Extjs中ComboBoxTree的實現

最近涉及到的一個項目中，需要實現ComboBoxTree的效果，首先，看看效果吧……

在Extjs中是沒有這種效果的，所以得自己寫，在網絡上看了看別人的資料，自己再總結了一下，修改了一下，代碼如下：

Ext.ux.TreeCombo = Ext.extend(Ext.form.ComboBox, {
    constructor: function (cfg) {
        cfg = cfg || {};
        Ext.ux.TreeCombo.superclass.constructor.call(this, Ext.apply({
            maxHeight: 300,
            editable: false,
            mode: 'local',
            triggerAction: 'all',
            rootVisible: false,
            selectMode: 'all'
        }, cfg));
    },
    store: new Ext.data.SimpleStore({
        fields: [],
        data: [[]]
    }),
    // 重寫onViewClick，使展開樹結點是不關閉下拉框   
    onViewClick: function (doFocus) {
        var index = this.view.getSelectedIndexes()[0], s = this.store, r = s.getAt(index);
        if (r) {
            this.onSelect(r, index);
        }
        if (doFocus !== false) {
            this.el.focus();
        }
    },
    tree: null,
    // 隱藏值   
    hiddenValue: null,
    getHiddenValue: function () {
        return this.hiddenValue;
    },
    getValue: function () {   //增加適用性，與原來combo組件一樣
        return this.hiddenValue;
    },
    setHiddenValue: function (code, dispText) {
        this.setValue(code);
        Ext.form.ComboBox.superclass.setValue.call(this, dispText);
        this.hiddenValue = code;
    },
    initComponent: function () {
        var _this = this;
        var tplRandomId = 'deptcombo_' + Math.floor(Math.random() * 1000) + this.tplId
        this.tpl = "<div style='height:" + _this.maxHeight + "px' id='" + tplRandomId + "'></div>"
        this.tree = new Ext.tree.TreePanel({
            border: false,
            enableDD: false,
            enableDrag: false,
            rootVisible: _this.rootVisible || false,
            autoScroll: true,
            trackMouseOver: true,
            height: _this.maxHeight,
            lines: true,
            singleExpand: true,
            root: new Ext.tree.AsyncTreeNode({
                id: _this.rootId,
                text: _this.rootText,
                iconCls: 'ico-root',
                expanded: true,
                leaf: false,
                border: false,
                draggable: false,
                singleClickExpand: false,
                hide: true
            }),
            loader: new Ext.tree.TreeLoader({
                nodeParameter: 'ID',
                requestMethod: 'GET',
                dataUrl: _this.url
            })
        });
        this.tree.on('click', function (node) {
            if ((_this.selectMode == 'leaf' && node.leaf == true) || _this.selectMode == 'all') {
                if (_this.fireEvent('beforeselect', _this, node)) {
                    _this.fireEvent('select', _this, node);
                }
            }
        });
        this.on('select', function (obj, node) {
            var dispText = node.text;
            var code = node.id;
            obj.setHiddenValue(code, dispText);
            obj.collapse();
        });
        this.on('expand', function () {
            this.tree.render(tplRandomId);
        });
        Ext.ux.TreeCombo.superclass.initComponent.call(this);
    }
})
Ext.reg("treecombo", Ext.ux.TreeCombo);  

之後呢，在主頁中添加Extjs類庫

<link href="../ext/resources/css/ext-all.css" rel="stylesheet" type="text/css" />
<script src="../ext/adapter/ext/ext-base.js" type="text/javascript"></script>
<script src="../ext/ext-all.js" type="text/javascript"></script>
<script src="../ext/src/locale/ext-lang-zh_CN.js" type="text/javascript"></script>
<script src="../ext/ComboBoxTree.js" type="text/javascript"></script>
<script src="login.js" type="text/javascript"></script>

