• Web Components 组件库 All In One


    Web Components 组件库 All In One

    原生组件、跨平台、高性能、无框架依赖、高度自定义、高可复用性、高扩展性、体积小

    # Web Components UI
    $ npm i -S @xgqfrms/wcui
    
    # $ npm i -S @xgqfrms/webcomponents-ui
    
    

    https://www.npmjs.com/package/@xgqfrms/wcui

    https://www.npmjs.com/package/wcui

    https://www.npmjs.com/package/web-components-ui

    Lit

    https://lit.dev/playground/

    @customElement & @property

    import {html, css, LitElement} from 'lit';
    // @Decorator 装饰器/修饰器
    import {customElement, property} from 'lit/decorators.js';
    
    @customElement('simple-greeting')
    export class SimpleGreeting extends LitElement {
      // static styles = css`p { color: 'blue' }`;
      @property()
      name = 'defualt name';
      @property()
      color = 'blue';
      render() {
        return html`<p style="color: ${this.color}">${this.name}!</p>`;
      }
    }
    
    import {html, css, LitElement} from 'lit';
    
    export class SimpleGreeting extends LitElement {
      static styles = css`p { color: blue }`;
      static properties = {
        name: {type: String},
        color: {type: String}
      };
      constructor() {
        super();
        this.name = 'default name';
      }
      render() {
        return html`<p style="color: ${this.color}">Hello, ${this.name}!</p>`;
      }
    }
    // 组册组件
    customElements.define('simple-greeting', SimpleGreeting);
    
    
    

    <!DOCTYPE html>
    <html lang="zh-Hans">
    <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <meta http-equiv="X-UA-Compatible" content="ie=edge">
      <meta name="author" content="xgqfrms">
      <meta name="generator" content="VS code">
      <script type="module" src="./simple-greeting.js"></script>
    </head>
    <body>
      <!--  simple-greeting  -->
      <simple-greeting></simple-greeting>
      <simple-greeting name="xgqfrms @ 2022" color="red"></simple-greeting>
      <simple-greeting name="Hello World!"></simple-greeting>
    </body>
    
    
    

    https://github.com/xgqfrms/vscode/blob/master/code-snippets/pwa-html5.json

    demos

    https://www.webcomponents.org/element/emoji-element

    Web Components

    1. Autonomous custom elements (自主自定义标签)

    adoptedCallback

    class MyElement extends HTMLElement {
      constructor() {
        super();
        // 元素在这里创建
      }
    
      connectedCallback() {
        // 在元素被添加到文档之后,浏览器会调用这个方法
        //(如果一个元素被反复添加到文档/移除文档,那么这个方法会被多次调用)
      }
    
      disconnectedCallback() {
        // 在元素从文档移除的时候,浏览器会调用这个方法
        // (如果一个元素被反复添加到文档/移除文档,那么这个方法会被多次调用)
      }
    
      static get observedAttributes() {
        return [/* 属性数组,这些属性的变化会被监视 */];
      }
    
      attributeChangedCallback(name, oldValue, newValue) {
        // 当上面数组中的属性发生变化的时候,这个方法会被调用
      }
    
      adoptedCallback() {
        // 在元素被移动到新的文档的时候,这个方法会被调用
        // (document.adoptNode 会用到, `非常少见` ⚠️)
      }
    
      // 还可以添加更多的元素方法和属性
    }
    
    // 这个按钮在被点击的时候说 "hello"
    class WCUIButton extends HTMLElement {
      constructor() {
        super();
        this.bindOnce = true;
      }
      connectedCallback() {
        const styles = `
          color: #0f0;
          background: #000;
          padding: 10px;
          font-size: 23px;
          margin: 0;
          cursor: pointer;
        `;
        const templateString = `
          <template id="wcui-button-template">
            <button id="wcui-button" style="${styles}">
              ${this.text || 'button'}
            </button>
          </template>
        `;
        // templet => dom
        document.body.insertAdjacentHTML(`beforeend`, templateString);
        const template = document.querySelector(`#wcui-button-template`);
        const content = template.content.cloneNode(true);
        this.btn = content.querySelector(`#wcui-button`);
        // console.log('✅this.btn =', this.btn);
        this.render();
        const shadow = this.attachShadow({
          mode: 'open',
        });
        shadow.appendChild(content);
      }
      // ✅ 必须使用 observedAttributes 指定要观察值会变化的 props, 不然 attributeChangedCallback 不会执行
      static get observedAttributes() {
        return ['text', 'callback', 'btn'];
      }
      // 生命周期方法 attributeChangedCallback
      // 当 custom element 增加、删除、修改`自身属性`时,被调用。
      attributeChangedCallback(prop, oldValue, newValue) {
        // console.log(' prop =', prop);
        // console.log('oldValue, newValue =', oldValue, newValue);
        this[prop] = newValue;
        this.render();
      }
      render() {
        // console.log('❌ this.btn =', this.btn);
        if(this.btn && this.bindOnce) {
          this.bindOnce = false;
          this.btn.addEventListener('click', () => {
            alert("Hello wcui-button!");
          });
        }
      }
    }
    
    customElements.define('wcui-button', WCUIButton);
    
    
    
    1. Customized built-in elements (自定义内建元素)

    HTMLButtonElement

    // 这个按钮在被点击的时候说 "hello"
    class HelloButton extends HTMLButtonElement {
      constructor() {
        super();
        this.addEventListener('click', () => alert("Hello!"));
      }
    }
    
    customElements.define('hello-button', HelloButton, {extends: 'button'});
    
    <button is="hello-button">Click me</button>
    
    <button is="hello-button" disabled>Disabled</button>
    

    https://zh.javascript.info/custom-elements

    refs

    https://developer.mozilla.org/en-US/docs/Web/Web_Components

    https://www.webcomponents.org/introduction

    https://lit.dev/

    https://www.cnblogs.com/xgqfrms/tag/web components/

    https://zh.javascript.info/custom-elements



    ©xgqfrms 2012-2020

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    原创文章,版权所有©️xgqfrms, 禁止转载 ️,侵权必究⚠️!


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  • 原文地址:https://www.cnblogs.com/xgqfrms/p/16423956.html
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