前言
平时我们可能在做项目时，会遇到一个业务逻辑。实现一个无限级联树形表格，什么叫做无限级联树形表格呢？就是下图所展示的内容，有一个祖元素，然后下面可能有很多子孙元素，你可以实现添加、编辑、删除这样几个功能。
资源
- JavaScript框架：vue.js
- UI框架：Element UI
源码
这里需要重点说明的是，主要使用了递归的算法以及给数据标识的重要性。详细说明可以在源码中查看注释，也可以通过删改代码融会贯通。
代码语言：javascript复制<template>
<div class="container">
<div class="btn-r">
<el-button
type="primary"
size="small"
@click="addView = true"
icon="el-icon-circle-plus-outline"
class="add"
>添加</el-button
>
</div>
<el-table
:data="tableData"
style="width: 100%; margin-bottom: 20px"
row-key="value"
border
default-expand-all
size="medium"
:tree-props="{ children: 'children', hasChildren: 'hasChildren' }"
>
<el-table-column prop="label" label="名称" sortable>
</el-table-column>
<el-table-column label="操作" align="center" width="180">
<template slot-scope="scope">
<el-button
type="text"
size="small"
@click="handleClick(scope.row, scope.$index)"
>编辑</el-button
>
<el-button
type="text"
size="small"
@click="deleteClick(scope.row, scope.$index)"
>删除</el-button
>
</template>
</el-table-column>
</el-table>
<!-- 添加窗口 -->
<el-dialog
title="添加"
:visible.sync="addView"
:close-on-click-modal="false"
width="30%"
@close="closeView"
>
<el-form :model="form" ref="form" :rules="rules">
<el-form-item
label="位置"
:label-width="formLabelWidth"
prop="location"
>
<el-select
v-model="form.location"
placeholder="请选择位置"
@change="locationChange"
size="small"
>
<el-option
v-for="item in locationData"
:key="item.id"
:label="item.name"
:value="item.id"
/>
</el-select>
</el-form-item>
<el-form-item
v-if="sonStatus"
label="子位置"
:label-width="formLabelWidth"
prop="childArr"
>
<el-cascader
size="small"
:key="isResouceShow"
v-model="form.childArr"
placeholder="请选择子位置"
:label="'name'"
:value="'id'"
:options="tableData"
:props="{ checkStrictly: true }"
clearable
@change="getCasVal"
></el-cascader>
</el-form-item>
<el-form-item
label="名称"
:label-width="formLabelWidth"
prop="label"
>
<el-input
v-model="form.label"
size="small"
autocomplete="off"
placeholder="请输入名称"
></el-input>
</el-form-item>
</el-form>
<span slot="footer" class="dialog-footer">
<el-button @click="addView = false" size="small"
>取 消</el-button
>
<el-button type="primary" @click="okAdd('form')" size="small"
>确 定</el-button
>
</span>
</el-dialog>
<!-- 编辑窗口 -->
<el-dialog
title="编辑"
:visible.sync="editView"
:close-on-click-modal="false"
width="30%"
>
<el-form :model="data" ref="data" :rules="rules">
<el-form-item
label="位置"
:label-width="formLabelWidth"
prop="location"
>
<el-select
v-model="data.location"
placeholder="请选择位置"
size="small"
@change="locationChange"
>
<el-option
v-for="item in locationData"
:key="item.id"
:label="item.name"
:value="item.id"
/>
</el-select>
</el-form-item>
<el-form-item
v-if="sonStatus"
label="子位置"
:label-width="formLabelWidth"
prop="childArr"
>
<el-cascader
:key="isResouceShow"
v-model="data.childArr"
placeholder="请选择子位置"
size="small"
:label="'name'"
:value="'id'"
:options="tableData"
:props="{ checkStrictly: true }"
clearable
@change="getCasVal"
></el-cascader>
</el-form-item>
<el-form-item
label="名称"
:label-width="formLabelWidth"
prop="label"
>
<el-input
v-model="data.label"
autocomplete="off"
placeholder="请输入名称"
size="small"
></el-input>
</el-form-item>
</el-form>
<span slot="footer" class="dialog-footer">
<el-button @click="editView = false" size="small"
>取 消</el-button
>
<el-button type="primary" @click="okEdit('data')" size="small"
>确 定</el-button
>
</span>
</el-dialog>
</div>
</template>
<script>
export default {
name: 'Tag',
data() {
return {
location: '',
isResouceShow: 1,
addView: false,
sonStatus: false,
editView: false,
casArr: [],
