我有一個嵌套物件,沒有可預先確定的子物件路徑 - 例如:
{
children :
[
{
children :
[
{
children :
[
{
id : "F100517B-D00F",
level : 4,
note : "update me",
parentId : "23A2A0DB-CCE3",
title : "change me"
}
],
id : "23A2A0DB-CCE3",
level : 3,
note : "me too",
parentId : "a0H4H00000Roi",
title : "..and me"
}
],
id : "a0H4H00000Roi",
level : 2,
note : "none",
parentId : "0064H00000ysL",
title : "pending"
},
{
"children" :
[
{
id : "6A45E2EC-7825",
level : 3,
note : "|",
parentId : "a0H4H00000Roi",
title : ""
}
],
id : "a0H4H00000Roi",
level : 2,
note : "",
parentId : "0064H00000ysL",
title : "Change me"
}
],
id : "0064H00000ysL",
level : 1,
note : "hello",
title : "Test Co"
}
在此之后,我通過地圖函式生成更新串列 - 示例結果:
[{
content: "New Co",
id: "0064H00000ysL",
note: "Here's your update"
}, {
content: "91%",
id: "a0H4H00000Roi",
note: "New note here"
}]
我需要遍歷更新物件陣列并更新嵌套物件值,我嘗試了一些東西,但似乎無法完全掌握它(我的 JS 技能有點受限制)。
這是我最后一次嘗試,取自我在這里找到的最接近的解決方案: Javascript update values in Nested object by array path
var updates = $('div.node').map(function() {
return {
id: $(this).attr("id"),
content: $(this).find('div.content').text(),
note: $(this).find('div.note').text()
};
}).get();
const checkAndChange = (obj, update) => { //function to check id match for update
if (update.id.includes(obj.id)) {
obj.title = update.content;
obj.note = update.note;
}
}
const recursion = (obj, update) => {
const o = obj;
checkAndChange(o, update); // check if id exists update values
if (o.children.length > 0) { //check if has children
o.children.forEach(v => { //if has children do same recursion for children
recursion(v, update);
});
}
return o; //return updated object
}
var updatesLength = updates.length;
for(let it = 0; it < updatesLength; it ) {
recursion(obj, updates[it]);
}
console.log(obj)
頂部的縮進映射函式作業正常,但當我嘗試回圈更新陣列并寫回主物件 (obj) 時,出現Uncaught TypeError: Cannot read properties of undefined (reading 'id')"。
任何幫助表示贊賞
uj5u.com熱心網友回復:
您可以在這里使用遞回方法,我們將創建一個函式updateNestedObj()來應用更新,應用于每個物件及其任何子物件:
const objToUpdate = { children : [ { children : [ { children : [ { id : "F100517B-D00F", level : 4, note : "update me", parentId : "23A2A0DB-CCE3", title : "change me" } ], id : "23A2A0DB-CCE3", level : 3, note : "me too", parentId : "a0H4H00000Roi", title : "..and me" } ], id : "a0H4H00000Roi", level : 2, note : "none", parentId : "0064H00000ysL", title : "pending" }, { "children" : [ { id : "6A45E2EC-7825", level : 3, note : "|", parentId : "a0H4H00000Roi", title : "" } ], id : "a0H4H00000Roi", level : 2, note : "", parentId : "0064H00000ysL", title : "Change me" } ], id : "0064H00000ysL", level : 1, note : "hello", title : "Test Co" }
const updateArr = [{ content: "New Co", id: "0064H00000ysL", note: "Here's your update" }, { content: "91%", id: "a0H4H00000Roi", note: "New note here" }];
function updateNestedObj(obj, updates) {
const updateToApply = updates.find(upd => upd.id === obj.id);
if (updateToApply) {
obj.title = updateToApply.content;
obj.note = updateToApply.note;
}
// Apply updates to any child objects
for(let k in obj) {
if (typeof(obj[k]) === 'object') {
updateNestedObj(obj[k], updates);
}
}
}
updateNestedObj(objToUpdate, updateArr);
console.log(objToUpdate)
.as-console-wrapper { max-height: 100% !important; top: 0; }
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標籤:javascript 数组 循环 目的
