Created
January 29, 2023 07:45
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HTML Custom elements
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Custom Element</title> | |
| <style> | |
| h3 { | |
| color: brown; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h3>Test</h3> | |
| <todo-item checked="true"> | |
| Todo 1 | |
| <span slot="description">Description</span> | |
| </todo-item> | |
| <todo-item>Todo 2</todo-item> | |
| <todo-item>Todo 3</todo-item> | |
| <script> | |
| const todoItemTemplate = document.createElement("template") | |
| todoItemTemplate.innerHTML = ` | |
| <style> | |
| div { | |
| color: #176412; | |
| } | |
| .description { | |
| color: #777; | |
| font-size: .75rem; | |
| font-weight: lighter; | |
| margin: .5rem; | |
| } | |
| </style> | |
| <div> | |
| <input type="checkbox" /> | |
| <slot></slot> | |
| <span class="description"> | |
| <slot name="description"></slot> | |
| </span> | |
| </div> | |
| ` | |
| class TodoItem extends HTMLElement { | |
| constructor() { | |
| super() | |
| const shadow = this.attachShadow({ mode: 'open' }) | |
| shadow.append(todoItemTemplate.content.cloneNode(true)) | |
| this.checkbox = shadow.querySelector('input[type=checkbox]') | |
| } | |
| static get observedAttributes() { | |
| return ['checked'] | |
| } | |
| attributeChangedCallback(name, oldValue, newValue) { | |
| console.log(name, oldValue, newValue) | |
| if (name === 'checked') { | |
| this.updateChecked(newValue) | |
| } | |
| } | |
| connectedCallback() { | |
| console.log('connected') | |
| } | |
| disconnectedCallback() { | |
| console.log('disconnected') | |
| } | |
| updateChecked(value) { | |
| this.checkbox.checked = value != null && value !== 'false' | |
| } | |
| } | |
| customElements.define('todo-item', TodoItem) | |
| </script> | |
| </body> | |
| </html> |
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