vue如何使用element组件自定义v-loading

import Vue from 'vue';
import Loading from './loading.vue';
import { addClass, removeClass, getStyle } from 'element-ui/src/utils/dom';
import { PopupManager } from 'element-ui/src/utils/popup';
import afterLeave from 'element-ui/src/utils/after-leave';
const Mask = Vue.extend(Loading);
// Mask 是一个虚拟DOM
const loadingDirective = {};
loadingDirective.install = Vue => {
  if (Vue.prototype.$isServer) return;
  const toggleLoading = (el, binding) => {
    if (binding.value) {
      Vue.nextTick(() => {
        if (binding.modifiers.fullscreen) {
          el.originalPosition = getStyle(document.body, 'position');
          el.originalOverflow = getStyle(document.body, 'overflow');
          el.maskStyle.zIndex = PopupManager.nextZIndex();

          addClass(el.mask, 'is-fullscreen');
          insertDom(document.body, el, binding);
        } else {
          removeClass(el.mask, 'is-fullscreen');

          if (binding.modifiers.body) {
            el.originalPosition = getStyle(document.body, 'position');

            ['top', 'left'].forEach(property => {
              const scroll = property === 'top' ? 'scrollTop' : 'scrollLeft';
              el.maskStyle[property] = el.getBoundingClientRect()[property] +
                document.body[scroll] +
                document.documentElement[scroll] -
                parseInt(getStyle(document.body, `margin-${ property }`), 10) +
                'px';
            });
            ['height', 'width'].forEach(property => {
              el.maskStyle[property] = el.getBoundingClientRect()[property] + 'px';
            });

            insertDom(document.body, el, binding);
          } else {
            el.originalPosition = getStyle(el, 'position');
            insertDom(el, el, binding);
          }
        }
      });
    } else {
      afterLeave(el.instance, () => {
        if (!el.instance.hiding) return;
        el.domVisible = false;
        const target = binding.modifiers.fullscreen || binding.modifiers.body
          ? document.body
          : el;
        removeClass(target, 'el-loading-parent--relative');
        removeClass(target, 'el-loading-parent--hidden');
        el.instance.hiding = false;
      }, 300, true);
      el.instance.visible = false;
      el.instance.hiding = true;
    }
  };
  const insertDom = (parent, el, binding) => {
    if (!el.domVisible && getStyle(el, 'display') !== 'none' && getStyle(el, 'visibility') !== 'hidden') {
      Object.keys(el.maskStyle).forEach(property => {
        el.mask.style[property] = el.maskStyle[property];
      });

      if (el.originalPosition !== 'absolute' && el.originalPosition !== 'fixed') {
        addClass(parent, 'el-loading-parent--relative');
      }
      if (binding.modifiers.fullscreen && binding.modifiers.lock) {
        addClass(parent, 'el-loading-parent--hidden');
      }
      el.domVisible = true;

      parent.appendChild(el.mask);
      Vue.nextTick(() => {
        if (el.instance.hiding) {
          el.instance.$emit('after-leave');
        } else {
          el.instance.visible = true;
        }
      });
      el.domInserted = true;
    } else if (el.domVisible && el.instance.hiding === true) {
      el.instance.visible = true;
      el.instance.hiding = false;
    }
  };
  Vue.directive('loading', { // 自定义全局指令
    bind: function(el, binding, vnode) {
      const textExr = el.getAttribute('element-loading-text');
      const spinnerExr = el.getAttribute('element-loading-spinner');
      const backgroundExr = el.getAttribute('element-loading-background');
      const customClassExr = el.getAttribute('element-loading-custom-class');
      const vm = vnode.context;
      const mask = new Mask({
        el: document.createElement('div'),
        data: {
          text: vm && vm[textExr] || textExr,
          spinner: vm && vm[spinnerExr] || spinnerExr,
          background: vm && vm[backgroundExr] || backgroundExr,
          customClass: vm && vm[customClassExr] || customClassExr,
          fullscreen: !!binding.modifiers.fullscreen
        }
      });
      el.instance = mask;
      el.mask = mask.$el;
      el.maskStyle = {};

      binding.value && toggleLoading(el, binding);
    },
    update: function(el, binding) {
      el.instance.setText(el.getAttribute('element-loading-text'));
      if (binding.oldValue !== binding.value) {
        toggleLoading(el, binding);
      }
    },
    unbind: function(el, binding) {
      if (el.domInserted) {
        el.mask &&
        el.mask.parentNode &&
        el.mask.parentNode.removeChild(el.mask);
        toggleLoading(el, { value: false, modifiers: binding.modifiers });
      }
      el.instance && el.instance.$destroy();
    }
  });
};

export default loadingDirective;

import Vue from 'vue';
import loadingVue from './loading.vue';
import { addClass, removeClass, getStyle } from 'element-ui/src/utils/dom';
import { PopupManager } from 'element-ui/src/utils/popup';
import afterLeave from 'element-ui/src/utils/after-leave';
import merge from 'element-ui/src/utils/merge';

const LoadingConstructor = Vue.extend(loadingVue);

const defaults = {
  text: null,
  fullscreen: true,
  body: false,
  lock: false,
  customClass: ''
};

let fullscreenLoading;

