基於Vue實現能夠拖拽排序的樹形表格（已開源）

項目須要一個能夠拖拽排序的樹形表格，github上搜了一下，併爲找到，大部分都不支持拖拽，因此本身實現了一個簡單的組件，已開源 源代碼在這裏，併發布到npm上，若是有相似需求能夠試一下，chrome上沒有任何問題

效果圖以下：

drag-tree-table

使用方式

---

npm i drag-tree-table --save-dev
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import dragTreeTable from 'drag-tree-table'
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<dragTreeTable :data="treeData" :onDrag="onTreeDataChange"></dragTreeTable>
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// state
treeData: {
  lists: [],
  columns: []
}
// methods
onTreeDataChange(list) {
  this.treeData.lists = list
},
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數據源（lists）配置

參數	可選值	描述
id	String	惟一標誌
parent_id	String	父節點ID
order	Number	排序,0開始,onDrag後order會重置
name	String	默認顯示內容
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":[]
 }
]
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列（columns）配置

參數	可選值	描述
type	'selection', 'actions'	selection會顯示摺疊圖標，actions指操做欄
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，默認局左對齊
formatter	Function	自定義單元格顯示內容,參數爲當前行數據

columns 配置示例

[
 {
   type: 'selection',
   title: '菜單名稱',
   field: 'name',
   width: 200,
   align: 'center',
   formatter: (item) => {
     return '<a>'+item.name+'</a>'
   }
 },
 {
   title: '連接',
   field: 'url',
   width: 200,
   align: 'center'
 },
 {
   title: '操做',
   type: 'action',
   width: 350,
   align: 'center',
   actions: [
     {
       text: '查看角色',
       onclick: this.onDetail,
       formatter: (item) => {
         return '<i>查看角色</i>'
       }
     },
     {
       text: '編輯',
       onclick: this.onEdit,
       formatter: (item) => {
         return '<i>編輯</i>'
       }
     }
   ]
 },
]
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實現原理

---

組件結構

dragTreeTable.vue是入口組件，定義總體結構
row是遞歸組件（核心組件）
clolmn單元格，內容承載
space控制縮進
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核心點

1. 核心組件row，經過組件遞歸本身實現樹形結構，並不是用JSX方式
2. 經過v-html傳入函數，返回自定義html，實現單元格內容自定義
3. 經過H5的新特性draggable，實現拖拽，拖拽的同時須要匹配對應的行，並區分上／中／下，分別對應上移／下移／中間插入，並高亮，drop時對數組進行從新排列，生成新的數組
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遞歸調用寫法以下

<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>&nbsp;
                        </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>
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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
          }
        }
      }
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更細的邏輯這裏不過多描述，感興趣能夠看一下源代碼，也歡迎指出問題，一塊兒優化,若是對你有幫助，也歡迎star