||
| <head> | ||
| <script type="module" src="./index.js"></script> | ||
| </head> | ||
| <style> | ||
| body { font-family: sans-serif; } | ||
| </style> | ||
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| <script type="module" src="./npm-info.js"></script> | ||
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| <body> | ||
| <demo-element></demo-element> | ||
| <npm-info></npm-info> | ||
| </body> |
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packages/lit-dev-content/samples/examples/async-task/index.js
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packages/lit-dev-content/samples/examples/async-task/npm-info.js
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packages/lit-dev-content/samples/examples/async-task/npm-info.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| import {LitElement, css, html} from 'lit'; | ||
| import {customElement, state} from 'lit/decorators.js'; | ||
| import {Task} from '@lit-labs/task'; | ||
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| @customElement('npm-info') | ||
| export class NpmInfo extends LitElement { | ||
| @state() | ||
| _package = 'lit'; | ||
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| _fetchNpmInfoTask = new Task(this, { | ||
| task: async ([pkgName], {signal}) => { | ||
| if (pkgName === undefined || pkgName === '') { | ||
| throw new Error('Empty package name'); | ||
| } | ||
| // Artifical delay for demo purposes | ||
| await new Promise((r) => setTimeout(r, 1000)); | ||
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| const response = await fetch(getPackageUrl(pkgName), {signal}); | ||
| if (response.status === 200) { | ||
| return response.json() as Promise<NpmPackage>; | ||
| } else { | ||
| throw response.text(); | ||
| } | ||
| }, | ||
| args: () => [this._package], | ||
| }); | ||
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| _onChange(e: Event) { | ||
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| this._package = (e.target as HTMLInputElement).value; | ||
| } | ||
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| render() { | ||
| return html` | ||
| <header> | ||
| <h1>${this._package}</h1> | ||
| <a>${npmLogo}</a> | ||
| </header> | ||
| <label> | ||
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| Enter a package name: | ||
| <input .value=${this._package} @change=${this._onChange} /> | ||
| </label> | ||
| <div> | ||
| ${this._fetchNpmInfoTask.render({ | ||
| pending: () => 'Loading...', | ||
| complete: (pkg) => html` | ||
| <h3>${pkg.description}</h3> | ||
| <h4>dist-tags:</h4> | ||
| <ul> | ||
| ${Array.from(Object.entries(pkg['dist-tags'])).map( | ||
| ([tag, version]) => html`<li><pre>${tag}: ${version}</pre></li>` | ||
| )} | ||
| </ul> | ||
| `, | ||
| error: (e) => `Error ${(e as Error).message}`, | ||
| })} | ||
| </div> | ||
| `; | ||
| } | ||
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| static styles = css` | ||
| :host { | ||
| display: block; | ||
| min-width: 300px; | ||
| border-radius: 5px; | ||
| border: solid 1px #aaa; | ||
| padding: 20px; | ||
| } | ||
| header { | ||
| display: flex; | ||
| flex-direction: row; | ||
| align-items: center; | ||
| justify-content: space-between; | ||
| } | ||
| #logo { | ||
| height: 38px; | ||
| width: auto; | ||
| } | ||
| `; | ||
| } | ||
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| const getPackageUrl = (name: string) => `https://registry.npmjs.org/${name}`; | ||
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| const npmLogo = html` | ||
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| <svg | ||
| id="logo" | ||
| version="1.1" | ||
| xmlns="http://www.w3.org/2000/svg" | ||
| x="0px" | ||
| y="0px" | ||
| width="540px" | ||
| height="210px" | ||
| viewBox="0 0 18 7" | ||
| > | ||
| <path | ||
| fill="#CB3837" | ||
| d="M0,0h18v6H9v1H5V6H0V0z M1,5h2V2h1v3h1V1H1V5z M6,1v5h2V5h2V1H6z M8,2h1v2H8V2z M11,1v4h2V2h1v3h1V2h1v3h1V1H11z" | ||
| /> | ||
| <polygon fill="#fff" points="1,5 3,5 3,2 4,2 4,5 5,5 5,1 1,1 " /> | ||
| <path fill="#fff" d="M6,1v5h2V5h2V1H6z M9,4H8V2h1V4z" /> | ||
| <polygon | ||
| fill="#fff" | ||
| points="11,1 11,5 13,5 13,2 14,2 14,5 15,5 15,2 16,2 16,5 17,5 17,1 " | ||
| /> | ||
| </svg> | ||
| `; | ||
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| interface NpmPackage { | ||
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| description: string; | ||
| ['dist-tags']: {[tag: string]: string}; | ||
| } | ||
7 changes: 2 additions & 5 deletions
7
packages/lit-dev-content/samples/examples/async-task/project.json
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| { | ||
| "extends": "/samples/base.json", | ||
| "hide": true, | ||
| "title": "Async Task / NPM Info element", | ||
| "description": "Shows an example of an async Task controller. This one fetches npm package info and renders based on the state of the fetch.", | ||
| "section": "Specific Solutions", | ||
| "section": "Managing Data", | ||
| "files": { | ||
| "index.js": {}, | ||
| "npm-info.js": {}, | ||
| "task.js": {}, | ||
| "npm-info.ts": {}, | ||
| "index.html": {} | ||
| } | ||
| } |
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We'll need to update this for graduation. cc @rictic