自定义指令下拉菜单隐藏

1. 基于element-ui dropDown插件进行的下拉菜单隐藏指令，可用于自己自定义的下拉菜单

const isServer = false;
/* istanbul ignore next */
export const on = (function () {
  if (!isServer && document.addEventListener) {
    return function (element, event, handler) {
      if (element && event && handler) {
        element.addEventListener(event, handler, false);
      }
    };
  } else {
    return function (element, event, handler) {
      if (element && event && handler) {
        element.attachEvent('on' + event, handler);
      }
    };
  }
})();

const nodeList = [];
const ctx = '@@clickoutsideContext';

let startClick;
let seed = 0;

on(document, 'mousedown', (e) => (startClick = e));
on(document, 'mouseup', (e) => {
  nodeList.forEach((node) => node[ctx].documentHandler(e, startClick));
});

function createDocumentHandler(el, binding, vnode) {
  return function (mouseup = {}, mousedown = {}) {
    if (!vnode || !vnode.context || !mouseup.target || !mousedown.target || el.contains(mouseup.target) || el.contains(mousedown.target) || el === mouseup.target || (vnode.context.popperElm && (vnode.context.popperElm.contains(mouseup.target) || vnode.context.popperElm.contains(mousedown.target))))
      return;

    if (binding.expression && el[ctx].methodName && vnode.context[el[ctx].methodName]) {
      vnode.context[el[ctx].methodName]();
    } else {
      el[ctx].bindingFn && el[ctx].bindingFn();
    }
  };
}

/**
 * v-clickoutside
 * @desc 点击元素外面才会触发的事件
 * @example
 * ```vue
 * 

 * ```
 */
export default {
  bind(el, binding, vnode) {
    nodeList.push(el);
    const id = seed++;

    el[ctx] = {
      id,
      documentHandler: createDocumentHandler(el, binding, vnode),
      methodName: binding.expression,
      bindingFn: binding.value,
    };
  },

  update(el, binding, vnode) {
    el[ctx].documentHandler = createDocumentHandler(el, binding, vnode);
    el[ctx].methodName = binding.expression;
    el[ctx].bindingFn = binding.value;
  },

  unbind(el) {
    let len = nodeList.length;

    for (let i = 0; i < len; i++) {
      if (nodeList[i][ctx].id === el[ctx].id) {
        nodeList.splice(i, 1);
        break;
      }
    }
    delete el[ctx];
  },
};

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2. 使用如下

<template>
    <ul>
    	<li v-for="item in list" :key="item.id" v-clickoutslide="() => this.handleClearMore(item)" ></li>
		......
	 <ul>
</template>

// 也可以的做成全局的自定义指令
// 指令接受一个改变状态的函数为参数
import clickoutside from "@/directives/clickoutside.js"



export default {
    directives:{
        clickoutslide
    },
    
    
    methods:{
         handleClearMore(item) {
            item.more = false;
        },
    }
}

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