Element-ui树形控件el-tree自定义增删改和局部刷新及懒加载操作
需求: vue-cli项目树形控件:一级节点为本地节点,默认展开一级节点,增删改后局部刷新数据。
增加节点,点击确定后局部刷新,渲染新数据。
源码
element组件样式
<el-tree class="treeitems" :data="data" node-key="id" :props="defaultProps" :load="loadNode" lazy :default-expanded-keys="[0]" @node-click="handleNodeClick" draggable :allow-drop="allowDrop" :allow-drag="allowDrag" @node-drop="handleDrop" ref="tree" > <span class="custom-tree-node" slot-scope="{ node, data }"> <span>{{ node.label }}</span> <span> <i @click="() => append(node,data)" class="el-icon-plus"></i><!--增加分组--> <!-- 根节点不需要删除和重命名 --> <i v-if="data.id !== 0" @click="() => deletes(node,data)" class="el-icon-delete"></i><!--删除分组--> <i v-if="data.id !== 0" @click="() => rename(node,data)" class="el-icon-edit"></i><!--重命名分组--> </span> </span> </el-tree>
data数据
data() { return { filterText: '', data: [{ id:0, label: '中国', }], children: [{ id:1, label: '北京', children: [{ id:11, label: '通州' }] }, { id:2, label: '上海', leaf: true, }, { id:3, label: '山西', children:[{ id: 13, label: '太原' },{ id: 14, label: '阳泉' }] },{ id:4, label: '黑龙江', children: [{ id:12, label: '哈尔滨' }] }], defaultProps: { children: 'children', label: 'label', isLeaf: 'leaf' } };
点击增加节点弹出弹窗
这里也用的是element的弹窗,直接在methods里写:
//点重命名事件 append(node,data) { console.log(node,data,'增加') this.$prompt('节点名字', '增加节点', { confirmButtonText: '确定', cancelButtonText: '取消', inputPattern: /^[\u4e00-\u9fa5]{0,}$/,//匹配全中文 inputErrorMessage: '请输入中文'//不符合正则匹配的提示语句 }).then(({ value }) => { //可以在这里发请求,http是我模拟的一个虚假的封装好的axios请求,()可写请求参数 http().then((data)=>{ this.$message({ type: 'success', message: '修改成功' }); //请求成功需局部刷新该节点,调用方法,把节点信息node传入 this.partialRefresh(node) }) //请求失败 .catch(()=>{ this.$message({ type: 'info', message: '修改失败' }); }) }).catch(() => { this.$message({ type: 'info', message: '取消修改' }); }); }, //实现局部刷新,在点击弹窗处调用的 partialRefreshpartialRefresh(node){ //设置loaded为false;模拟一次节点展开事件,加载重命名后的新数据; node.loaded = false; node.expand(); //新建子节点是刷新一次本节点的展开请求,而重命名和删除则需要刷新父级节点的的展开事件, //可以设置node.parent.loaded = false;node.parent.expand(); },
懒加载
该处可直接设置有无节点,如果后端返回有无节点的表示就可用,若无可舍弃。(data中写,我在本地模拟数据上海字段中加了leaf: true,上海节点就默认没有节点了)
//懒加载 loadNode(node, resolve){ if (node.level === 0) { //本地的数据,一个承载中国字样的数组; return resolve(this.data); } else if(node.level === 1){ //现在为模拟数据; //有真实数据,在resolve中放置请求回来的数据即可。 //else同样也是。我这里是区分了两种请求方式。 return resolve(this.children) } else{ return resolve([]) } },
拖拽节点
//拖拽==>拖拽时判定目标节点能否被放置 allowDrop(draggingNode, dropNode, type){ //参数:被拖拽节点,要拖拽到的位置 //因为根目录是我本地写死的,不能有同级,所以我设置凡是拖拽到的level===1都存放到根节点的下面; if(dropNode.level===1){ return type == 'inner'; } else { return true; } }, //拖拽==>判断节点能否被拖拽 allowDrag(draggingNode){ //第一级节点不允许拖拽 return draggingNode.level !== 1; },
需求改了,同级节点拖拽,拖拽完成后将排序结果返回后端:
//拖拽==>拖拽时判定目标节点能否被放置 //后更改为只能同级拖拽 allowDrop(draggingNode, dropNode, type) { if (draggingNode.level === dropNode.level) { if (draggingNode.data.parentId === dropNode.data.parentId) { return type === 'prev' || type === 'next' } } else { // 不同级不允许拖拽 return false } }, //拖拽==>判断节点能否被拖拽 allowDrag(draggingNode) { return draggingNode.level !== 1; }, //拖拽成功完成时触发的事件,在这里可以将节点拖拽后的顺序返给后端 handleDrop(node,data,type,event){ let arr=[]; //data为拖拽后节点信息,找到它的父级,在从父级找子集 let child = data.parent.childNodes; for(var key in child){ arr.push({id:child[key].data.id}) } //转为JSON字符串发请求带走信息 idSort(JSON.stringify(arr)) }
