JS前端二维数组生成树形结构示例详解
目录
问题描述
实现步骤
完整代码
问题描述前端在构建国家的省市区结构时，接口返回的不是树形结构，这个时候就需要我们进行转化。以下数据为例
[
[
{
"districtId": 1586533852834,
"parentCode": "000",
"nodeCode": "000001",
"name": "浙江省",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533872922,
"parentCode": "000001",
"nodeCode": "000001001",
"name": "杭州市",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533872940,
"parentCode": "000001001",
"nodeCode": "000001001001",
"name": "上城区",
"districtType": "HUADONG",
"districtTypeName": null
}
],
[
{
"districtId": 1586533852834,
"parentCode": "000",
"nodeCode": "000001",
"name": "浙江省",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533872922,
"parentCode": "000001",
"nodeCode": "000001001",
"name": "杭州市",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533872961,
"parentCode": "000001001",
"nodeCode": "000001001002",
"name": "下城区",
"districtType": "HUADONG",
"districtTypeName": null
}
],
[
{
"districtId": 1586533852834,
"parentCode": "000",
"nodeCode": "000001",
"name": "浙江省",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533872922,
"parentCode": "000001",
"nodeCode": "000001001",
"name": "杭州市",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533872980,
"parentCode": "000001001",
"nodeCode": "000001001003",
"name": "临安区",
"districtType": "HUADONG",
"districtTypeName": null
}
],
[
{
"districtId": 1586533852834,
"parentCode": "000",
"nodeCode": "000001",
"name": "浙江省",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533873196,
"parentCode": "000001",
"nodeCode": "000001002",
"name": "宁波市",
"districtType": "HUADONG",
"districtTypeName": null
}
],
[
{
"districtId": 1586533852834,
"parentCode": "000",
"nodeCode": "000001",
"name": "浙江省",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533873432,
"parentCode": "000001",
"nodeCode": "000001003",
"name": "温州市",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533873468,
"parentCode": "000001003",
"nodeCode": "000001003002",
"name": "平阳县",
"districtType": "HUADONG",
"districtTypeName": null
}
],
[
{
"districtId": 1586533852834,
"parentCode": "000",
"nodeCode": "000001",
"name": "浙江省",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533873432,
"parentCode": "000001",
"nodeCode": "000001003",
"name": "温州市",
"districtType": "HUADONG",
"districtTypeName": null
},
{
"districtId": 1586533873486,
"parentCode": "000001003",
"nodeCode": "000001003003",
"name": "文成县",
"districtType": "HUADONG",
"districtTypeName": null
}
]
]
[
{
"label": "浙江省",
"value": 1586533852834,
"parentCode": "000",
"nodeCode": "000001",
"children": [
{
"label": "杭州市",
"value": 1586533872922,
"parentCode": "000001",
"nodeCode": "000001001",
"children": [
{
"label": "上城区",
"value": 1586533872940,
"parentCode": "000001001",
"nodeCode": "000001001001"
},
{
"label": "下城区",
"value": 1586533872961,
"parentCode": "000001001",
"nodeCode": "000001001002"
},
{
"label": "临安区",
"value": 1586533872980,
"parentCode": "000001001",
"nodeCode": "000001001003"
}
]
},
{
"label": "宁波市",
"value": 1586533873196,
"parentCode": "000001",
"nodeCode": "000001002"
},
{
"label": "温州市",
"value": 1586533873432,
"parentCode": "000001",
"nodeCode": "000001003",
"children": [
{
"label": "平阳县",
"value": 1586533873468,
"parentCode": "000001003",
"nodeCode": "000001003002"
},
{
"label": "文成县",
"value": 1586533873486,
"parentCode": "000001003",
"nodeCode": "000001003003"
}
]
}
]
}
]
实现步骤
① 观察输入的数据结构为二维数组，每个数组中存储了省市区的全部数据，此时首先需要将二维数组一维化，以取得所有的节点数据，用于后续构建树形结构。
let arr = [].concat.apply([], data)
② 得到所有需要构建树形结构的数据后，发现数组中存在重复数据
arrayToTree(data, rootNode) {
let temp = {}
let reduceArr = data.reduce((current, next) => {
temp[next.districtId] ? "" : temp[next.districtId] = current.push(next)
return current
},[])
}
③ 数据规范化处理，把所有的数据处理成需要的节点数据
arrayToTree(data, rootNode) {
let temp = {}
let reduceArr = data.reduce((current, next) => {
temp[next.districtId] ? "" : temp[next.districtId] = current.push(next)
return current
},[])
// 2.数组规范化
let result = []
reduceArr.forEach(item => {
result.push({
label:item.name,
value:item.districtId,
parentCode:item.parentCode,
nodeCode:item.nodeCode,
children: []
})
})
}
④ 采用递归的方式构建树形结构
getTreeList(data, rootNode, list,{label, value,parentCode, nodeCode, children}) {
// 构建父节点
data.forEach(item =>{
if (item.parentCode === rootNode) {
list.push(item)
}
})
list.forEach(item => {
item.children = []
// 构建子节点
this.getTreeList(data, item.nodeCode, item.children,{label, value,parentCode, nodeCode, children});
// 删除空叶子节点
if (item.children.length === 0) {
delete item.children;
}
})
return list;
}
完整代码
arrayToTree(data, rootNode, {label = 'label', value = 'value',parentCode = 'parentCode', nodeCode = 'nodeCode', children = ''} = {}) {
// 1.数组去重
let temp = {}
let reduceArr = data.reduce((current, next) => {
temp[next.districtId] ? "" : temp[next.districtId] = current.push(next)
return current
},[])
// 2.数组规范化
let result = []
reduceArr.forEach(item => {
result.push({
label:item.name,
value:item.districtId,
parentCode:item.parentCode,
nodeCode:item.nodeCode,
children: []
})
})
// 3.构建树形结构
return this.getTreeList(result,rootNode,[],{
label,value,parentCode,nodeCode,children
});
},
// 递归构建树形结构
getTreeList(data, rootNode, list,{label, value,parentCode, nodeCode, children}) {
data.forEach(item =>{
if (item.parentCode === rootNode) {
list.push(item)
}
})
list.forEach(item => {
item.children = []
this.getTreeList(data, item.nodeCode, item.children,{label, value,parentCode, nodeCode, children});
if (item.children.length === 0) {
delete item.children;
}
})
return list;
},
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