【js】将一维数组处理成树形数据并且实现模糊查询

项目中由于数据量不大，后台并未做处理，因此前端拿到返回的Table数据需要处理成树形数据再渲染到表格中

原始数据

javascript">const dataList=[{"id": 44,"seedlingName": "测试2","seedlingType": "测试2","seedlingAge": 2,},{"id": 47,"seedlingName": "试","seedlingType": "1","seedlingAge": 1,},{"id": 45,"seedlingName": "试2","seedlingType": "2","seedlingAge": 2,},{"id": 43,"seedlingName": "试1","seedlingType": "12","seedlingAge": 12,},{"id": 49,"seedlingName": "试1","seedlingType": "1","seedlingAge": 222,},{"id": 50,"seedlingName": "试1","seedlingType": "试1","seedlingAge": 1,},{"id": 46,"seedlingName": "测试2","seedlingType": "测试3","seedlingAge": 3,},{"id": 42,"seedlingName": "测试2","seedlingType": "12","seedlingAge": 12,}
]

处理之后的数据(这里是按照名称做的归类[seedlingName])

javascript">const dataList=[{"id": 44,"seedlingName": "测试2","seedlingType": "测试2","seedlingAge": 2,"children": [{"id": 46,"seedlingName": "测试2","seedlingType": "测试3","seedlingAge": 3,   },{"id": 42,"seedlingName": "测试2","seedlingType": "12","seedlingAge": 12,}]},{"id": 47,"seedlingName": "试","seedlingType": "1","seedlingAge": 1,"children": []},{"id": 45,"seedlingName": "试2","seedlingType": "2","seedlingAge": 2,"children": []},{"id": 43,"seedlingName": "试1","seedlingType": "12","seedlingAge": 12,"children": [{"id": 49,"seedlingName": "试1","seedlingType": "1","seedlingAge": 222,},{"id": 50,"seedlingName": "试1","seedlingType": "试1","seedlingAge": 3,}]}
]

思路

备注：由于处理完之后会影响到原始数据，所以不能直接赋值，做一下数据的拷贝 _.cloneDeep（）

1. 先用map结构记录

javascript">function arrayToMap(data) {var map = {};for (var i = 0; i < data.length; i++) {let name = data[i].seedlingName;if (name != undefined) {if (map[name] == undefined) {map[name] = [];}map[name].push(data[i]);}}return map;}

2. 把map转成数组

javascript">//把map转成数组function mapToArray(data) {let array = [];for (let p in data) {array.push(data[p]);}return array;}

3. 循环之后取出每一个数组第一个元素作为根节点，后面的作为子级

javascript">function arrayToTree(array) {// 取出第一个元素作为根节点const root = array.shift();if (array.length) {root.children = array;} else {root.children = [];}return root;}

4. 调用

javascript">const treeArr = mapToArray(arrayToMap(dataList)).map((item) => {var tree = arrayToTree(item);return tree;});console.log(treeArr)

5. 实现模糊查询

这里查询的字段(seedlingName/seedlingAge/seedlingType),其中seedlingAge是数字类型，所以我在查询的时候将数字类型转成了字符串类型，使用indexOf实现此功能，然后将查询到的数据在转成树形结构

javascript">const tableFilter=ref([])
const selectParams = reactive({seedlingName: '',seedlingType: '',seedlingAge: '',
});tableFilter.value = _.cloneDeep(dataList); //dataList原始数据getFuzzyQuery(selectParams);const getFuzzyQuery = (params) => {const filterVal = tableFilter.value.filter((item) => {if (item.seedlingName.indexOf(params.seedlingName) !== -1 &&item.seedlingType.indexOf(params.seedlingType) !== -1 &&item.seedlingAge.toString().indexOf(params.seedlingAge) !== -1) {return item;}});tableData.value = getDisposeData(filterVal); //getDisposeData是将上面的处理封装了
};