补充知识:vue+element tree ----增加修改删除上下移动
<template> <div> <div class="exam_structure"> <el-input placeholder="输入关键字进行过滤" v-model="filterText"> </el-input> <el-button type="primary" size="small" class="add_new_question" @click="add_new_question"><i></i>添加父节点</el-button> </div> <div class="question_info_lists"> <el-tree ref="tree" :key="tree_key" :data="treeData" node-key="id" :render-content="renderContent" :expand-on-click-node="false" :default-expanded-keys="defaultExpand" show-checkbox :filter-node-method="filterNode"></el-tree> <el-row class="add_question" v-show="add_question_flag"> <el-col :span="12"> <el-input v-model="new_question_name" placeholder="请输入大题名称"></el-input> </el-col> <el-col :span="12"> <el-button size="mini" class="btn_sure" @click.stop="add_question_sure">确定</el-button> <el-button size="mini" class="btn_cancel" @click.stop="add_question_cancel">取消</el-button> </el-col> </el-row> </div> </div> </template> <script> export default { name: "tree1", watch: { filterText(val) { this.$refs.tree.filter(val); } }, methods: { filterNode(value, data) { if (!value) return true; return data.label.indexOf(value) !== -1; }, // 添加新大题 add_new_question() { this.add_question_flag = true }, add_question_sure() { //确定 const nodeObj = {id: '', label: this.new_question_name, isEdit: false, children: []} this.treeData.push(nodeObj) this.add_question_flag = false }, add_question_cancel() { //取消 this.add_question_flag = false this.new_question_name = '' }, // 增加 append(store, node, data) { var maxid = '20' //新增数据 const nodeapp = {id: ++maxid, label: '增加节点', isEdit: false, children: []} data.children.push(nodeapp) if (!node.expanded) { node.expanded = true } const parent = node.parent const children = parent.data const cIndex = children.findIndex(d => d.id === data.id) const tempChildrenNodex2 = children[cIndex] //拿到被添加的上一级 console.log(tempChildrenNodex2.children[cIndex - 1]) }, // 修改 nodeEdit(ev, store, data) { data.isEdit = true this.$nextTick(() => { const $input = ev.target.parentNode.parentNode.querySelector('input') || ev.target.parentElement.parentElement.querySelector('input') !$input ? '' : $input.focus() }) }, edit_sure(ev, data) { const $input = ev.target.parentNode.parentNode.querySelector('input') || ev.target.parentElement.parentElement.querySelector('input') if (!$input) { return false } else { data.label = $input.value data.isEdit = false } }, // 节点删除 nodeDelete(node, data) { const parent = node.parent const children = parent.data.children || parent.data const index = children.findIndex(d => d.id === data.id) children.splice(index, 1) }, // 节点上移 nodeUp(node, data) { const parent = node.parent const children = parent.data.children || parent.data const cIndex = children.findIndex(d => d.id === data.id) if (parent.level === 0 && cIndex === 0) { return } else if (parent.level !== 0 && cIndex === 0) { //不同父节点中移动 alert('不同父节点中移动') // const parent2 = parent.parent // const children2 = parent2.data.children || parent2.data // const pIndex2 = parseInt(children2.findIndex(p => p.id === parent.data.id), 10) - 1 // if (pIndex2 < 0) return // children2[pIndex2].children.push(data) // children.splice(cIndex, 1) // this.defaultExpand[0] = children2[pIndex2].id } else if ((parent.level === 0 && cIndex !