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@zhinan-oppo/lazyload

v3.28.2

Published

lazyload images and videos

Downloads

11

Readme

懒加载

Install

使用 yarn 安装

yarn add @zhinan-oppo/lazyload

CommonJS 引用方式

import { init } from '@zhinan-oppo/lazyload';

Usage

默认配置

interface MediaConfig {
  attr: string;      # 尺寸对应的属性名
  start?: number;    # 最小屏幕宽度,默认为 0
  end?: number;      # 最大屏幕宽度,默认为无限大
}
export interface LazyLoadConfig {
  defaultURLAttr: string;
  dstNameAttr: string;
  loadedClassAttr: string;
  eventFlag: string;
  bgFlag: string;
  loadEarlyFlag: string;
  medias: MediaConfig[];
}
const config: LazyLoadConfig = {
  defaultURLAttr: 'z-src',
  dstNameAttr: 'z-dst',
  loadedClassAttr: 'z-loaded-class',
  eventFlag: 'z-event',
  bgFlag: 'z-bg',
  loadEarlyFlag: 'z-early',
  medias: [
    {
      attr: 'z-src-mb',
      start: 0,
      end: 568,
    },
    {
      attr: 'z-src-pc',
      start: 569,
    },
  ],
};
  • defaultURLAttr: 默认的 URL 属性名,medias 中未定义相应的 attr 时使用该值,默认为'z-src'
  • dstNameAttr: 默认给 element 添加 src 属性,通过 dstNameAttr 可以修改为其它属性
    • dstNameAttr 默认为'z-dst'
    • 例如,<a z-src="/path/to.png" z-dst="href" z-early>会被加载为<a href="/path/to.png">
  • loadedClassAttr: 通过该属性设置懒加载后添加的类名,可以通过' '隔开多个类名
  • eventFlag: 通过该属性判断是否在懒加载完成后触发lazy-loaded事件,可以通过element.addEventListener('lazy-loaded', ...)监听
    • event.detail 为实际 load 的URL
    • 注意:如果添加了z-early,事件会在初始化的时候就 dispatch,在这之后添加的处理函数无法被触发
  • bgFlag: 通过该属性判断是否设置为背景图片
  • loadEarlyFlag: 通过该属性判断是否在初始化时就加载
  • medias: 屏幕宽度查询条件

修改配置

function configure(config: Partial<LazyLoadConfig>): void;

根据配置通过 DOM 属性初始化 element

function init(config?: Partial<LazyLoadConfig>, root = window.document): void;
  • 其中init相当于configure(config) + initByAttributes(root)
import { init } from '@zhinan-oppo/lazyload';

document.addEventListener('DOMContentLoaded', event => {
  init({
    medias: [
      {
        attr: 'z-src-mb',
        start: 0,
        end: 568,
      },
      {
        attr: 'z-src-pc',
        start: 569,
      },
    ],
  });
});

原理

根据尺寸选择不同的标签值,在滚动过程中,加到src(或自定义)属性值里

默认配置下的使用示例

基础使用

<div z-src-mb="example-mb.png" z-src-pc="example-pc.png"></div>

加载背景图片

<div z-bg z-src-mb="example-mb.png" z-src-pc="example-pc.png"></div>

在初始化时立即加载

<div z-early z-src-mb="example-mb.png" z-src-pc="example-pc.png"></div>

将 url 加载到属性 href

<a z-dst="href" z-early z-src="example-mb.png" z-src-pc="example-pc.png"></a>

将得到

<a href="example-pc.png"></a>

懒加载后添加lazy-loaded类名

<div
  z-loaded-class="lazy-loaded"
  z-src-mb="example-mb.png"
  z-src-pc="example-pc.png"
></div>

在懒加载后将得到

<div class="lazy-loaded" src="example-mb.png"></div>

触发lazy-loaded事件

HTML
<div
  z-event
  z-src-mb="example-mb.png"
  z-src-pc="example-pc.png"
  id="element"
></div>
js
const element = document.getElementById('element');
element.addEventListener('lazy-loaded', event => {
  console.log(`Loaded URL: ${event.detail}`);
  event.preventDefault(); // 可以阻止 z-loaded-class 被添加
});