看效果：
可以实现单个拖拽、双击添加、按住ctrl键实现多个添加，或者按住shift键实现范围添加，添加到框中的数据，还能拖拽排序
先安装 vuedraggable
这是他的官网 vue.draggable中文文档 - itxst.com
npm i vuedraggable -S直接粘贴代码即可：
index.vue
<template>
<div class="w-full h-full">
<!-- 页面拖拽组件 -->
<div class="leftPart">
<ElTree
class="w100%"
:data="$.treeData"
ref="treeTableListRef"
:props="$.defaultProps"
highlight-current
:expand-on-click-node="false"
key="id"
:default-expand-all="true"
@node-click="(data, node) => $.tableFieldsNodeClick(data, node, treeTableListRef)"
>
<template #default="{ data }">
<Draggable
:list="[data]"
ghost-class="ghost"
chosen-class="chosenClass"
animation="300"
@start="onStart"
@end="onEnd"
group="group1"
v-tooltip="`Tips：按住Ctrl或Shift进行批量选择`"
>
<template #item="{ element }">
<div @dblclick="dbAddData(element)" style="user-select: none" class="item">
{{ element.name }}
</div>
</template>
</Draggable>
</template>
</ElTree>
</div>
<!-- 右侧内容 -->
<div class="rightPart">
<div class="flex">
<div
@mouseover="divMouseOver"
@mouseleave="divMouselease"
class="w-full rightContent"
style="border: 1px solid #ccc"
>
<Draggable
:list="state.list"
ghost-class="ghost"
group="group1"
chosen-class="chosenClass"
animation="300"
@start="onStart"
@end="onEnd"
@add="addData"
class="w-full dragArea"
>
<template #item="{ element }">
<div class="item">
{{ element.name }}
</div>
</template>
</Draggable>
</div>
</div>
</div>
</div>
</template>
<script setup lang="ts">
import Draggable from "vuedraggable";
import { useData } from "./hooks/drag";
const treeTableListRef = ref();
let { $data: $ } = useData();
const state = reactive<any>({
//需要拖拽的数据，拖拽后数据的顺序也会变化
list: [],
});
//拖拽开始的事件
const onStart = () => {
console.log("开始拖拽");
};
const divMouseOver = (e: any) => {};
const divMouselease = (e: any) => {};
//拖拽结束的事件
const onEnd = () => {
console.log("结束拖拽");
};
// 双击添加
const dbAddData = (data: any) => {
let i = state.list.findIndex((a: any) => a.id == data.id);
if (data.children) return; //父级节点不添加
if (i == -1) state.list.push(data);
};
// 批量添加
const addData = () => {
// 拿到所有nodes节点数组
const nodes = treeTableListRef.value.store._getAllNodes();
nodes.map((a: any) => {
if ($.selectNodes.includes(a.id)) {
state.list.push(a.data);
}
// 排除父级，只添加子级
state.list = state.list.filter((a: any) => !a.children);
// 去重
state.list = [...new Set(state.list)];
});
};
onMounted(() => {});
onBeforeMount(() => {
window.addEventListener("keydown", handleKeyDown);
window.addEventListener("keyup", handleKeyUp);
});
// 按下为true
const handleKeyDown = (event: any) => {
// 代表按下的是ctrl键
if (event.key == "Control") {
$.ctrlKeyPressed = true;
}
// 代表按下的是shift键
if (event.key == "Shift") {
$.shiftKeyPressed = true;
}
};
// 释放为false
const handleKeyUp = (event: any) => {
// 代表按下的是ctrl键
if (event.key == "Control") {
$.ctrlKeyPressed = false;
}
// 代表按下的是shift键
if (event.key == "Shift") {
$.shiftKeyPressed = false;
}
};
</script>
<style scoped lang="scss">
.leftPart {
width: 20%;
height: 100%;
float: left;
border-right: 1px dashed #ccc;
}
.rightPart {
padding: 20px;
width: 60%;
height: 100%;
float: left;
}
.list_drap {
min-width: 120px;
max-height: 86px;
min-height: 22px;
overflow-y: auto;
height: auto;
}
.rightContent {
border-radius: 4px;
min-height: 30px;
display: flex;
}
.dragArea {
padding: 10px 5px;
flex-grow: 1;
