我正在开发基于dojo框架的Web应用程序.
我决定使用dojox.data.JsonRestStore与服务器进行通信.
例如,我在Json中具有订单(电子商务)的这种表示形式：
{
id: int,
name: str,
date: str,
items: [
{
id: int,
name: str,
pcs: int,
price: int,
total: int
}, ...
]
}
订单具有一些基本属性(id,名称,日期),并且还包含订购商品的数组.
我不确定这是否是好的(REST)设计,并且我想知道订购的商品是否应该在单独的资源中(因此也应该在单独的jsonRestStore中).
我想在dojo Form中显示Orders的基本属性,而在dojo Datagrid中显示Ordered的项目时,可能对当前的对象模型有麻烦.
所以我的问题是,我当前的方法是否可行-以创建REST客户端应用程序的方式？另外,在dojo中使用datagrid实现示例表单的正确方法是什么？
解决方法:
虽然您的设计是RESTful的,而REST体系结构中没有任何要求,但我认为大多数人都同意将资源分开是最好的方法.如果您检出Restful Web Services,他们会将其描述为面向资源的体系结构.
我已经制定了一个示例,将订单和项目保留在单独的JsonRestStores中,并允许您通过Dojo表单显示Order对象,并通过Dojo DataGrid显示订单的项目.我认为代码很简单,我还在代码中添加了一些注释,以尝试清除问题.
我创建了一个简单的ASP.NET MVC 3后端,以为该示例提供一些虚拟数据.我也发布了该代码,尽管您实际上只对代码的“查看”部分感兴趣,但后端代码也可以帮助您弄清或更改您拥有的任何后端代码.
视图：
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>JsonRestStore Datagrid Example</title>
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/dojo/1.6.1/dojo/resources/dojo.css"/>
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/dojo/1.6.1/dijit/themes/tundra/tundra.css"/>
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/dojo/1.6.1/dojox/grid/resources/Grid.css"/>
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/dojo/1.6.1/dojox/grid/resources/tundraGrid.css"/>
<script type='text/javascript' src='https://ajax.googleapis.com/ajax/libs/dojo/1.6.1/dojo/dojo.xd.js' djConfig="parSEOnLoad:true"></script>
<script type="text/javascript">
dojo.require("dojox.data.JsonRestStore");
dojo.require("dojox.grid.DataGrid");
dojo.require("dijit.form.DateTextBox");
dojo.require("dojox.grid.cells.dijit");
dojo.require("dojo.date.locale");
var item_structure = null;
dojo.ready(function () {
setItemTableStructure();
//retrieve a single order
//expects json to look like
// {"Id":2,"Name":"Order Name 2","Date":"\/Date(1321135185260)\/","Items":{"Ref":"/Order/2/Items"}}
order_store = new dojox.data.JsonRestStore({ target: "/Order/2", idAttribute: "Id" });
order_store.fetch({
onComplete: function (item) {
//this method is called after an item is fetched into the store
//item here is the order json object
var orderId = new dijit.form.TextBox({ value: order_store.getValue(item, 'Id') }, 'orderId');
var orderName = new dijit.form.TextBox({ value: order_store.getValue(item, 'Name') }, 'orderName');
var orderDate = new dijit.form.DateTextBox({ value: parseJsonDate(order_store.getValue(item, 'Date')) }, 'orderDate');
var items = order_store.getValue(item, 'Items').Ref;
//make a call to retrieve the items that are contained within a particular order
//expects a json object that looks like
//[{"Ref":"/Item/1"},{"Ref":"/Item/2"},{"Ref":"/Item/3"},{"Ref":"/Item/4"},{"Ref":"/Item/5"}]
var xhrArgs = {
url: items,
handleAs: "json",
load: loadOrder, //main method
error: function (error) {
console.log(error);
}
}
var deferred = dojo.xhrGet(xhrArgs);
}
});
});
//This is the main method
function loadOrder(data) {
var itemIds = "";
dojo.forEach(data, function(item, i){
itemIds += item.Ref.charat(item.Ref.length-1);
itemIds += ",";
});
itemIds = itemIds.substring(0, itemIds.length-1);
//build the backend to accept a comma seperated list of item ids
//like /Item/1,2,3
item_store = new dojox.data.JsonRestStore({target:"/Item/" + itemIds, idAttribute:"Id"});
items = new dojox.grid.DataGrid({
name: "items",
formatter: function(date) {
if (date) return dojo.date.locale.format(parseJsonDate(date), {
selector: "Date"
})
},
structure: item_structure,
store: item_store
}, dojo.byId('orderItems'));
items.startup();
}
function setItemTableStructure() {
item_structure = [
{
field: 'Id'
},
{
field: 'Name'
},
{
field: 'Price'
},
{
field: 'Date',
type: dojox.grid.cells.DateTextBox,
widgetProps: {
selector: "Date"
},
formatter: function(v) {
if (v) return dojo.date.locale.format(parseJsonDate(v), {
selector: 'Date'
})
}
}];
}
function parseJsonDate(jsonDate) {
var offset = new Date().getTimezoneOffset() * 60000;
var parts = /\/Date\((-?\d+)([+-]\d{2})?(\d{2})?.*/.exec(jsonDate);
if (parts[2] == undefined)
parts[2] = 0;
if (parts[3] == undefined)
parts[3] = 0;
return new Date(+parts[1] + offset + parts[2]*3600000 + parts[3]*60000);
}
</script>
</head>
<body>
<h1>Json Rest Store with DataGrid Example</h1><br />
<form style='margin: 10px' action='post'>
<h2>Order</h2>
<input id='orderId' />
<input id='orderName' />
<input id='orderDate' />
</form>
<h2>Items</h2>
<div id='orderItems'></div>
</body>
</html>
楷模：
using System;
namespace OrdersRestService.Models
{
public class Item
{
public int Id { get; set; }
public string Name { get; set; }
public double Price { get; set; }
public DateTime Date { get; set; }
}
}
public class Order
{
public int Id { get; set; }
public string Name { get; set; }
public DateTime Date { get; set; }
public Reference Items { get; set; }
}
public class Reference
{
public string Ref { get; set; }
}
控制器：
namespace OrdersRestService.Controllers
{
public class OrderController : Controller
{
public ActionResult Index(string id)
{
Order order = new Order
{
Id = Convert.ToInt32(id),
Name = "Order Name " + id,
Date = DateTime.Now,
Items = new Reference
{
Ref = "/Order/" + id + "/Items"
}
};
return Json(order, JsonRequestBehavior.AllowGet);
}
public ActionResult Items()
{
List<Reference> items = new List<Reference>();
for (int i = 1; i <= 5; i++)
{
Reference r = new Reference();
r.Ref = "/Item/" + i;
items.Add(r);
}
return Json(items, JsonRequestBehavior.AllowGet);
}
}
public class ItemController : Controller
{
public ActionResult Index(string id)
{
List<Item> items = new List<Item>();
foreach (string itemid in id.Split(','))
{
Item item = new Item
{
Id = Convert.ToInt32(itemid),
Name = "Item Name " + itemid,
Date = DateTime.Now,
};
items.Add(item);
}
return Json(items, JsonRequestBehavior.AllowGet);
}
}
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
}
}
Global.aspx.cs
public class MvcApplication : System.Web.HttpApplication
{
public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
filters.Add(new HandleErrorAttribute());
}
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
"DefaultWithAction", // Route name
"{controller}/{id}/{action}", // URL with parameters
new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
);
}
protected void Application_Start()
{
AreaRegistration.RegisterallAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
}
}
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