childArr: [],
form: {},
data: {},
idx: '',
childkey: [],
formLabelWidth: '80px',
rules: {
label: [
{ required: true, message: '请输入名称', trigger: 'blur' }
]
},
locationData: [
{
id: 1,
name: '顶'
},
{
id: 2,
name: '子'
}
],
tableData: []
};
},
methods: {
// 监听关闭窗口
closeView() {
this.$refs['form'].resetFields(); // 关闭窗口，清空填写的内容
},
// 打开编辑
handleClick(item, index) {
item.value.length != 1
? (this.sonStatus = true)
: (this.sonStatus = false);
this.editView = true;
const obj = Object.assign({}, item);
this.childkey = item.childkey;
this.casArr = item.childArr;
this.idx = index;
this.data = obj;
},
// 递归表格数据(编辑)
findSd(arr, i, casArr) {
if (i == casArr.length - 1) {
let index = casArr[i].substr(casArr[i].length - 1, 1);
return arr.splice(index, 1, this.data);
} else {
return this.findSd(
arr[casArr[i].substr(casArr[i].length - 1, 1)].children,
(i = 1),
casArr
);
}
},
// 确定编辑
okEdit(data) {
this.$refs[data].validate(valid => {
if (valid) {
if (this.data.value.length == 1) {
this.tableData.splice(this.idx, 1, this.data);
this.$message({
type: 'success',
message: '编辑成功'
});
this.editView = false;
} else {
this.findSd(this.tableData, 0, this.childkey);
this.$message({
type: 'success',
message: '编辑成功'
});
this.editView = false;
}
} else {
return false;
}
});
},
// 递归表格数据(删除)
findDel(arr, i, item) {
let casArr = item.childkey;
if (i == casArr.length - 1) {
let index = casArr[i].substr(casArr[i].length - 1, 1);
return arr.splice(index, 1);
} else {
return this.findDel(
arr[casArr[i].substr(casArr[i].length - 1, 1)].children,
(i = 1),
item
);
}
},
// 删除
deleteClick(item) {
this.$confirm(`此操作将删除该项, 是否继续?`, '提示', {
confirmButtonText: '确定',
cancelButtonText: '取消',
type: 'warning'
})
.then(() => {
if (item.children.length != 0) {
this.$message.warning({
message: '请删除子节点',
duration: 1000
});
} else {
this.casArr = item.childArr;
this.isResouceShow; // 给级联控件绑定一个key，防止报错。
if (item.value.length == 1) { // 删除的是顶节点
console.log(1);
this.tableData.splice(item.value, 1);
this.$message({
type: 'success',
message: '删除成功'
});
} else { // 删除的是子节点
console.log(2);
this.findDel(this.tableData, 0, item);
this.$message({
type: 'success',
message: '删除成功'
});
}
}
})
.catch(err => {
console.log(err);
this.$message({
type: 'info',
message: '已取消删除'
});
});
},
// 是否显示次位置
locationChange(v) {
if (v == 2) {
this.sonStatus = true;
} else {
this.sonStatus = false;
}
},
// 获取次位置
getCasVal(v) {
this.casArr = v;
this.form.childArr = v;
},
// 递归表格数据(添加)
find(arr, i) {
if (i == this.casArr.length - 1) {
return arr[this.casArr[i].substr(this.casArr[i].length - 1, 1)]
.children;
} else {
return this.find(
arr[this.casArr[i].substr(this.casArr[i].length - 1, 1)]
.children,
(i = 1)
);
}
},
// 确定添加
okAdd(form) {
this.$refs[form].validate(valid => {
if (valid) {
if (this.sonStatus == false) {
this.form.value = String(this.tableData.length);
const obj = Object.assign({}, this.form);
obj.children = [];
obj.childArr = [];
this.tableData.push(obj);
this.$message({
type: 'success',
message: '添加成功'
});
this.addView = false;
} else {
let arr = this.find(this.tableData, 0);
this.childArr = [...this.casArr, String(arr.length)];
this.form.value =
String(this.casArr[this.casArr.length - 1])
String(arr.length);
delete this.form.children;
const obj = Object.assign({}, this.form);
obj.children = [];
obj.childkey = [...this.casArr, String(arr.length)];
arr.push(obj);
this.$message({
type: 'success',
message: '添加成功'
});
this.addView = false;
}
} else {
return false;
}
});
}
}
};
</script>
<style lang="scss" scoped>
::v-deep .el-form-item__content {
width: 203px;
}
</style>