其中，login.js的代碼如下：

/* File Created: 五月 27, 2013 */
Ext.onReady(function () {
    var _window = new Ext.Window({
        title: "查詢條件",
        renderTo: Ext.getBody(),
        frame: true,
        plain: true,
        buttonAlign: "center",
        closeAction: "hide",
        maximizable: true,
        closable: true,
        bodyStyle: "padding:20px",
        width: 350,
        height: 300,
        layout: "form",
        lableWidth: 110,
        defaults: { xtype: "textfield", width: 180 },
        items: [
            {
                fieldLabel: "案件編號",
                anchor: "100%"
            },
			{
			    xtype: "datefield",
			    fieldLabel: "案發時間",
			    anchor: "100%"
			},
            {
                fieldLabel: "舉報人",
                anchor: "100%"
            },
            {
                fieldLabel: "被舉報單位或個人",
                anchor: "100%"
            },
            {
                xtype: "treecombo",
                fieldLabel: "案件發生地",
                anchor: "100%",
                url: "http://localhost:1502/treeData.ashx"/// <reference path="../treeData.ashx" />                
            },
            {
                xtype: "treecombo",
                fieldLabel: "案件類型",
                anchor: "100%",
                url: "http://localhost:1502/window/ajwflx.ashx"
            },
            {
                 xtype: "treecombo",
                fieldLabel: "案件性質",
                anchor: "100%",
                url: "http://localhost:1502/window/ajwfxz.ashx"
            }
        ],
        buttons: [{ text: "確定" }, { text: "取消", handler: function () { _window.hide(); } }]
    })
    _window.show();
}) 

