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vue-observer-directive

v1.2.5

Published

使用 IntersectionObserver 进行是否展示 DOM 判断(Vue@2自定义指令)

Downloads

19

Readme

vue-observer-directive

通过window.IntersectionObserver判断DOM是否在视口展示,在Vue@2自定义指令中进行方法执行。

  1. npm:https://www.npmjs.com/package/vue-observer-directive
  2. demo:https://realgeoffrey.github.io/vue-observer-directive/demo/index.html

安装

  1. Node.js安装

    npm install vue-observer-directive --save
  2. 浏览器引用

    <!-- 需要先引入vue:<script src="//unpkg.com/vue@2"></script> -->
    <script src="//unpkg.com/vue-observer-directive"></script>

注册指令

  1. Node.js注册

    1. 全局注册

      import Vue from 'vue'
      import vueObserverDirective from 'vue-observer-directive'
      
      // 全局注册
      Vue.use(vueObserverDirective, { directive: 'observer' }) // 自定义指令名默认是:observer
      // 或:Vue.directive('observer', vueObserverDirective)
    2. 局部注册

      import vueObserverDirective from 'vue-observer-directive'
      
      export default {
        directives: {
          // 局部注册
          observer: vueObserverDirective
        }
      }
  2. 浏览器注册

    1. 全局注册

      <!-- 需要先引入vue:<script src="//unpkg.com/vue@2"></script> -->
      <!-- 需要先引入vue-observer-directive:<script src="//unpkg.com/vue-observer-directive"></script> -->
      
      <script>
      // 全局注册
      Vue.use(vueObserverDirective, { directive: 'observer' }) // 自定义指令名默认是:observer
      // 或:Vue.directive('observer', vueObserverDirective)
      </script>
    2. 局部注册

      <!-- 需要先引入vue:<script src="//unpkg.com/vue@2"></script> -->
      <!-- 需要先引入vue-observer-directive:<script src="//unpkg.com/vue-observer-directive"></script> -->
      
      <script>
      new Vue({
        directives: {
          // 局部注册
          observer: vueObserverDirective
        }
      })
      </script>

用法

  1. 指令名称:v-observer

  2. 指令参数:

    1. 传给指令的参数::数字(数字:1~100)
    2. 修饰符:.once
    3. 绑定值:{ show: 可见时方法, hide: 非可见时方法 }
  • e.g.

    <!-- DOM展示100%时执行:方法1;否则执行:方法2 -->
    <div v-observer="{ show: 方法1, hide: 方法2 }" />
    
    <!-- DOM展示≥10%时执行:方法1;否则执行:方法2 -->
    <div v-observer:10="{ show: 方法1, hide: 方法2 }" />
    
    <!-- DOM展示100%时执行:方法1;否则执行:方法2。若展示过一次,则不再触发2个方法 -->
    <div v-observer.once="{ show: 方法1, hide: 方法2 }" />
    
    <!-- DOM展示≥80%时执行:方法1;否则执行:方法2。若展示过一次,则不再触发2个方法 -->
    <div v-observer:80.once="{ show: 方法1, hide: 方法2 }" />

注意

若用来处理无限加载的问题,则要考虑show方法仅在从消失变为展示时才会触发(window.IntersectionObserver作用原理),hide方法同理。

  • 可以在触发节点上增加v-if/v-show来处理无限加载

    e.g.<div v-if="showLoadMore" v-observer="{ show: () => { 加载数据;在加载数据前把showLoadMore设置为false、加载完毕后设置为true } }">