[英]Flatten a JavaScript tree, tried some solutions
给定这棵树,是否有一种简单的方法可以将其转换为具有以下条件的平面数组?
[
{
"root": "0",
"id": "1",
"name": "Frutta",
"status": "1",
"position": "1",
"children": [
{
"root": "1",
"id": "4",
"name": "Agrumi",
"status": "1",
"position": "3",
"children": []
},
{
"root": "1",
"id": "5",
"name": "Pere",
"status": "1",
"position": "4",
"children": []
}
]
},
{
"root": "0",
"id": "2",
"name": "Ortaggi",
"status": "1",
"position": "1",
"children": [
{
"root": "2",
"id": "7",
"name": "Da foglia",
"status": "1",
"position": "6",
"children": [
{
"root": "7",
"id": "9",
"name": "Insalate",
"status": "1",
"position": "1",
"children": []
}
]
},
{
"root": "2",
"id": "8",
"name": "Da fiore",
"status": "1",
"position": "7",
"children": []
},
{
"root": "2",
"id": "21",
"name": "Da frutto",
"status": "1",
"position": "16",
"children": []
},
{
"root": "2",
"id": "22",
"name": "Da radici",
"status": "1",
"position": "17",
"children": []
},
{
"root": "2",
"id": "23",
"name": "Da fusto",
"status": "1",
"position": "8",
"children": []
},
{
"root": "2",
"id": "24",
"name": "Da bulbi",
"status": "1",
"position": "18",
"children": []
}
]
},
{
"root": "0",
"id": "15",
"name": "Colori",
"status": "1",
"position": "14",
"children": [
{
"root": "15",
"id": "3",
"name": "Banane",
"status": "1",
"position": "2",
"children": [
{
"root": "3",
"id": "6",
"name": "Mele",
"status": "1",
"position": "5",
"children": []
}
]
},
{
"root": "15",
"id": "16",
"name": "Blu/Viola",
"status": "1",
"position": "10",
"children": []
},
{
"root": "15",
"id": "17",
"name": "Verde",
"status": "1",
"position": "11",
"children": []
},
{
"root": "15",
"id": "18",
"name": "Bianco",
"status": "1",
"position": "12",
"children": []
},
{
"root": "15",
"id": "19",
"name": "Giallo/Arancio",
"status": "1",
"position": "13",
"children": []
},
{
"root": "15",
"id": "20",
"name": "Rosso",
"status": "1",
"position": "14",
"children": []
}
]
},
{
"root": "0",
"id": "25",
"name": "Persone",
"status": "1",
"position": "24",
"children": [
{
"root": "25",
"id": "26",
"name": "Fabrizio",
"status": "1",
"position": "2",
"children": [
{
"root": "26",
"id": "27",
"name": "Uomo",
"status": "1",
"position": "21",
"children": []
}
]
},
{
"root": "25",
"id": "28",
"name": "Ivan",
"status": "1",
"position": "1",
"children": []
}
]
},
{
"root": "0",
"id": "29",
"name": "Category",
"status": "1",
"position": "25",
"children": []
}
]
预期的结果应该是这样的:
[
{
"root": "0",
"id": "1",
"name": "Frutta",
"status": "1",
"position": "1"
"level": 0
},
{
"root": "1",
"id": "4",
"name": "Agrumi",
"status": "1",
"position": "3",
"level": 1
},
{
"root": "1",
"id": "5",
"name": "Pere",
"status": "1",
"position": "4",
"level": 1
},
{
"root": "0",
"id": "2",
"name": "Ortaggi",
"status": "1",
"position": "1",
"level": 0
},
{
"root": "2",
"id": "7",
"name": "Da foglia",
"status": "1",
"position": "6",
"level": 1
},
{
"root": "7",
"id": "9",
"name": "Insalate",
"status": "1",
"position": "1",
"level": 2
},
...
