如何在 Javascript 中使用子对象值动态查找父 JSON 对象值?

Question

var obj = [
{
"name": "A1",
"children": [
{
"name": "A1-level1-child1",
"children": [
{
"name": "A1-level2-child1",
"children": [
{
"name": "A1-level3-child1",
"children": []
},
{
"name": "A1-level3-child2",
"children": []
}
]
}
]
},
{
"name": "A2-level1-child1",
"children": []
}
]   
},
{
"name": "B1",
"children": [
]   
}

];

从上面的 JSON 对象中，如果我检查值"A1-level3-child1"，该函数应将其父名称作为"A1-level2-child1"。同样，如果我检查"A2-level1-child1"，那么它应该给我父值为"A1"。

Answer 1

您可以迭代数组或子级，如果找到节点，则使用短路。

function getParentName(array, name, parent = 'root') {
var result;
array.some(o => result = o.name === name && parent
|| o.children && getParentName(o.children, name, o.name));
return result;
}
var array = [{ name: "A1", children: [{ name: "A1-level1-child1", children: [{ name: "A1-level2-child1", children: [{ name: "A1-level3-child1", children: [] }, { name: "A1-level3-child2", children: [] }] }] }, { name: "A2-level1-child1", children: [] }] }, { name: "B1", children: [] }];
console.log(getParentName(array, "A1-level3-child1")); // A1-level2-child1
console.log(getParentName(array, "A2-level1-child1")); // A1

Answer 2

GoGo 这段代码。

var parentMap = {}
function getParentMap(arr, parent) {
if (!(arr instanceof Array)) {
return;
}
for (o of arr) {
parentMap[o.name] = parent;
if (o.children && o.children.length) {
getParentMap(o.children, o);
//getParentMap(o.children, o.name);
}
}
}
var arr = [{
"name": "A1",
"children": [{
"name": "A1-level1-child1",
"children": [{
"name": "A1-level2-child1",
"children": [{
"name": "A1-level3-child1",
"children": []
},
{
"name": "A1-level3-child2",
"children": []
}
]
}]
},
{
"name": "A2-level1-child1",
"children": []
}
]
},
{
"name": "B1",
"children": []
}];
getParentMap(obj, null);
parentMap["A1-level3-child1"].name

Answer 3

如果可以重新定义此结构，则可以在每个节点上添加"parent"，以便于操作。