.item {
float: left;
min-width: 50px;
display: inline;
margin: 0 3px 2px 3px;
background-color: rgb(235, 241, 255);
color: #3370ff;
font-size: 12px;
cursor: all-scroll;
user-select: none;
height: 20px;
line-height: 20px;
padding-left: 9px;
padding-right: 9px;
background: #ececfd;
color: #333333;
font-size: 12px;
}
}
</style>
drag.ts
export function useData() {
const $data: any = reactive({
ctrlKeyPressed: false,
shiftKeyPressed: false,
shiftKeyFelid: [],
defaultProps: {
children: "children",
label: "name",
},
treeData: [
{
name: "一级1",
id: 1,
children: [
{
name: "二级1",
id: 2,
children: [
{
name: "三级1",
id: 2,
},
{
name: "三级2",
id: 4,
},
{
name: "三级3",
id: 5,
},
{
name: "三级4",
id: 6,
},
{
name: "三级5",
id: 7,
},
],
},
{
name: "二级2",
id: 8,
},
{
name: "二级3",
id: 9,
},
{
name: "二级4",
id: 10,
},
{
name: "二级5",
id: 11,
},
],
},
{
name: "一级2",
id: 12,
children: [
{
name: "二级1",
id: 13,
},
{
name: "二级2",
id: 14,
},
{
name: "二级3",
id: 15,
},
{
name: "二级4",
id: 16,
},
{
name: "二级5",
id: 17,
},
],
},
],
selectNodes: [],
treeTableListRef: null,
});
// 节点选中事件
$data.tableFieldsNodeClick = (nodeData: any, node: any, treeTableListRef: any) => {
const nodes = treeTableListRef.store._getAllNodes(); //所有node节点
const ishas = $data.selectNodes.includes(node.id);
// 递归遍历节点数组进行ID存放
function addSelectId(arr: any) {
for (const item of arr) {
$data.selectNodes.push(item.id);
if (Array.isArray(item.childNodes) && item.childNodes.length) {
addSelectId(item.childNodes);
}
}
}
// 递归遍历删除节点id
function delSelectId(arr: any) {
for (const item of arr) {
const index = $data.selectNodes.findIndex((x: any) => x == item.id);
$data.selectNodes.splice(index, 1);
if (Array.isArray(item.children) && item.children.length) {
delSelectId(item.children);
}
}
}
// 按住了ctrl键，可以进行单个多选
if ($data.ctrlKeyPressed) {
// 如果为true代表当前选中的节点已存在
if (ishas) {
// 查找当前选中的节点的索引
const index = $data.selectNodes.findIndex((x: any) => x == node.id);
// 删除父节点
$data.selectNodes.splice(index, 1);
// 删除子节点
if (Array.isArray(node.childNodes) && node.childNodes.length) {
delSelectId(node.childNodes);
}
} else {
// 否则当前选中的节点不存在，就加入到已选节点数组序列
$data.selectNodes.push(node.id);
// 防止选中的是父节点，就需要递归将子节点加入
if (Array.isArray(node.childNodes) && node.childNodes.length) {
addSelectId(node.childNodes);
}
}
node.isCurrent = !node.isCurrent;
// 按下了shift键，可以进行范围多选
} else if ($data.shiftKeyPressed) {
// 先清空
$data.selectNodes = [];
// 将当前节点放入
$data.selectNodes.push(node.id);
$data.shiftKeyFelid.push(node.id);
if ($data.shiftKeyFelid.length > 1) {
// 首索引
const sIndex = nodes.findIndex((x: any) => x.id == $data.shiftKeyFelid[0]);
// 尾索引
const eIndex = nodes.findIndex((x: any) => x.id == $data.shiftKeyFelid[$data.shiftKeyFelid.length - 1]);
// 根据首尾索引，存入中间节点
const s = sIndex < eIndex ? sIndex : eIndex; //取小值当开头索引
const e = sIndex < eIndex ? eIndex : sIndex; //取大值当结尾索引
for (let i = s; i < e; i++) {
$data.selectNodes.push(nodes[i].id);
}
}
} else {
// 否则就是单机选择
$data.shiftKeyFelid = [];
$data.selectNodes = [];
$data.selectNodes = [node.id];
}
// 下面是对已选中的节点，进行高亮展示
// 通过控制elementui中节点上的isCurrent属性
// isCurrent为true是高亮，否则取消高亮
for (const item of nodes) {
if ($data.selectNodes.includes(item.id)) {
item.isCurrent = true;
} else {
item.isCurrent = false;
}
}
};
return {
$data: $data,
};
}