treedata.ashxd的內容爲：

string strTreeNode = "[" +
                                    "{'id':150100,'leaf':false,expanded:false,'text':'呼和浩特市國土資源局','children':[" +
                                        "{'id':150101,'leaf':true,'children':null,'text':'市轄區國土資源局'}," +
                                        "{'id':150102,'leaf':true,'children':null,'text':'新城區國土資源局'}," +
                                        "{'id':150103,'leaf':true,'children':null,'text':'回民區國土資源局'}," +
                                        "{'id':150104,'leaf':true,'children':null,'text':'玉泉區國土資源局'}," +
                                        "{'id':150105,'leaf':true,'children':null,'text':'賽罕區國土資源局'}," +
                                        "{'id':150121,'leaf':true,'children':null,'text':'土默特左旗國土資源局'}," +
                                        "{'id':150122,'leaf':true,'children':null,'text':'托克托縣國土資源局'}," +
                                        "{'id':150123,'leaf':true,'children':null,'text':'和林格爾縣國土資源局'}," +
                                        "{'id':150124,'leaf':true,'children':null,'text':'清水河縣國土資源局'}," +
                                        "{'id':150125,'leaf':true,'children':null,'text':'武川縣國土資源局'}" +
                                    "]}," +
                                    "{'id':150200,'leaf':false,expanded:false,'text':'包頭市國土資源局','children':[" +
                                        "{'id':150201,'leaf':true,'children':null,'text':'市轄區國土資源局'}," +
                                        "{'id':150202,'leaf':true,'children':null,'text':'東河區國土資源局'}," +
                                        "{'id':150203,'leaf':true,'children':null,'text':'昆都侖區國土資源局'}," +
                                        "{'id':150204,'leaf':true,'children':null,'text':'青山區國土資源局'}," +
                                        "{'id':150205,'leaf':true,'children':null,'text':'石柺區國土資源局'}," +
                                        "{'id':150206,'leaf':true,'children':null,'text':'白雲礦區國土資源局'}," +
                                        "{'id':150207,'leaf':true,'children':null,'text':'九原區國土資源局'}," +
                                        "{'id':150221,'leaf':true,'children':null,'text':'土默特右旗國土資源局'}," +
                                        "{'id':150222,'leaf':true,'children':null,'text':'固陽縣國土資源局'}," +
                                        "{'id':150223,'leaf':true,'children':null,'text':'達爾罕茂明安聯合旗國土資源局'}" +
                                    "]}," +
                                    "{'id':150300,'leaf':false,expanded:false,'text':'烏海市國土資源局','children':[" +
                                        "{'id':150301,'leaf':true,'children':null,'text':'市轄區國土資源局'}," +
                                        "{'id':150302,'leaf':true,'children':null,'text':'海勃灣區國土資源局'}," +
                                        "{'id':150303,'leaf':true,'children':null,'text':'海南區國土資源局'}," +
                                        "{'id':150304,'leaf':true,'children':null,'text':'烏達區國土資源局'}" +
                                    "]}," +
                                    "{'id':150400,'leaf':false,expanded:false,'text':'赤峯市國土資源局','children':[" +
                                        "{'id':150401,'leaf':true,'children':null,'text':'市轄區國土資源局'}," +
                                        "{'id':150402,'leaf':true,'children':null,'text':'紅山區國土資源局'}," +
                                        "{'id':150403,'leaf':true,'children':null,'text':'元寶山區國土資源局'}," +
                                        "{'id':150404,'leaf':true,'children':null,'text':'松山區國土資源局'}," +
                                        "{'id':150421,'leaf':true,'children':null,'text':'阿魯科爾沁旗國土資源局'}," +
                                        "{'id':150422,'leaf':true,'children':null,'text':'巴林左旗國土資源局'}," +
                                        "{'id':150423,'leaf':true,'children':null,'text':'巴林右旗國土資源局'}," +
                                        "{'id':150424,'leaf':true,'children':null,'text':'林西縣國土資源局'}," +
                                        "{'id':150425,'leaf':true,'children':null,'text':'克什克騰旗國土資源局'}," +
                                        "{'id':150426,'leaf':true,'children':null,'text':'翁牛特旗國土資源局'}," +
                                        "{'id':150428,'leaf':true,'children':null,'text':'喀喇沁旗國土資源局'}," +
                                        "{'id':150429,'leaf':true,'children':null,'text':'寧城縣國土資源局'}," +
                                        "{'id':150430,'leaf':true,'children':null,'text':'敖漢旗國土資源局'}" +
                                    "]}," +
                                    "{'id':150500,'leaf':false,expanded:false,'text':'通遼市國土資源局','children':[" +
                                        "{'id':150501,'leaf':true,'children':null,'text':'市轄區國土資源局'}," +
                                        "{'id':150502,'leaf':true,'children':null,'text':'科爾沁區國土資源局'}," +
                                        "{'id':150521,'leaf':true,'children':null,'text':'科爾沁左翼中旗國土資源局'}," +
                                        "{'id':150522,'leaf':true,'children':null,'text':'科爾沁左翼後旗國土資源局'}," +
                                        "{'id':150523,'leaf':true,'children':null,'text':'開魯縣國土資源局'}," +
                                        "{'id':150524,'leaf':true,'children':null,'text':'庫倫旗國土資源局'}," +
                                        "{'id':150525,'leaf':true,'children':null,'text':'奈曼旗國土資源局'}," +
                                        "{'id':150526,'leaf':true,'children':null,'text':'扎魯特旗國土資源局'}," +
                                        "{'id':150581,'leaf':true,'children':null,'text':'霍林郭勒市國土資源局'}" +
                                    "]}," +
                                    "{'id':150600,'leaf':false,expanded:false,'text':'鄂爾多斯市國土資源局','children':[" +