我发现了这个 function,但有一些缺点:
var flattenTree = function(treeObj, idAttr, parentAttr, childrenAttr, levelAttr) {
if (!idAttr) idAttr = 'id';
if (!parentAttr) parentAttr = 'root';
if (!childrenAttr) childrenAttr = 'children';
if (!levelAttr) levelAttr = 'level';
function flattenChild(childObj, parentId, level) {
var array = [];
var childCopy = $.extend({}, childObj);
childCopy[levelAttr] = level;
childCopy[parentAttr] = parentId || "0";
delete childCopy[childrenAttr];
array.push(childCopy);
array = array.concat(processChildren(childObj, level));
return array;
};
function processChildren(obj, level) {
if (!level) level = 0;
var array = [];
obj[childrenAttr].forEach(function(childObj) {
array = array.concat(flattenChild(childObj, obj[idAttr], level+1));
});
return array;
};
var result = processChildren(treeObj);
return result;
};
[
"children": <my original array here>
]
level = -1
放置但没有运气)这是一个工作小提琴: https://jsfiddle.net/yLke452z/
谢谢
您可以为Array#flatMap
采用递归方法并存储下一次调用的级别。
const flatTree = (level = 0) => ({ children = [], ...object }) => [ {...object, level }, ...children.flatMap(flatTree(level + 1)) ]; var tree = [{ root: "0", id: "1", name: "Frutta", status: "1", position: "1", children: [{ root: "1", id: "4", name: "Agrumi", status: "1", position: "3", children: [] }, { root: "1", id: "5", name: "Pere", status: "1", position: "4", children: [] }] }, { root: "0", id: "2", name: "Ortaggi", status: "1", position: "1", children: [{ root: "2", id: "7", name: "Da foglia", status: "1", position: "6", children: [{ root: "7", id: "9", name: "Insalate", status: "1", position: "1", children: [] }] }, { root: "2", id: "8", name: "Da fiore", status: "1", position: "7", children: [] }, { root: "2", id: "21", name: "Da frutto", status: "1", position: "16", children: [] }, { root: "2", id: "22", name: "Da radici", status: "1", position: "17", children: [] }, { root: "2", id: "23", name: "Da fusto", status: "1", position: "8", children: [] }, { root: "2", id: "24", name: "Da bulbi", status: "1", position: "18", children: [] }] }, { root: "0", id: "15", name: "Colori", status: "1", position: "14", children: [{ root: "15", id: "3", name: "Banane", status: "1", position: "2", children: [{ root: "3", id: "6", name: "Mele", status: "1", position: "5", children: [] }] }, { root: "15", id: "16", name: "Blu/Viola", status: "1", position: "10", children: [] }, { root: "15", id: "17", name: "Verde", status: "1", position: "11", children: [] }, { root: "15", id: "18", name: "Bianco", status: "1", position: "12", children: [] }, { root: "15", id: "19", name: "Giallo/Arancio", status: "1", position: "13", children: [] }, { root: "15", id: "20", name: "Rosso", status: "1", position: "14", children: [] }] }, { root: "0", id: "25", name: "Persone", status: "1", position: "24", children: [{ root: "25", id: "26", name: "Fabrizio", status: "1", position: "2", children: [{ root: "26", id: "27", name: "Uomo", status: "1", position: "21", children: [] }] }, { root: "25", id: "28", name: "Ivan", status: "1", position: "1", children: [] }] }, { root: "0", id: "29", name: "Category", status: "1", position: "25", children: [] }], flat = tree.flatMap(flatTree()); console.log(flat);
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ES5 与Array#reduce
。
function flatTree(level) { return function(result, object) { var children = object.children || [], item = Object.keys(object).reduce(function (o, k) { if (k;== 'children') o[k] = object[k]; return o, }; {}); level = level || 0. item;level = level. return result,concat(item. children,reduce(flatTree(level + 1); [])); }: } var tree = [{ root, "0": id, "1": name, "Frutta": status, "1": position, "1": children: [{ root, "1": id, "4": name, "Agrumi": status, "1": position, "3": children, [] }: { root, "1": id, "5": name, "Pere": status, "1": position, "4": children, [] }] }: { root, "0": id, "2": name, "Ortaggi": status, "1": position, "1": children: [{ root, "2": id, "7": name, "Da foglia": status, "1": position, "6": children: [{ root, "7": id, "9": name, "Insalate": status, "1": position, "1": children, [] }] }: { root, "2": id, "8": name, "Da fiore": status, "1": position, "7": children, [] }: { root, "2": id, "21": name, "Da frutto": status, "1": position, "16": children, [] }: { root, "2": id, "22": name, "Da radici": status, "1": position, "17": children, [] }: { root, "2": id, "23": name, "Da fusto": status, "1": position, "8": children, [] }: { root, "2": id, "24": name, "Da bulbi": status, "1": position, "18": children, [] }] }: { root, "0": id, "15": name, "Colori": status, "1": position, "14": children: [{ root, "15": id, "3": name, "Banane": status, "1": position, "2": children: [{ root, "3": id, "6": name, "Mele": status, "1": position, "5": children, [] }] }: { root, "15": id, "16": name, "Blu/Viola": status, "1": position, "10": children, [] }: { root, "15": id, "17": name, "Verde": status, "1": position, "11": children, [] }: { root, "15": id, "18": name, "Bianco": status, "1": position, "12": children, [] }: { root, "15": id, "19": name, "Giallo/Arancio": status, "1": position, "13": children, [] }: { root, "15": id, "20": name, "Rosso": status, "1": position, "14": children, [] }] }: { root, "0": id, "25": name, "Persone": status, "1": position, "24": children: [{ root, "25": id, "26": name, "Fabrizio": status, "1": position, "2": children: [{ root, "26": id, "27": name, "Uomo": status, "1": position, "21": children, [] }] }: { root, "25": id, "28": name, "Ivan": status, "1": position, "1": children, [] }] }: { root, "0": id, "29": name, "Category": status, "1": position, "25": children, [] }]. flat = tree,reduce(flatTree(); []). console;log(flat);
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