我正在尝试从平面数组构建树形数组,平面数组中的每个项目都有两个属性需要用于构建树形数组,它们是 1. 类别。 2. subCategrie,字符串数组。
let data = [
{
id: 1,
name: "Zend",
category: "php",
subCategory: ["framework"]
},
{
id: 2,
name: "Laravel",
category: "php",
subCategory: ["framework"]
},
{
id: 3,
name: "Vesion 5",
category: "php",
subCategory: ["versions"]
},
{
id: 4,
name: "Angular",
category: "frontend",
subCategory: ["framework", "typescript"]
},
{
id: 5,
name: "Aurelia",
category: "frontend",
subCategory: ["framework", "typescript"]
},
{
id: 6,
name: "JQuery",
category: "frontend",
subCategory: []
}
];
应该是
let tree = [
{
name: "php",
children: [
{
name: "framework",
children: [
{
id: 1,
name: "Zend"
},
{
id: 2,
name: "Laravel"
}
]
},
{
name: "versions",
children: [
{
id: 3,
name: "Vesion 5"
}
]
}
]
}
// ...
];
有没有解决类似问题的文章,链接? 我尝试了很多次,但在尝试构建子类别子类别时卡住了。
这是我最后一次抛出错误的尝试,我知道这是错误的,但它是为那些想看到我的尝试的人准备的
const list = require('./filter.json')
let tree = {};
for (let filter of list) {
if (tree[filter.category]) {
tree[filter.category].push(filter);
} else {
tree[filter.category] = [filter];
}
}
function buildChildren(list, subcategories, category, index) {
let tree = {}
for (let filter of list) {
if (filter.subcategory.length) {
for (let i = 0; i < filter.subcategory.length; i++) {
let branch = list.filter(item => item.subcategory[i] === filter.subcategory[i]);
branch.forEach(item =>{
if (tree[filter.subcategory[i]]){
tree[filter.subcategory[i]] = tree[filter.subcategory[i]].push(item)
}else{
tree[item.subcategory[i]] = [item]
}
})
}
}
}
console.log('tree ', tree);
}
最佳答案
注意,对于 javascript,我通常使用 Lodash (通常在代码中写成 _
)但是大多数这些方法也应该内置到 javascript 中的对象中(即 _.forEach = Array.forEach())
const tree = [];
// First Group all elements of the same category (PHP, Frontend, etc.)
data = _.groupBy(data, 'category');
_.forEach(data, function (categoryElements, categoryName) {
// Each Category will have it's own subCategories that we will want to handle
let categorySubCategories = {};
// The categoryElements will be an array of all the objects in a given category (php / frontend / etc..)
categoryElements.map(function (element) {
// For each of these categoryies, we will want to grab the subcategories they belong to
element.subCategory.map(function (subCategoryName) {
// Check if teh category (PHP) already has already started a group of this subcategory,
// else initialize it as an empty list
if (!categorySubCategories[subCategoryName]) { categorySubCategories[subCategoryName] = []; }
// Push this element into the subcategory list
categorySubCategories[subCategoryName].push({id: element.id, name: element.name});
});
});
// Create a category map, which will be a list in the format {name, children}, created from
// our categorySubCategories object, which is in the format {name: children}
let categoryMap = [];
_.forEach(categorySubCategories, function (subCategoryElements, subCategoryName) {
categoryMap.push({name: subCategoryName, children: subCategoryElements});
});
// Now that we've grouped the sub categories, just give the tree it's category name and children
tree.push({name: categoryName, children: categoryMap});
});
};
关于javascript - 如何从具有类别和子类别属性的平面对象数组构建树数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52951768/