芯资管项目要求el-transfer增加拖拽排序，左右上下互相拖拽功能；
原来的组件不支持拖拽，这里要用个第三方脱宅组件sortablejs

首先安装

sudo npm i sortablejs --save-dev

html代码

<template> <el-transfer ref="transfer" id="transfer" v-model="value" :data="data"> <span slot-scope="{ option }" :draggable="!option.disabled" @dragstart="drag($event,option)">{{ option.key }} - {{ option.label }}</span> </el-transfer></template>```

create

<script> import Sortable from 'sortablejs' export default { data() { const generateData = _ => { const data = []; for (let i = 1; i <= 15; i++) { data.push({ key: i, label: `备选项 ${i}`, disabled: i % 4 === 0 }); } return data; }; return { data: generateData(), value: [1, 4], draggingKey : null } }, mounted() { const transfer = this.$refs.transfer.$el const leftPanel = transfer.getElementsByClassName("el-transfer-panel")[0].getElementsByClassName("el-transfer-panel__body")[0]; const rightPanel = transfer.getElementsByClassName("el-transfer-panel")[1].getElementsByClassName("el-transfer-panel__body")[0]; const rightEl = rightPanel.getElementsByClassName("el-transfer-panel__list")[0] Sortable.create(rightEl,{ onEnd: (evt) => { const {oldIndex,newIndex} = evt; const temp = this.value[oldIndex] if (!temp || temp === 'undefined') { return }// 解决右边最后一项从右边拖左边，有undefined的问题 this.$set(this.value,oldIndex,this.value[newIndex]) this.$set(this.value,newIndex,temp) } }) const leftEl = leftPanel.getElementsByClassName("el-transfer-panel__list")[0] Sortable.create(leftEl,{ onEnd: (evt) => { const {oldIndex,newIndex} = evt; const temp = this.data[oldIndex] if (!temp || temp === 'undefined') { return } // 解决右边最后一项从右边拖左边，有undefined的问题 this.$set(this.data,oldIndex,this.data[newIndex]) this.$set(this.data,newIndex,temp) } }) leftPanel.ondragover = (ev) => { ev.preventDefault() } leftPanel.ondrop = (ev) => { ev.preventDefault(); const index = this.value.indexOf(this.draggingKey) if(index !== -1){ this.value.splice(index,1) } } rightPanel.ondragover = (ev) => { ev.preventDefault() } rightPanel.ondrop = (ev) => { ev.preventDefault(); if(this.value.indexOf(this.draggingKey) === -1){ this.value.push(this.draggingKey) } } }, methods: { drag(ev,option) { this.draggingKey = option.key } } } </script>

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