【发布时间】：2020-09-13 07:43:13
【问题描述】：
嘿，我正在学习如何使用 JS 和 firebase。我的问题是我的订单是随机加载的，我总是希望它按时间排序。我已经尝试对来自 firebase 的数据进行排序，但它仍然是随机出现的。
我看过一些关于对我的地图进行排序的事情，称为“行”，但似乎无法以任何合理的方式实现它。
这就是我尝试在我的订单页面获取之前对我的 firebase 数据库进行排序的方式
// route for database
router.get("/orderslist", (req, res) => {
let orders = []
let number_of_orders
// Getting the snapshot of the order collection
db.collection('orders').orderBy('time').get().then( productSnapshot => {
number_of_orders = productSnapshot.size
// iterating over the order snapshot
productSnapshot.forEach(orderDoc => {
// creating an order object and assigning the ID and the rest of the information from the database
var order = {
id: orderDoc.id,
customer_name: orderDoc.data().customer_name,
date: orderDoc.data().date,
comments: orderDoc.data().comments,
time: orderDoc.data().time,
total: orderDoc.data().total,
order_status: orderDoc.data().order_status,
products: []
}
// using the id, to get the products from the subcollection
db.collection('orders/' + order.id + '/products').get().then( productSnapshot => {
// iterating over the product snapshot
productSnapshot.forEach(productDoc => {
// creating a product object
var product = {
name: productDoc.data().name,
price: productDoc.data().price
}
// then we push the product object to the list of products in the order object
order.products.push(product)
});
// we are finished iterating over the productsnapshot and now we can push it to the orders list
orders.push(order)
// checks if the list is filled with everything from the database
if(orders.length == number_of_orders){
return res.json(orders)
}
});
});
});
});
这是我的 json 输入
[
{
"id": "s2hym8IVa10pEgtgmmq9",
"customer_name": "Mikkel",
"date": "13/05-2020",
"comments": "",
"time": 1050,
"total": 40,
"order_status": true,
"products": [
{
"name": "Latte",
"price": 40
}
]
},
{
"id": "xWmlB9fHD4rw8Di75llp",
"customer_name": "Emil",
"date": "07/05-2020",
"comments": "without sugar",
"time": 1211,
"total": 40,
"order_status": false,
"products": [
{
"name": "Latte",
"price": 40
}
]
},
{
"id": "ggYSVKA1i0U8khIpeud4",
"customer_name": "Oliver",
"date": "01/05-2020",
"comments": "order to be packed neatly because im on a bike",
"time": 1450,
"total": 38,
"order_status": false,
"products": [
{
"name": "Latte Macchiato",
"price": 38
}
]
},
{
"id": "pq62yo42KS41VgeGGiZX",
"customer_name": "Naida",
"date": "07/05-2020",
"comments": "nope",
"time": 1257,
"total": 40,
"order_status": true,
"products": [
{
"name": "Latte",
"price": 40
}
]
},
{
"id": "p2dKspiU535P29Gex6Uz",
"customer_name": "Alper",
"date": "13/05-2020",
"comments": "",
"time": 1937,
"total": 40,
"order_status": false,
"products": [
{
"name": "Latte",
"price": 40
}
]
}
]
这是我的订单页面 JS
// jquery getting our json order data from API
$.get("http://localhost:8888/orderslist", (data) => {
// loops through our orderlist api
let rows = data.map(item => {
let $clone = $('#frontpage_new_ordertable tfoot tr').clone();
$clone.data("id", item.id);
$clone.find('.customer_name').text(item.customer_name);
$clone.find('.date').text(item.date);
$clone.find('.time').text(item.time);
$clone.find('.pickup').text(item.pickup);
$clone.find('.comments').text(item.comments);
$clone.find('.total').text(item.total + ' Kr.');
// accept and cancel buttons
$clone.find('.order_status').html(
`<button class="acceptOrder" type="button">Accept</button>` +
`<button class="cancelOrder" type="button">Cancel</button>`
);
// loops through orders product name
let productsName = item.products.map(prod => `${prod.name}`);
$clone.find('.products').html(productsName.join('<br />'));
// loops through orders product price
let productsPrice = item.products.map(prod => `${prod.price} Kr.`);
$clone.find('.price').html(productsPrice.join('<br />'));
return $clone;
});
//appends to our frontpage html
$("#frontpage_new_ordertable tbody").append(rows);
});
});
【问题讨论】：
-
您只显示一个对象。为了对某些东西进行排序，我期望有一个对象数组。能否请您包含从 firebase 获得的数据？
-
“我已经尝试从 firebase 的数据中进行排序，但仍然没有成功。” 请告诉我们。问题中的代码中没有任何内容正在排序或似乎试图对任何内容进行排序。
-
@T.J.Crowder 添加了 firebase js 和我的其余 json 数据
-
如果我没记错的话，Firebase 本身就提供了排序，甚至在它到达对象数组之前。事实上，您在检索
orders时已经收到了.orderBy('time')调用。如果您想对产品进行分类，只需在get()调用之前添加.orderBy('property')。或者不管它如何工作；我不是 Firebase 专家。但我希望在 Firebase 中对其进行本地排序会更快，或者至少与事后排序一样快。
标签： javascript jquery json firebase sorting