lottie实现vue自定义loading指令及常用指令封装详解

npm install lottie-web
// or
yarn add lottie-web

// loading.vue
<template>
  <div class="loading-wrap">
    <div id="loadingImg" />
  </div>
</template>
<script>
import lottie from "lottie-web"
// 在网上下载的lottie动画，这里我是在iconfont上找的
import animationData from "./loading.json"
export default {
  mounted() {
    // 解决json动画找不到dom不渲染问题
    window.requestAnimationFrame(this.loadImg);
  },
  methods: {
    loadImg () {
      lottie.loadAnimation({
        container: document.getElementById('loadingImg'),
        renderer: "svg",
        loop: true,
        autoplay: true,
        animationData: animationData
      });
    }
  }
};
</script>
<style lang="less" scoped>
.loading-wrap {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1800;
}
</style>

import Vue from 'vue'
import Loading from './loading.vue'
/**
 * Vue.extend 接受参数并返回一个构造器，new 该构造器可以返回一个组件实例
 * 当我们 new Mask() 的时候，把该组件实例挂载到一个 div 上
 **/
const Mask = Vue.extend(Loading)
// 更新是否显示
const toggleLoading = (el, binding) => {
  if (binding.value) {
    Vue.nextTick(() => {
      // 获取父元素的定位信息
      const isStatic = window.getComputedStyle(el).position === 'static'
      if (isStatic) {
        el.style.position = 'relative'
      }
      // 插入到目标元素
      insertDom(el, el, binding)
    })
  } else {
    removeDom(el, el, binding)
  }
}
// 插入到目标元素
const insertDom = (parent, el) => {
  parent.appendChild(el.mask)
}
// 从目标元素中移除
const removeDom = (parent, el) => {
  parent.removeChild(el.mask)
}
export default {
  // 第一次绑定到元素时调用
  bind: function (el, binding) {
    const mask = new Mask({
      el: document.createElement('div')
    })
    // 用一个变量接住mask实例
    el.instance = mask
    el.mask = mask.$el
    el.maskStyle = {}
    binding.value && toggleLoading(el, binding)
  },
  // 所在组件的 VNode 更新时调用--比较更新前后的值
  update: function (el, binding) {
    if (binding.oldValue !== binding.value) {
      toggleLoading(el, binding)
    }
  },
  // 指令与元素解绑时调用
  unbind: function (el) {
    el.instance && el.instance.$destroy()
  }
}

import Directive from './directives'
Vue.use(Directive)

 // App.vue
 <template>
  <div id="app" v-loading="isLoading">
  </div>
</template>
<script>
export default {
  name: 'App',
  data () {
    return {
      isLoading: true
    }
  },
  mounted () {
    setTimeout(() => {
      this.isLoading = false
    }, 3000)
  }
}
</script>

// clickoutside.js
export default {
  bind (el, binding, vnode) {
    function documentHandler (e) {
      if (el.contains(e.target)) {
        return false
      }
      if (binding.expression) {
        binding.value(e)
      }
    }
    el.__vueClickOutside__ = documentHandler
    document.addEventListener('click', documentHandler)
  },
  update () {
  },
  unbind (el, binding) {
    document.removeEventListener('click', el.__vueClickOutside__)
    delete el.__vueClickOutside__
  }
}

<template>
  <div id="app">
    <img  v-click-outside="handleOutSide" src="./assets/logo.png" >
  </div>
</template>
<script>
export default {
  name: 'App',
  methods: {
    handleOutSide () {
      console.log('到外面了')
    }
  }
}
</script>

import Loading from './loading'
import clickoutside from './clickoutside'
export default {
  install (Vue) {
    Vue.directive('loading', Loading),
    Vue.directive('click-outside', clickoutside)
  }
}