el-tree树添加向下移动按钮,前端界面调整顺序
需求:树上添加向下按钮,再不调用接口的情况下,调整树的顺序结构
遇到的问题:第一次点击更新的,数据和视图是调整好的,再次点击页面调整顺序,只有数据被调整了,视图没有发生改变。
<el-tree
ref="tree"
:data="treeData"
highlight-current
node-key="id"
:props="props"
:default-expanded-keys="showList"
@node-click="clicktree"
>
<span slot-scope="{node, data }" class="custom-tree-node">
<img v-if="data.seq_img" :src="hanleImgShow(data?.seq_img)" width="20" height="20">
<span style="display:inline-block;padding-left:5px;">{{ data?.seq_name_chn }}</span>
<el-button v-if="data.seq_img" type="text" icon="el-icon-arrow-down" @click="moveDown(node,data,data?.seq_num)" />
</span>
</el-tree>
moveDown(node, data, num) {
const seqNum = Number(num)
const childrenLength = node.parent.data.children.length
const childrenList = node?.parent?.data?.children
// seqNum 这个值去判断
if (childrenLength == seqNum) {
return this.$message.warning('不可以下移')
}
const treeList = this.treeCreatedData // 存放数据的, 这个里面的children是存放的序数据
const targetIndex = childrenList.findIndex(item => item.seq_num == num)
if (targetIndex !== -1) {
this.moveItemAndUpdateSeqNum(childrenList, targetIndex) // 将第三项移动到第一位
}
},
moveItemAndUpdateSeqNum(list, index) {
if (index < list.length - 1 && index >= 0) {
const temp = list[index]
list[index] = list[index + 1]
list[index + 1 ] = temp
this.$nextTick(() => {
for (let i = index; i <= index + 1; i++) {
list[i].seq_num = (i + 1).toString()
}
console.log(list, 'list382')
this.treeCreatedData[0].children[0].children = list
this.treeData = this.treeCreatedData
this.$forceUpdate()
})
}
},
这样写,只会更新第一次的视图,后续点击 视图没有发生改变;最后找到的方法是使用ref找树的方法 去修改。
moveItemAndUpdateSeqNum(list, index) {
if (index < list.length - 1 && index >= 0) {
const temp = list[index]
list[index] = list[index + 1]
list[index + 1 ] = temp
this.$nextTick(() => {
for (let i = index; i <= index + 1; i++) {
list[i].seq_num = (i + 1).toString()
}
console.log(list, 'list382')
this.treeCreatedData[0].children[0].children = list
this.treeData = this.treeCreatedData
this.$refs.tree.root.setData(this.treeData) //使用这个 去更新树节点的数据
})
}
},
原文地址:https://blog.csdn.net/dy1717/article/details/140661814
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