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Command Pattern in Frontend JavaScript
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| // Concrete Command | |
| class OpenAlertCommand { | |
| constructor(receiver) { | |
| this.receiver = receiver | |
| } | |
| execute() { | |
| this.receiver.alert('Gotcha!') | |
| } | |
| } | |
| // Receiver | |
| class Window { | |
| alert(message) { | |
| window.alert(message) | |
| } | |
| } | |
| // Invoker | |
| class Button { | |
| constructor(label, command) { | |
| this.label = label | |
| this.command = command | |
| this.node = document.createElement('button') | |
| this.build() | |
| } | |
| build() { | |
| this.node.innerText = this.label | |
| this.node.onclick = () => this.onClickHandler() | |
| } | |
| onClickHandler() { | |
| this.command.execute() | |
| } | |
| } | |
| // Client | |
| export class Application { | |
| constructor(node) { | |
| this.node = node | |
| } | |
| init() { | |
| const receiver = new Window() | |
| const command = new OpenAlertCommand(receiver) | |
| const button = new Button('Submit', command) | |
| this.node.appendChild(button.node) | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width,initial-scale=1"> | |
| <title>UI Kit</title> | |
| </head> | |
| <body> | |
| <main id="app"></main> | |
| <script async src="./index.js"></script> | |
| </body> | |
| </html> |
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| import {Application} from './app' | |
| const appNode = document.getElementById('app') | |
| const application = new Application(appNode) | |
| application.init() |
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