摘要：根據(jù)模塊創(chuàng)建模塊失敗。在中，我們配置了標明了這是一個控制器模塊，點擊后會去觸發(fā)控制器加載動作。正常情況下同一個模塊的只加載一次。

前面幾篇文檔，我們基本實現(xiàn)了一個靜態(tài)的extjs頁面，本篇開始，實現(xiàn)左側(cè)導航樹與右側(cè)內(nèi)容的聯(lián)動，也就是點擊導航菜單，加載對應模塊頁面和業(yè)務邏輯，實現(xiàn)js文件的按需加載。

左側(cè)的treelist，當點擊某個節(jié)點的時候，系統(tǒng)根據(jù)tree數(shù)據(jù)里配置的模塊信息，加載這個模塊，并且把模塊對應的主頁面顯示在中間區(qū)域的tabpanel里。

監(jiān)聽導航樹的node點擊事件，進行后續(xù)處理：

 "navlist": {
    "itemclick"：function(el, record, opt){
        //可以通過如下方式獲取點擊節(jié)點的數(shù)據(jù)。
        var nodeData = record.node.data;
    
    }
}

完整的代碼如下:

Ext.define("luter.controller.MainController", {
    extend: "Ext.app.Controller",
    views: ["main.ViewPort"],
    stores: ["NavTreeStore"],
    init: function (application) {
        var me = this;
        this.control({
            "viewport": {//監(jiān)聽viewport的初始化事件，可以做點其他事情在這里，如有必要，記得viewport定義里的alias么？
                "beforerender": function () {
                    console.log("viewport begin render at:" + new Date());
                },
                "afterrender": function () {
                    console.log("viewport  render finished at:" + new Date());
                },
            },
            "syscontentpanel": {
                "afterrender": function (view) {
                    console.log("syscontentpanel rendered at:" + new Date());
                }
            },
            "navlist": {
                "itemclick": function (el, record, opt) {
                    var nodeData = record.node.data;//當前點擊節(jié)點的數(shù)據(jù)

                    var tabpanel = Ext.getCmp("systabpanel");//中間tabpanel
                    var tabcount = tabpanel.items.getCount();//當前tabpanel已經(jīng)打開幾個tab了。
                    var maxTabCount = 5;//最大打開的tab個數(shù)
                    if (tabcount && tabcount > 5) {
                        showFailMesg({
                            title: "為了更好的使用，最多允許打開5個頁面",
                            msg: "您打開的頁面過多，請關(guān)掉一些!"
                        });
                        return false;
                    }
                    if (nodeData.leaf) {//是打開新模塊，否則是展開樹節(jié)點
                        var moduleID = nodeData.module_id;//找到控制器ID,定義在tree的數(shù)據(jù)里modole_id
                        if (!moduleID || moduleID == "") {
                            showFailMesg({
                                title: "創(chuàng)建模塊失敗.",
                                msg: "模塊加載錯誤，模塊id為空，創(chuàng)建模塊失敗"
                            });
                            return false;
                        }
                        console.log("to add module with id:" + moduleID);
                        //開始加載控制器
                        try {
                           //嘗試加載這個控制器，這個過程就是按需ajax加載js文件的過程。
                          //如果這個模塊被加載過，則不會重復加載。
                            var module = luterapp.getController(moduleID);
                        } catch (error) {
                            showFailMesg({
                                msg: "根據(jù)模塊ID:" + moduleID + "創(chuàng)建模塊失敗。" +
                                "
 可能的原因 :
1、該模塊當前沒有實現(xiàn)." +
                                "
 2、模塊文件名稱與模塊名稱不一致，請檢查" +
                                "
Error: " + error + ""
                            });
                            return false;
                        } finally {

                        }
                        //判斷模塊是否加載下來，因為是ajax加載，所以還是判斷一下比較好
                        if (!module) {
                            showFailMesg({
                                msg: "B:load module fail,the module object is null." +
                                "
 maybe :the module is Not available now."
                            });
                            return false;

                        }
                        //加載到之后，默認去獲取控制器里views:[]數(shù)組里的第一個作為主視圖
                        var viewName = module.views[0];
                        console.log("will create a tab with view ,id:" + viewName);
                        var view = module.getView(viewName);
                        console.log("get the view el:" + view);
                        if (!view) {
                            showFailMesg({
                                msg: "Sorry ,to get the module view fail..."
                            });
                            return false;
                        }

