這篇文章主要介紹了vue element el-transfer增加拖拽功能，文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨著小編來一起學習學習吧
芯資管項目要求el-transfer增加拖拽排序，左右上下互相拖拽功能；
原來的組件不支持拖拽，這里要用個第三方脫宅組件sortablejs
首先安裝
sudo npm i sortablejs --save-dev
html代碼
<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: `備選項 ${i}`,
disabled: i % 4 === 0
});
} return data;
}; return {
data: generateData(),
value: [1, 4],
draggingKey : null
}
},
mounted() {
const transfer = this.$refs.transfer.$el
const leftPanel = transfer.getElementsByClassName("el-transfer-panel")[0].getElementsByClassName("el-transfer-panel__body")[0];
const rightPanel = transfer.getElementsByClassName("el-transfer-panel")[1].getElementsByClassName("el-transfer-panel__body")[0];
const rightEl = rightPanel.getElementsByClassName("el-transfer-panel__list")[0]
Sortable.create(rightEl,{
onEnd: (evt) => {
const {oldIndex,newIndex} = evt;
const temp = this.value[oldIndex]
if (!temp || temp === 'undefined') {
return
}// 解決右邊最后一項從右邊拖左邊，有undefined的問題
this.$set(this.value,oldIndex,this.value[newIndex])
this.$set(this.value,newIndex,temp)
}
})
const leftEl = leftPanel.getElementsByClassName("el-transfer-panel__list")[0]
Sortable.create(leftEl,{
onEnd: (evt) => {
const {oldIndex,newIndex} = evt;
const temp = this.data[oldIndex]
if (!temp || temp === 'undefined') {
return
} // 解決右邊最后一項從右邊拖左邊，有undefined的問題
this.$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>到此這篇關于vue element el-transfer增加拖拽功能的文章就介紹到這了。