LoadingConstructor.prototype.originalPosition = '';
LoadingConstructor.prototype.originalOverflow = '';

LoadingConstructor.prototype.close = function() {
  if (this.fullscreen) {
    fullscreenLoading = undefined;
  }
  afterLeave(this, () => {
    const target = this.fullscreen || this.body
      ? document.body
      : this.target;
    removeClass(target, 'el-loading-parent--relative');
    removeClass(target, 'el-loading-parent--hidden');
    if (this.$el && this.$el.parentNode) {
      this.$el.parentNode.removeChild(this.$el);
    }
    this.$destroy();
  }, 300);
  this.visible = false;
};

const addStyle = (options, parent, instance) => {
  let maskStyle = {};
  if (options.fullscreen) {
    instance.originalPosition = getStyle(document.body, 'position');
    instance.originalOverflow = getStyle(document.body, 'overflow');
    maskStyle.zIndex = PopupManager.nextZIndex();
  } else if (options.body) {
    instance.originalPosition = getStyle(document.body, 'position');
    ['top', 'left'].forEach(property => {
      let scroll = property === 'top' ? 'scrollTop' : 'scrollLeft';
      maskStyle[property] = options.target.getBoundingClientRect()[property] +
        document.body[scroll] +
        document.documentElement[scroll] +
        'px';
    });
    ['height', 'width'].forEach(property => {
      maskStyle[property] = options.target.getBoundingClientRect()[property] + 'px';
    });
  } else {
    instance.originalPosition = getStyle(parent, 'position');
  }
  Object.keys(maskStyle).forEach(property => {
    instance.$el.style[property] = maskStyle[property];
  });
};
const Loading = (options = {}) => {
  if (Vue.prototype.$isServer) return;
  options = merge({}, defaults, options);
  if (typeof options.target === 'string') {
    options.target = document.querySelector(options.target);
  }
  options.target = options.target || document.body;
  if (options.target !== document.body) {
    options.fullscreen = false;
  } else {
    options.body = true;
  }
  if (options.fullscreen && fullscreenLoading) {
    return fullscreenLoading;
  }

  let parent = options.body ? document.body : options.target;
  let instance = new LoadingConstructor({
    el: document.createElement('div'),
    data: options
  });
  addStyle(options, parent, instance);
  if (instance.originalPosition !== 'absolute' && instance.originalPosition !== 'fixed') {
    addClass(parent, 'el-loading-parent--relative');
  }
  if (options.fullscreen && options.lock) {
    addClass(parent, 'el-loading-parent--hidden');
  }
  parent.appendChild(instance.$el);
  Vue.nextTick(() => {
    instance.visible = true;
  });
  if (options.fullscreen) {
    fullscreenLoading = instance;
  }
  return instance;
};
export default Loading;

<template>
  <div class="loading-index">
    <transition name="el-loading-fade" @after-leave="handleAfterLeave">
      <div
        v-show="visible"
        class="el-loading-mask"
        :style="{ backgroundColor: background || '' }"
        :class="[customClass, { 'is-fullscreen': fullscreen }]"
      >
        <div class="el-loading-spinner">
          <!-- <svg v-if="!spinner" class="circular" viewBox="25 25 50 50">
          <circle class="path" cx="50" cy="50" r="20" fill="none"/>
        </svg>
        <i v-else :class="spinner"></i>
        <p v-if="text" class="el-loading-text">{{ text }}</p> -->
          <div class="number">
            <span
              v-for="(item, index) in 'loading...'"
              :style="
                'animation: totop 1.5s ' + 0.1 * index + 's infinite ease-out'
              "
              :key="index"
            >
              {{ item }}
            </span>
          </div>
        </div>
      </div>
    </transition>
  </div>
</template>

<script>
export default {
  data() {
    return {
      text: null,
      spinner: null,
      background: null,
      fullscreen: true,
      visible: false,
      customClass: "",
    };
  },

  methods: {
    handleAfterLeave() {
      this.$emit("after-leave");
    },
    setText(text) {
      this.text = text;
    },
  },
};
</script>

<style lang="less">
.loading-index {
  .number {
    line-height: 250px;
    font-size: 24px;
    color: #000;
    text-align: center;
    span {
      position: relative;
      margin-right: -6px;
    }
  }
  @keyframes totop {
    0% {
      top: 0;
    }
    24% {
      top: 0;
    }
    33% {
      top: -7px;
    }
    39% {
      top: -7px;
    }
    45% {
      top: 0;
    }
    100% {
      top: 0;
    }
  }
}
</style>

import directive from './src/directive';
import service from './src/index';
export default {
  install(Vue) {
    Vue.use(directive);
    Vue.prototype.$loading = service;
  },
  directive,
  service
};