                        //判斷一下這個視圖是不是已經(jīng)加載到tabpanel里去了
                        var tabid = me.getTabId(moduleID);
                        console.log("will create a tab with id:" + tabid);
                        var notab = tabpanel.getComponent(tabid);
                        var viewEL = view.create();
                        if (!viewEL) {
                            showFailMesg({
                                msg: "Sorry ,to get the module viewEL fail..."
                            });
                            return false;
                        }

                        if (!notab && null == notab) {//不存在新建
                            //不管是啥，都放到一個panel里面。
                            notab = tabpanel.add(Ext.create("Ext.panel.Panel", {
                                tooltip: nodeData.text + ":" + nodeData.qtip,
                                id: tabid, // tab的唯一id
                                title: nodeData.text, // tab的標題
                                layout: "fit", // 填充布局,它不會讓load進來的東西改變大小
                                border: false, // 無邊框
                                closable: true, // 有關(guān)閉選項卡按鈕
                                iconCls: nodeData.iconCls,
                                listeners: {
                                    // 偵聽tab頁被激活里觸發(fā)的動作
                                    scope: this,
                                    destroy: function () {
                                        console.log("tab :" + tabid + ",has been destroyed")
                                    }
                                },
                                items: [view.create()]
                            }));
                            //新建之后focus
                            tabpanel.setActiveTab(notab);
                        }
                        else {//如果這個tab已經(jīng)存在了，則focus到這個tab
                            tabpanel.setActiveTab(notab);
                        }
                    } else {
                    //如果leaf  =false,則說明這不是一個最底層節(jié)點，是目錄，展開。
                        console.log("tree node expand")
                    }
                }
            }
        });
    },
    //這個方法從tab id里分離出控制器名稱
    getTabId: function (mid) {
        var winid = mid;
        var c = winid.split(".");
        winid = c.pop();
        return winid + "-tab";
    }

});

一般情況下，這個菜單數(shù)據(jù)是保存在后端的，通過權(quán)限判斷加載用戶可訪問的資源形成樹結(jié)構(gòu)返回給前端使用。leaf標明了這是一個目錄還是一個模塊，module_id對應的是控制器的路徑。 比如下面這個測試數(shù)據(jù)中。 "leaf": true, "module_id": "sys.UserController", 在app.js中，我們配置了appFolder:‘a(chǎn)pp/luter’, leaf標明了這是一個控制器模塊，點擊后會去觸發(fā)控制器加載動作。 所以這個模塊的實際路徑(也就是js文件)就是:${appFolder}/controller/${module_id}.js 即：app/luter/controller/sys.UserController.js

 [
  {
    "id": "111",
    "text": "系統(tǒng)管理",
    "href": null,
    "leaf": false,
    "iconCls": "fa fa-home",
    "module_id": "no sign",
    "qtip": "這個地方顯示鼠標懸停提示",
    "children": [
      {
        "id": "11111",
        "text": "用戶管理",
        "href": null,
        "leaf": true,
        "iconCls": "fa fa-user",
        "module_id": "sys.UserController",
        "qtip": "系統(tǒng)用戶管理",
        "children": []
      }
    ]
  }

]

導航菜單與tabpanel 聯(lián)動完成，下面弄個控制器實驗一下效果，以新建一個系統(tǒng)管理分類下的用戶管理模塊功能為例：
系統(tǒng)管理部分模塊放在sys目錄下，so:

控制器:app/luter/controller/sys/UserController.js

模型：app/luter/model/UserModel.js

Store:app/luter/store/UserStore.js

視圖主入口：app/luter/model/view/sys/user/User.js

列表視圖:app/luter/model/view/sys/user/UserList.js

......

Ext.define("luter.controller.sys.UserController", {
    extend: "Ext.app.Controller",
    stores: ["UserStore"], //用戶store
    views: ["sys.user.User"], //主view ，tab里會加載第一個視圖。
    init: function () {
        this.control({
            "userlistview": {
                "beforerender": function (view) {
                    console.log("beforerender   list......   ");
                },
                "afterrender": function (view) {
                    console.log("afterrender   list......   ");
                     // this.getUserStoreStore().load();//如果UserStore里沒設(shè)置autoLoad: true,就可以在這里加載用戶數(shù)據(jù)
                }
            }
        });

    }
});