== 0) || (parent.level !== 0 && cIndex !== 0)) { const tempChildrenNodex1 = children[cIndex - 1] const tempChildrenNodex2 = children[cIndex] this.$set(children, cIndex - 1, tempChildrenNodex2) this.$set(children, cIndex, tempChildrenNodex1) this.defaultExpand[0] = data.id } this.tree_key++ }, // 节点下移 nodeDown(store, node, data) { const parent = node.parent const children = parent.data.children || parent.data const cIndex = children.findIndex(d => d.id === data.id) const cLength = children.length - 1 // 最边上的节点 const allLevel = store.data.length - 1 // 树的深度 if (parent.level === allLevel && cIndex === cLength) { // 最最末的节点 return } else if (parent.level !== allLevel && cIndex === cLength) { //父节点不同 alert('不能移动') // const parent2 = parent.parent // const children2 = parent2.data.children || parent2.data // const pIndex2 = parseInt((children2.findIndex(p => p.id === parent.data.id)), 10) // if (pIndex2 === allLevel) return // children2[pIndex2 + 1].children.push(data) // children.splice(cIndex, 1) // this.defaultExpand[0] = children2[pIndex2 + 1].id } else if ((parent.level === allLevel && cIndex !== cLength) || (parent.level !== allLevel && cIndex !== cLength)) { // 父节点相同 const tempChildrenNodex1 = children[cIndex + 1] const tempChildrenNodex2 = children[cIndex] this.$set(children, cIndex + 1, tempChildrenNodex2) this.$set(children, cIndex, tempChildrenNodex1) this.defaultExpand[0] = data.id } this.tree_key++ }, showOrEdit(data) { if (data.isEdit) { return <input type="text" value={data.label} on-blur={ev => this.edit_sure(ev, data)}/> } else { return <span className="node_labe">{data.label}</span> } }, // 结构树操作group node, renderContent(h, {node, data, store}) { return ( <span> <span class="el-icon-document"> {this.showOrEdit(data)} </span> <div class="tree_node_op" style=" float: right"> <i class="el-icon-edit" on-click={(ev) => this.nodeEdit(ev, store, data)}></i> <i class="el-icon-delete" on-click={() => this.nodeDelete(node, data)}></i> <i class="el-icon-upload2" on-click={() => this.nodeUp(node, data)}></i> <i class="el-icon-download" on-click={() => this.nodeDown(store, node, data)}></i> <i class="el-icon-plus" on-click={() => this.append(store, node, data)}></i> </div> </span>) } } , data() { return { filterText: '', treeData: [{ id: 1, label: '一级 1', isEdit: false, children: [{ id: 4, label: '二级 1-1', isEdit: false, children: [{id: 9, label: '三级 1-1-1', isEdit: false, children: []}, { id: 10, label: '三级 1-1-2', isEdit: false, children: [] }, { id: 11, label: '三级 1-1-3', isEdit: false, children: [] }] }, { id: 12, label: '二级 1-2', isEdit: false, children: [] }, { id: 13, label: '二级 1-3', isEdit: false, children: [] }] }, { id: 2, label: '一级 2', isEdit: false, children: [{id: 5, label: '二级 2-1', isEdit: false, children: []}, { id: 6, label: '二级 2-2', isEdit: false, children: [] }] }, { id: 3, label: '一级 3', isEdit: false, children: [ {id: 7, label: '二级 3-1', isEdit: false, children: []}, { id: 8, label: '二级 3-2', isEdit: false, children: [] }] }], add_question_flag: false, new_question_name: '', tree_key: 0, defaultExpand: [] } }, } </script> <style scoped> </style>
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