DOJO:LazyTreeGrid中的Lazy加载节点-查找示例代码

这里有一个基于我目前正在做的一些事情的冗长解释/示例。这假设Dojo1.7风格的包具有基本的舒适性（例如，我们假设默认的Dojo包设置正确）。

客户端（js文件）

require(["dojo/ready",
    "dojox/grid/LazyTreeGridStoreModel",
    "dojox/data/QueryReadStore",
    "dojox/grid/LazyTreeGrid"], function(ready, LazyTreeGridStoreModel, QueryReadStore, LazyTreeGrid) {
        ready(function() {
            var cellLayout = [
                {name: 'Name of fruit', field: 'name', width: '300px', defaultValue: ""},
                {name: 'Color of fruit', field: 'color', width: '100px', defaultValue: ""},
                {name: 'Size of fruit', field: 'size', width: '100px', defaultValue: ""}
            ];
            // This is the url on which your server will listen for GET requests
            var dataStore = new QueryReadStore({url: "url/to/load/rows"});
            var treeModel = new LazyTreeGridStoreModel({store: dataStore, childrenAttrs: ['children'], serverStore: true});
            var grid = new LazyTreeGrid({
                treeModel: treeModel,
                structure: cellLayout,
                autoHeight: 20}, "gridContainerId"); // you need to have a DOM element by that id
            grid.startup();
        }
    });

服务器端：

您需要一个服务器端处理程序来侦听url/to/load/rows上的GET请求。这些请求最多有3个参数：

start    - 0-based index of the first item to return
count    - number of items to return
parentId - Id of the parent of the children items that are requested.
           Optional, not present for 1st call (because 1st-level objects have no parents).

该处理程序可以用您喜欢的服务器端语言（即C#与ASP.Net MVC、Ruby等）编写

服务器处理程序的工作是返回一个包含以下3个属性的json结构：

items       - Array containing the items you want to display.
              Each item represents a row in the grid. Each item should
              have at least some of the fields you specified in your layout
              and must have the 2 following characteristics:
                - Must have a "children" attribute. That is a bool value.
                  If true, the row is assumed to have children and will have
                  an expando left of it. The grid query the server for children when you expand it.
                  If false, the row is considered terminal, no expando is shown.
                - Must have a unique id. This will be the id that will be set in the "parentId"
                  param when querying the server for the children of that row. It must be stored
                  in the field referred to by the "identifier" attribute (see below).
identifier  - The name of the attribute of each item that contains its unique id.
numRows     - The number of total items existing on this level (not just the number of items you sent back).
              This is used to set the grid & scrollbar size and other UI things.

客户端/服务器通信

在我前面的例子的基础上，一旦网格启动（客户端），它就会请求如下内容：

GET url/to/load/rows?start=0&count=25

服务器将返回以下内容：

{
    "items":[
        {"name": "apple", "color": "red", "size": "small", "uniqueId":"a1", "children": true},
        {"name": "watermelon", "color": "green", "size": "big", "uniqueId":"b1", "children": false}
    ],
    "identifier": "uniqueId",
    "numRows":2
}

网格将显示这两种水果。apple将具有expando，但不具有watermelon（由于children属性）。假设用户单击了apple expando。网格将请求其子级：

GET url/to/load/rows?parentId=a1&start=0&count=25

服务器可能会返回以下内容：

{
    "items":[
        {"name": "mcintosh", "color": "red-green", "size": "small", "uniqueId":"a2", "children": false}
    ],
    "identifier": "uniqueId",
    "numRows":1
}

然后，网格将在apple行下显示一个子项。

我想我有你想要的东西。一些关于将QueryReadStore与dojox.grid.LazyTreeGrid一起使用的优秀示例代码，也一步一步地进行了充分的解释。

请参见此处：http://livedocs.dojotoolkit.org/dojox/grid/LazyTreeGrid

我希望这能促进你的工作，你能够实现你的目标。

问候

弗兰克。