Ext.define("luter.model.UserModel", {
    extend: "Ext.data.Model",
    fields: [
        {name: "id", type: "string"},
        {name: "username", type: "string"},
        {name: "gender", type: "string"},
        {name: "real_name", type: "string"}
    ]
});

Ext.define("luter.store.UserStore", {
    extend: "Ext.data.Store",
    autoLoad: true,//自動加載數(shù)據(jù)
    model: "luter.model.UserModel",//使用的模型
    pageSize: 15,//每頁數(shù)據(jù)多少
    proxy: {
        type: "ajax",//ajax獲取數(shù)據(jù)
        actionMethods: {
            create: "POST",
            read: "POST",
            update: "POST",
            destroy: "POST"
        },
        api: {
            read: "app/testdata/user.json"http://從這個地方獲取數(shù)據(jù)，當然，這里用測試數(shù)據(jù)
        },
        reader: {//返回數(shù)據(jù)解析器
            type: "json",
            root: "root",//用戶列表數(shù)據(jù)在這個字段下
            successProperty: "success",//成功與失敗的標志位是這個字段
            totalProperty: "total"http://記錄總數(shù)在這個字段
        },
        listeners: {
            exception: function (proxy, response, operation, eOpts) {
                DealAjaxResponse(response);//監(jiān)聽ajax異常提示錯誤
            }
        }
    },
    remoteSort: true,//服務器端排序
    sortOnLoad: true,//加載就排序
    sorters: {//拿ID排序
        property: "id",
        direction: "DESC"
    }

});

Ext.define("luter.view.sys.user.User", {
    extend: "Ext.panel.Panel",
    alias: "widget.userview",
    layout: "fit",
    requires: ["luter.view.sys.user.UserList"],//引入用戶列表模塊
    border: false,
    initComponent: function () {
        var me = this;
        me.items = [{
            xtype: "userlistview",
            layout: "fit"

        }]
        me.callParent(arguments);
    }
});

Ext.define("luter.view.sys.user.UserList", {
    extend: "Ext.grid.Panel",
    alias: "widget.userlistview",//其他地方就可以這么用:xtype:‘userlistview’
    requires: [],
    store: "UserStore",//用到的store
    itemId: "userGrid",//自己的itemid
    columnLines: true,//是否顯示表格線
    viewConfig: {
        emptyText: "暫無數(shù)據(jù)"http://store沒數(shù)據(jù)的時候顯示這個
    },
    initComponent: function () {
        var me = this;
        me.columns = [{
            xtype: "rownumberer",
            text: "序號",
            width: 60
        }, {
            header: "操作",
            xtype: "actioncolumn",
            width: 60,
            sortable: false,
            items: [{
                text: "刪除",
                iconCls: "icon-delete",
                tooltip: "刪除這條記錄",
                handler: function (grid, rowIndex, colIndex) {
                    var record = grid.getStore().getAt(rowIndex);
                    if (!record) {
                        toast({
                            msg: "請選中一條要刪除的記錄"
                        })
                    } else {
                        showConfirmMesg({
                            message: "確定刪除這條記錄?",
                            fn: function (btn) {
                                if (btn === "yes") {
                                    Ext.Ajax.request({
                                        url: "sys/user/delete",
                                        method: "POST",
                                        params: {
                                            id: record.get("id")
                                        },
                                        success: function (response, options) {
                                            DealAjaxResponse(response);
                                            Ext.data.StoreManager.lookup("User").load();
                                        },
                                        failure: function (response, options) {
                                            DealAjaxResponse(response);
                                        }
                                    });
                                } else {
                                    return false;
                                }
                            }

                        })

                    }

                }
            }]
        }, {
        
            header: baseConfig.model.user.id,
            dataIndex: "id",
            hidden: false,
            flex: 1
        },

            {
                header: baseConfig.model.user.username,
                dataIndex: "username",
                flex: 1
            },
            {
                header: baseConfig.model.user.real_name,
                dataIndex: "real_name",
                flex: 1
            }
        ]

        me.bbar = Ext.create("Ext.PagingToolbar", {
            store: me.store,
            displayInfo: true,
            displayMsg: "當前數(shù)據(jù) {0} - {1} 總數(shù)： {2}",
            emptyMsg: "沒數(shù)據(jù)顯示",
            plugins: [new Ext.create("luter.ux.grid.PagingToolbarResizer", {
                options: [5, 10, 15, 20, 25, 50, 100]
            })]
        })
        me.dockedItems = [{
            xtype: "toolbar",
            items: [{
                text: "添加",
                iconCls: baseConfig.appicon.add,
                tooltip: "添加",
                handler: function () {
                    var win = Ext.create("luter.view.sys.user.UserAdd");
                    win.loadView();
                    win.show();

