JavaScript中的按嵌套数组属性分组
我的web应用程序中有一个json对象,如下所示。它是一个产品对象数组,每个产品对象都有一个category属性,其中包含产品所属的类别数组JavaScript中的按嵌套数组属性分组,javascript,underscore.js,Javascript,Underscore.js,我的web应用程序中有一个json对象,如下所示。它是一个产品对象数组,每个产品对象都有一个category属性,其中包含产品所属的类别数组 var products = [ { "id":1, "name":"Product 1", "price":10, "category":[ { "id":10, "name":"Category 1"
var products = [
{
"id":1,
"name":"Product 1",
"price":10,
"category":[
{
"id":10,
"name":"Category 1"
},
{
"id":20,
"name":"Category 2"
}
]
},
{
"id":2,
"name":"Product 2",
"price":20,
"category":[
{
"id":20,
"name":"Category 2"
},
{
"id":30,
"name":"Category 3"
}
]
}
]
现在我想按类别显示它们,最终结果如下所示。我已经在我的项目中使用了underline.js,所以如果我能用它来实现这一点,那就太好了
var categories = [
{
"id":10,
"name":"Category 1",
"products":[
{
"id":1,
"name":"Product 1",
"price":10
}
]
},
{
"id":20,
"name":"Category 2",
"products":[
{
"id":1,
"name":"Product 1",
"price":10
},
{
"id":2,
"name":"Product 2",
"price":20,
}
]
},
{
"id":30,
"name":"Category 3",
"products":[
{
"id":2,
"name":"Product 2",
"price":20,
}
]
}
]
我不完全确定是否有现成的下划线解决方案,但是手动解决也不太难:
var categoriesIndexed = {};
var categories = [];
products.forEach(function(product) {
product.category.forEach(function(category) {
// create a new category if it does not exist yet
if(!categoriesIndexed[category.id]) {
categoriesIndexed[category.id] = {
id: category.id,
name: category.name,
products: []
};
categories.push(categoriesIndexed[category.id]);
}
// add the product to the category
categoriesIndexed[category.id].products.push({
id: product.id,
name: product.name,
price: product.price
});
});
});
我不完全确定是否有现成的下划线解决方案,但是手动解决也不太难:
var categoriesIndexed = {};
var categories = [];
products.forEach(function(product) {
product.category.forEach(function(category) {
// create a new category if it does not exist yet
if(!categoriesIndexed[category.id]) {
categoriesIndexed[category.id] = {
id: category.id,
name: category.name,
products: []
};
categories.push(categoriesIndexed[category.id]);
}
// add the product to the category
categoriesIndexed[category.id].products.push({
id: product.id,
name: product.name,
price: product.price
});
});
});
这就是我要做的
var categories = [];
var cat = new Map();
var addUniqueCategory(category) { /* determine if category is already in list of categories, if not add it to categories */ };
products.each (function (item) {
item.categories.each(function (c) {
if (!cat.has(c.name)) cat.set(c.name, []);
var list = cat.get(c.name);
list.push( { id: item.id, name: item.name, price: item.price });
addUniqueCategory(c);
});
});
categories.each( function (c) {
var list = cat.get(c.name);
if (!c.products) c.products = [];
c.products.splice( c.length, 0, list);
});
大致上,我在打电话以下是我要做的
var categories = [];
var cat = new Map();
var addUniqueCategory(category) { /* determine if category is already in list of categories, if not add it to categories */ };
products.each (function (item) {
item.categories.each(function (c) {
if (!cat.has(c.name)) cat.set(c.name, []);
var list = cat.get(c.name);
list.push( { id: item.id, name: item.name, price: item.price });
addUniqueCategory(c);
});
});
categories.each( function (c) {
var list = cat.get(c.name);
if (!c.products) c.products = [];
c.products.splice( c.length, 0, list);
});
大致上,我在打电话