專案需要一個可以拖拽排序的樹形表格，github上搜了一下，併為找到，大部分都不支援拖拽，所以自己實現了一個簡單的元件，已開源 原始碼在這裡，併發布到npm上，如果有類似需求可以試一下，chrome上沒有任何問題
效果圖如下：
使用方式
npm i drag-tree-table --save-dev
複製程式碼import dragTreeTable from 'drag-tree-table'
複製程式碼<dragTreeTable :data="treeData" :onDrag="onTreeDataChange"></dragTreeTable>
複製程式碼// state
treeData: {
lists: [],
columns: []
}
// methods
onTreeDataChange(list) {
this.treeData.lists = list
},
複製程式碼資料來源（lists）配置
| 引數 | 可選值 | 描述 |
|---|---|---|
| id | String | 唯一標誌 |
| parent_id | String | 父節點ID |
| order | Number | 排序,0開始,onDrag後order會重置 |
| name | String | 預設顯示內容 |
| open | Boolean | true展開,false收起 |
| lists | Array | 子節點 |
lists 配置示例
[
{
"id":40,
"parent_id":0,
"order":0,
"name":"動物類",
"uri":"/masd/ds",
"open":true,
"lists":[]
},{
"id":5,
"parent_id":0,
"order":1,
"name":"昆蟲類",
"uri":"/masd/ds",
"open":true,
"lists":[
{
"id":12,
"parent_id":5,
"open":true,
"order":0,
"name":"螞蟻",
"uri":"/masd/ds",
"lists":[]
}
]
},
{
"id":19,
"parent_id":0,
"order":2,
"name":"植物類",
"uri":"/masd/ds",
"open":true,
"lists":[]
}
]
複製程式碼列（columns）配置
| 引數 | 可選值 | 描述 |
|---|---|---|
| type | 'selection', 'actions' | selection會顯示摺疊圖示，actions指操作欄 |
| title | String | 表格標題 |
| field | String | 單元格內容取值使用 |
| width | Number | 單元格寬度 |
| align | left,center,right | 單元格對齊方式，預設局左對齊 |
| formatter | Function | 自定義單元格顯示內容,引數為當前行資料 |
columns 配置示例
[
{
type: 'selection',
title: '選單名稱',
field: 'name',
width: 200,
align: 'center',
formatter: (item) => {
return '<a>'+item.name+'</a>'
}
},
{
title: '連結',
field: 'url',
width: 200,
align: 'center'
},
{
title: '操作',
type: 'action',
width: 350,
align: 'center',
actions: [
{
text: '檢視角色',
onclick: this.onDetail,
formatter: (item) => {
return '<i>檢視角色</i>'
}
},
{
text: '編輯',
onclick: this.onEdit,
formatter: (item) => {
return '<i>編輯</i>'
}
}
]
},
]
複製程式碼實現原理
元件結構
dragTreeTable.vue是入口元件，定義整體結構
row是遞迴元件（核心元件）
clolmn單元格，內容承載
space控制縮排
複製程式碼核心點
1. 核心元件row，通過元件遞迴自己實現樹形結構，並非用JSX方式
2. 通過v-html傳入函式，返回自定義html，實現單元格內容自定義
3. 通過H5的新特性draggable，實現拖拽，拖拽的同時需要匹配對應的行，並區分上／中／下，分別對應上移／下移／中間插入，並高亮，drop時對陣列進行重新排列，生成新的陣列
複製程式碼遞迴呼叫寫法如下
<template>
<div class="tree-block" draggable="true" @dragstart="dragstart($event)"
@dragend="dragend($event)">
<div class="tree-row"
@click="toggle"
:tree-id="model.id"
:tree-p-id="model.parent_id">
<column
v-for="(subItem, subIndex) in columns"
v-bind:class="'align-' + subItem.align"
:field="subItem.field"
:width="subItem.width"
:key="subIndex">
<span v-if="subItem.type === 'selection'">
<space :depth="depth"/>
<span v-if = "model.lists && model.lists.length" class="zip-icon" v-bind:class="[model.open ? 'arrow-bottom' : 'arrow-right']">
</span>
<span v-else class="zip-icon arrow-transparent">
</span>
<span v-if="subItem.formatter" v-html="subItem.formatter(model)"></span>
<span v-else v-html="model[subItem.field]"></span>
</span>
<span v-else-if="subItem.type === 'action'">
<a class="action-item"
v-for="(acItem, acIndex) in subItem.actions"
:key="acIndex"
type="text" size="small"
@click.stop.prevent="acItem.onclick(model)">
<i :class="acItem.icon" v-html="acItem.formatter(model)"></i>
</a>
</span>
<span v-else-if="subItem.type === 'icon'">
{{model[subItem.field]}}
</span>
<span v-else>
{{model[subItem.field]}}
</span>
</column>
<div class="hover-model" style="display: none">
<div class="hover-block prev-block">
<i class="el-icon-caret-top"></i>
</div>
<div class="hover-block center-block">
<i class="el-icon-caret-right"></i>
</div>
<div class="hover-block next-block">
<i class="el-icon-caret-bottom"></i>
</div>
</div>
</div>
<row
v-show="model.open"
v-for="(item, index) in model.lists"
:model="item"
:columns="columns"
:key="index"
:depth="depth * 1 + 1"
v-if="isFolder">
</row>
</div>
</template>
複製程式碼動態匹配實現
filter(x,y) {
var rows = document.querySelectorAll('.tree-row')
this.targetId = undefined
for(let i=0; i < rows.length; i++) {
const row = rows[i]
const rx = this.getElementLeft(row);
const ry = this.getElementTop(row);
const rw = row.clientWidth;
const rh = row.clientHeight;
if (x > rx && x < (rx + rw) && y > ry && y < (ry + rh)) {
const diffY = y - ry
const hoverBlock = row.children[row.children.length - 1]
hoverBlock.style.display = 'block'
const targetId = row.getAttribute('tree-id')
if (targetId == window.dragId){
this.targetId = undefined
return
}
this.targetId = targetId
let whereInsert = ''
var rowHeight = document.getElementsByClassName('tree-row')[0].clientHeight
if (diffY/rowHeight > 3/4) {
if (hoverBlock.children[2].style.opacity !== '0.5') {
this.clearHoverStatus()
hoverBlock.children[2].style.opacity = 0.5
}
whereInsert = 'bottom'
} else if (diffY/rowHeight > 1/4) {
if (hoverBlock.children[1].style.opacity !== '0.5') {
this.clearHoverStatus()
hoverBlock.children[1].style.opacity = 0.5
}
whereInsert = 'center'
} else {
if (hoverBlock.children[0].style.opacity !== '0.5') {
this.clearHoverStatus()
hoverBlock.children[0].style.opacity = 0.5
}
whereInsert = 'top'
}
this.whereInsert = whereInsert
}
}
}
複製程式碼更細的邏輯這裡不過多描述，感興趣可以看一下原始碼，也歡迎指出問題，一起優化,如果對你有幫助，也歡迎star