                }
            }]
        }]
        me.listeners = {
            "itemdblclick": function (table, record, html, row, event, opt) {
                if (record) {
                    var id = record.get("id");
                    var view = Ext.create("luter.view.sys.user.UserEdit", {title: "編輯數(shù)據(jù)"});
                    view.loadView();
                    loadFormDataFromDb(view, "sys/user/view?id=" + id);
                } else {
                    showFailMesg({
                        msg: "加載信息失敗，請確認。"
                    })
                }

            }
        }
        me.plugins = []
        me.callParent(arguments);
    }
});

//這里的baseConfig定義在公共配置文件config.js中，如下：

別忘記在app.html中app.js之前引入這個文件。

/**
 * icon_prefix font字體前綴定義
 * baseConfig 全局配置
 */
var icon_prefix = " fa blue-color ", baseConfig = {
    /**
     * 全局常量定義
     */
    cons: {
        noimage: "app/resource/images/noimage.jpg",
        /**
         * 靜態(tài)服務器的地址
         */
        static_server: ""
    },
    /**
     * 渲染器，對Boolean類型的表格列的顯示內(nèi)容進行渲染
     */
    renders: {
        trueText: "",
        falseText: "",
        cancel: ""
    },
    /**
     * 圖標定義
     */
    appicon: {
        home: icon_prefix + "fa-home",
        add: icon_prefix + "fa-plus",
        update: icon_prefix + "fa-edit",
        trash: icon_prefix + "fa-trash",
        delete: icon_prefix + "fa-remove red-color",
        set_wallpaper: icon_prefix + "fa-image",
        setting: icon_prefix + "fa-gears",
        desktop: icon_prefix + "fa-desktop",
        pailie: icon_prefix + "fa-cubes",
        logout: icon_prefix + "fa-power-off",
        avatar: icon_prefix + "fa-photo",
        key: icon_prefix + "fa-key",
        user: icon_prefix + "fa-user",
        refresh: icon_prefix + "fa-refresh blue-color",
        close: icon_prefix + "fa-close",
        male: icon_prefix + "fa-male",
        female: icon_prefix + "fa-female",
        role: icon_prefix + "fa-users",
        user_add: icon_prefix + "fa-user-plus",
        undo: icon_prefix + "fa-undo",
        search: icon_prefix + "fa-search",
        reset: icon_prefix + "fa-retweet",
        yes: icon_prefix + "fa-check green-color",
        no: icon_prefix + "fa-close red-color",
        list_ol: icon_prefix + " fa-list-ol",
        list_alt: icon_prefix + " fa-list-alt",
        ban: icon_prefix + "fa-ban",
        log: icon_prefix + "fa-tty",
        printer: icon_prefix + "fa-print",
        fax: icon_prefix + "fa-fax",
        download: icon_prefix + "fa-cloud-download",
        upload: icon_prefix + "fa-cloud-upload",
        comment: icon_prefix + " fa-commenting-o",
        credit: icon_prefix + "fa fa-gift"
    },
    /**
     * 模型定義
     */
    model: {
        /**
         * 系統(tǒng)用戶模型
         */
        user: {
            id: "ID",
            username: "用戶名",
            real_name: "真實姓名"
        }
    }
};

最后，附上用戶列表的測試數(shù)據(jù)（當然，瞎編的......）：app/testdata/user.json

{
  "total": 33,
  "root": [
    {
      "id": "aaa",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "ccc",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "ffffd",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "eee",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    },
    {
      "id": "fff",
      "username": "user",
      "real_name": "用戶"
    }
  ],
  "success": true
}

如上，沒問題的話，刷新頁面，應該能看到如下所示：

上圖中，一些Extjs默認的樣式經(jīng)過了hack。不是默認樣式。
最終，整個項目的目錄結(jié)構(gòu)如下：

1、打開chrome的開發(fā)控制臺，切換到network面板的js下。
2、刷新頁面
3、重復點擊左側(cè)用戶管理，查看JS加載情況。正常情況下同一個模塊的js只加載一次。