很遗憾，过去将近一年的时间里一直在学习，工作之中涉及到Java和Flex，业余时间在和朋友搞Android，实际开发中遇到很多问题都需要学习，偶而挤出来那么一点时间自己也在了解一些新的东西，感觉太多的东西想学，只是时间少的可怜。

从今天开始，计划每周不低于一篇文章，把《ExtJS4.1+MVC3+Spring.NET1.3+EF5 整合》写完，下一系列准备写个SSH2.0+EasyUI的框架，我还是依旧那么的喜欢开源技术。

Tree结构应该说是Web开发中必会的对象之一，在关系型数据库中体现为一种“一对多”的父子表，最为典型的就是系统“管理菜单”和角色“权限”，在本篇之中，“菜单”和“权限”实际上是一张数据表，“菜单”仅涉及到显示数据，“权限”涉及到更多的ExtJS API操作，正面分别讲解这两种情况下的使用。

1 ExtJS 代码

理论上说“管理菜单”应该根据当前登录用户（所属角色）的权限，显示相应的菜单结构，这个可以通过继承System.Web.Mvc.AuthorizeAttribute来实现，在需要验证权限的Controller或方法上添加“特性(Attribute)”即可。权限的实现过程准备单独写一篇说明。

本文章的“管理菜单”涉及到以下几个js文件：

app/controller/menu.js
app/store/menu.js
app/view/menu/tree.js

1.1 先看一下控制器类（app/controller/menu.js）代码

Ext.define(‘Manage.controller.Menu‘, {
    extend: ‘Ext.app.Controller‘,
    stores: [‘Menu‘],
    views: [‘menu.Tree‘],
    init: function() {
		this.control({
		    ‘menuTree‘: {
	            itemclick: this.selectItem
	        }
	    });
    },
    selectItem: function (view, record, item, index) {
        Ext.Ajax.request({
            url: ‘/Manage/Category/Query.aspx?id=‘ + record.data.id,
            success: function (response) {
                var menu = Ext.JSON.decode(response.responseText);
                var url = menu.children.MenuUrl;
                if (url.length > 0) {
                    var body = Ext.getCmp(‘bodyID‘);
                    body.removeAll();
                    body.add({
                        xtype: url
                    });
                }
            }
        });
    }
});

1.2 看下store(app/store/menu.js)中的定义

Ext.define(‘Manage.store.Menu‘, {
	extend: ‘Ext.data.TreeStore‘,
	autoLoad: true,
	sorters: [{
	    property: ‘leaf‘,
	    direction: ‘ASC‘
	}],
	root: {
	    nodeType: ‘async‘,
	    expanded: true
	},
    proxy: {
        type: ‘ajax‘,
        api: {
            read: ‘/Manage/Authorize/Menu.aspx‘
		},
		reader: {
            type: ‘json‘,
            root: ‘children‘
        }
    }
});

1.3 view(app/view/menu/tree.js)代码

Ext.define(‘Manage.view.menu.Tree‘, {
    extend: ‘Ext.tree.Panel‘,
    alias: ‘widget.menuTree‘,
    header : false,
    border : 0,
    store: ‘Menu‘,
    rootVisible: false
});

2 C# 代码

ExtJS 中相应的controll、store、view代码都很简单，而C#返回的结果也很简单，“管理菜单”所请求的URL是：/Manage/Authorize/Menu.aspx，打开Areas/Manage/Controllers/AuthorizeController.cs文件：

public class AuthorizeController : Controller
{
    public IRoleService RoleService { get; set; }
    public IAuthorizeService AuthorizeService { get; set; }

    public ActionResult Menu()
    {
        Role role = this.RoleService.Read("12");
        var childs = this.MenuChildrens(ref role, null);
        var root = new
        {
            id = 0,
            text = "根",
            expanded = true,
            leaf = !childs.Any(),
            children = childs
        };

        return Json(root, JsonRequestBehavior.AllowGet);
    }

    [NonAction]
    private IList<object> MenuChildrens(ref Role role, string parent)
    {
        var list = String.IsNullOrEmpty(parent)
                    ? role.Categories.Where(x => String.IsNullOrEmpty(x.ParentCode))
                    : role.Categories.Where(x => x.ParentCode == parent);

        IList<object> childs = new List<object>();
        if (!list.Any())
        {
            return childs;
        }

        foreach (var row in list)
        {
            var children = this.MenuChildrens(ref role, row.Code);
            childs.Add(new
            {
                id = row.Code,
                text = row.Name,
                expanded = true,
                leaf = !children.Any(),
                children = children
            });
        }
        return childs;
    }
}

{"id":0,"text":"根","expanded":true,"leaf":false,"children":[{"id":"11","text":"数据管理","expanded":true,"leaf":false,"children":[{"id":"1111","text":"新闻管理","expanded":true,"leaf":true,"children":[]}]},{"id":"12","text":"系统管理","expanded":true,"leaf":false,"children":[{"id":"1211","text":"文章模版","expanded":true,"leaf":true,"children":[]}]},{"id":"13","text":"系统配置","expanded":true,"leaf":false,"children":[{"id":"1311","text":"角色管理","expanded":true,"leaf":true,"children":[]},{"id":"1312","text":"管理员管理","expanded":true,"leaf":true,"children":[]},{"id":"1313","text":"权限分配","expanded":true,"leaf":true,"children":[]},{"id":"1314","text":"分类管理","expanded":true,"leaf":true,"children":[]},{"id":"1315","text":"文章管理","expanded":true,"leaf":true,"children":[]}]}]}

在线格式化工具：http://tool.oschina.net/codeformat/json

或者使用Sublime Text编辑器，64位：http://download.csdn.net/detail/xz2001/6490993，32位：http://download.csdn.net/detail/xz2001/6490973

{
	"id": 0,
	"text": "根",
	"expanded": true,
	"leaf": false,
	"children": [{
		"id": "11",
		"text": "数据管理",
		"expanded": true,
		"leaf": false,
		"children": [{
			"id": "1111",
			"text": "新闻管理",
			"expanded": true,
			"leaf": true,
			"children": []
		}]
	}, {
		"id": "12",
		"text": "系统管理",
		"expanded": true,
		"leaf": false,
		"children": [{
			"id": "1211",
			"text": "文章模版",
			"expanded": true,
			"leaf": true,
			"children": []
		}]
	}, {
		"id": "13",
		"text": "系统配置",
		"expanded": true,
		"leaf": false,
		"children": [{
			"id": "1311",
			"text": "角色管理",
			"expanded": true,
			"leaf": true,
			"children": []
		}, {
			"id": "1312",
			"text": "管理员管理",
			"expanded": true,
			"leaf": true,
			"children": []
		}, {
			"id": "1313",
			"text": "权限分配",
			"expanded": true,
			"leaf": true,
			"children": []
		}, {
			"id": "1314",
			"text": "分类管理",
			"expanded": true,
			"leaf": true,
			"children": []
		}, {
			"id": "1315",
			"text": "文章管理",
			"expanded": true,
			"leaf": true,
			"children": []
		}]
	}]
}

下一篇说下TreePanel一些复杂的操作，如节点遍历和复选框的读、写操作等。

ExtJS4.1+MVC3+Spring.NET1.3+EF5 整合十：TreePanel 之 管理菜单,古老的榕树,5-wow.com