el-tree常用操作

一、定义

<el-treeclass="myTreeClass":data="dirTreeData":props="dirTreeProps":filter-node-method="filterDirTree":expand-on-click-node="false"node-key="id"@node-click="dirTreeNodeClick":allow-drop="dirTreeAllowDrop"@node-drop="dirTreeNodeDrop"ref="dirTreeRef"style="margin-top: 10px"draggable>
</el-tree>

• data:dirTreeData 数组
• props:dirTreeProps 可指定树的label/children等数据

  const dirTreeProps = ref({children:'children',label: function (node){return node.dirItem.name}
  })

二、插槽

插槽中可以定义icon、目录名称样式等数据

  <template #default="{ node,data }"><div style="display: flex;flex-grow:1"><div style="display: flex"><el-icon style="margin-right: 3px"><FolderOpened v-if="node.expanded" /><Folder v-else /></el-icon><div><div v-if="data.isEdit" style="margin-left: 8px"><el-input class="dirNameInput" v-model="data.dirItem.name" size="small" @blur="updateDirName(node)"></el-input></div><div v-else style="margin-left: 8px">{{node.label}}</div></div></div><div style="display:flex;margin-left: auto"><div>{{data.dirItem.countNow}}</div><div style="margin-left: 2px">({{data.dirItem.countAll}})</div></div></div></template>

三、拖拽目录限制判断

通过el-tree绑定:allow-drop="dirTreeAllowDrop"，实现对拖拽目标不能是根节点的限制

const dirTreeAllowDrop = (moveNode,inNode)=>{// 拖拽的目标节点不能是根节点return inNode.data.id !== rootNodeId.value;
}

四、拖拽目录完成后事件处理

通过el-tree绑定@node-drop="dirTreeNodeDrop"，实现对拖拽目标不能是根节点的限制

const dirTreeNodeDrop = (moveNode,inNode,type)=>{if (type === 'inner'){emitClickTreeNode(inNode)}else {emitClickTreeNode(moveNode)}
}

五、设置某个节点选中状态

dirTreeRef.value.setCurrentKey(targetNode.key)

六、调用某个节点点击事件

dirTreeRef.value.$emit('node-click',targetNode.data,targetNode,null)

 七、根据nodeId获取当前节点data数据

const findTreeDataById = (nodeId)=>{const traverse = (nodes)=>{for(const node of nodes){if (node.id === nodeId) return node;if (node.children && node.children.length > 0){const found = traverse(node.children)if (found) return found}}}return traverse(dirTreeData.value)
}

 八、根据nodeId获取父节点data数据 

const findParentTreeDataById = (nodeId)=>{const traverse = (nodes)=>{for(const node of nodes){if (node.children && node.children.length > 0){if (node.children.some(child=>child.id === nodeId)){return node;}const parentNode = traverse(node.children)if (parentNode) return parentNode}}}return traverse(dirTreeData.value)
}

九、根据nodeId获取Tree组件中当前节点node

const parentNode = dirTreeRef.value.getNode(parentData.id)

 十、新增目录

const addDir = async ()=>{if (!currentSelectedNode.value){ElMessage.error('未找当前节点，请刷新后重试')return}// 后台请求新增目录let newDir = {xxxx}const dirAddResp = await dirService.dirAdd(newDir)const {data:{data:dirAddId}} = dirAddRespif(!dirAddId){ElMessage.error('保存失败，未获取到新增目录id')return}// 增加对应树节点let newDirData = {id:dirAddId,dirItem:{id:dirAddId,name:'新建目录',countNew:0,countAll:0},isEdit:true,children:[]}currentSelectedNode.value.children.push(newDirData)await nextTick(()=>{// 展开其父节点const parentData = findParentTreeDataById(newDirData.id)const parentNode = dirTreeRef.value.getNode(parentData.id)parentNode.expand()// 定位到当前节点const newDirNode = dirTreeRef.value.getNode(newDirData.id)emitClickTreeNode(newDirNode)// 输入框焦点定位nextTick(()=>{setTimeout(()=>{const input = document.querySelector('.dirNameInput .el-input__inner')if (input){input.focus()}},500)})})
}

十一、删除目录

const deleteDir = async ()=>{// 后台请求删除节点const dirDeleteResp = await dirService.caseDirDelete(currentSelectedNode.value.id)const {data:{errno:respErrno}} = dirDeleteRespif (respErrno !== 0) {ElMessage.error('节点删除失败，请刷新后重试')return}// 从父节点中移除当前节点const parentData = findParentTreeDataById(currentSelectedNode.value.id)const index = parentData.children.indexOf(currentSelectedNode.value)parentData.children.splice(index,1)// 将焦点定位至父节点const parentNode = dirTreeRef.value.getNode(parentData.id)await nextTick(()=>{emitClickTreeNode(parentNode)})
}

 十二、目录重命名

 先把目录的输入框显示出来，并将焦点置于输入框

const editDirName = async ()=>{const treeData = findTreeDataById(currentSelectedNode.value.id)treeData.isEdit = trueawait nextTick(()=>{const input = document.querySelector('.dirNameInput .el-input__inner')if (input){input.focus()}})
}

然后再input @blur=updateDirName时，调用后台保存

const updateDirName = async(node)=>{// 后台请求重命名目录const dirRenameResp = await dirService.dirRename(node.data.id,node.data.dirItem.name)const {data:{errno:respErrno}} = dirRenameRespif (respErrno !== 0) {ElMessage.error('节点重命名失败，请刷新后重试')return}node.data.isEdit = false
}