                                        "{'id':150602,'leaf':true,'children':null,'text':'東勝區國土資源局'}," +
                                        "{'id':150621,'leaf':true,'children':null,'text':'達拉特旗國土資源局'}," +
                                        "{'id':150622,'leaf':true,'children':null,'text':'準格爾旗國土資源局'}," +
                                        "{'id':150623,'leaf':true,'children':null,'text':'鄂托克前旗國土資源局'}," +
                                        "{'id':150624,'leaf':true,'children':null,'text':'鄂托克旗國土資源局'}," +
                                        "{'id':150625,'leaf':true,'children':null,'text':'杭錦旗國土資源局'}," +
                                        "{'id':150626,'leaf':true,'children':null,'text':'烏審旗國土資源局'}," +
                                        "{'id':150627,'leaf':true,'children':null,'text':'伊金霍洛旗國土資源局'}" +
                                    "]}," +
                                    "{'id':150700,'leaf':false,expanded:false,'text':'呼倫貝爾市國土資源局','children':[" +
                                        "{'id':150701,'leaf':true,'children':null,'text':'市轄區國土資源局'}," +
                                        "{'id':150702,'leaf':true,'children':null,'text':'海拉爾區國土資源局'}," +
                                        "{'id':150721,'leaf':true,'children':null,'text':'阿榮旗國土資源局'}," +
                                        "{'id':150722,'leaf':true,'children':null,'text':'莫力達瓦達斡爾族自治旗國土資源局'}," +
                                        "{'id':150723,'leaf':true,'children':null,'text':'鄂倫春自治旗國土資源局'}," +
                                        "{'id':150724,'leaf':true,'children':null,'text':'鄂溫克族自治旗國土資源局'}," +
                                        "{'id':150725,'leaf':true,'children':null,'text':'陳巴爾虎旗國土資源局'}," +
                                        "{'id':150726,'leaf':true,'children':null,'text':'新巴爾虎左旗國土資源局'}," +
                                        "{'id':150727,'leaf':true,'children':null,'text':'新巴爾虎右旗國土資源局'}," +
                                        "{'id':150781,'leaf':true,'children':null,'text':'滿洲裏市國土資源局'}," +
                                        "{'id':150782,'leaf':true,'children':null,'text':'牙克石市國土資源局'}," +
                                        "{'id':150783,'leaf':true,'children':null,'text':'扎蘭屯市國土資源局'}," +
                                        "{'id':150784,'leaf':true,'children':null,'text':'額爾古納市國土資源局'}," +
                                        "{'id':150785,'leaf':true,'children':null,'text':'根河市國土資源局'}" +
                                    "]}," +
                                    "{'id':150800,'leaf':false,expanded:false,'text':'巴彥淖爾市國土資源局','children':[" +
                                        "{'id':150801,'leaf':true,'children':null,'text':'市轄區國土資源局'}," +
                                        "{'id':150802,'leaf':true,'children':null,'text':'臨河區國土資源局'}," +
                                        "{'id':150821,'leaf':true,'children':null,'text':'五原縣國土資源局'}," +
                                        "{'id':150822,'leaf':true,'children':null,'text':'磴口縣國土資源局'}," +
                                        "{'id':150823,'leaf':true,'children':null,'text':'烏拉特前旗國土資源局'}," +
                                        "{'id':150824,'leaf':true,'children':null,'text':'烏拉特中旗國土資源局'}," +
                                        "{'id':150825,'leaf':true,'children':null,'text':'烏拉特後旗國土資源局'}," +
                                        "{'id':150826,'leaf':true,'children':null,'text':'杭錦後旗國土資源局'}" +
                                    "]}," +
                                    "{'id':150900,'leaf':false,expanded:false,'text':'烏蘭察布市國土資源局','children':[" +
                                        "{'id':150901,'leaf':true,'children':null,'text':'市轄區國土資源局'}," +
                                        "{'id':150902,'leaf':true,'children':null,'text':'集寧區國土資源局'}," +
                                        "{'id':150921,'leaf':true,'children':null,'text':'卓資縣國土資源局'}," +
                                        "{'id':150922,'leaf':true,'children':null,'text':'化德縣國土資源局'}," +
                                        "{'id':150923,'leaf':true,'children':null,'text':'商都縣國土資源局'}," +
                                        "{'id':150924,'leaf':true,'children':null,'text':'興和縣國土資源局'}," +
                                        "{'id':150925,'leaf':true,'children':null,'text':'涼城縣國土資源局'}," +
                                        "{'id':150926,'leaf':true,'children':null,'text':'察哈爾右翼前旗國土資源局'}," +
                                        "{'id':150927,'leaf':true,'children':null,'text':'察哈爾右翼中旗國土資源局'}," +
                                        "{'id':150928,'leaf':true,'children':null,'text':'察哈爾右翼後旗國土資源局'}," +
                                        "{'id':150929,'leaf':true,'children':null,'text':'四子王旗國土資源局'}," +
                                        "{'id':150981,'leaf':true,'children':null,'text':'豐鎮市國土資源局'}" +
                                    "]}," +
                                    "{'id':152200,'leaf':false,expanded:false,'text':'興安盟國土資源局','children':[" +
                                        "{'id':152201,'leaf':true,'children':null,'text':'烏蘭浩特市國土資源局'}," +
                                        "{'id':152202,'leaf':true,'children':null,'text':'阿爾山市國土資源局'}," +
                                        "{'id':152221,'leaf':true,'children':null,'text':'科爾沁右翼前旗國土資源局'}," +
                                        "{'id':152222,'leaf':true,'children':null,'text':'科爾沁右翼中旗國土資源局'}," +
                                        "{'id':152223,'leaf':true,'children':null,'text':'扎賚特旗國土資源局'}," +
                                        "{'id':152224,'leaf':true,'children':null,'text':'突泉縣國土資源局'}" +
                                    "]}," +
                                    "{'id':152500,'leaf':false,expanded:false,'text':'錫林郭勒盟國土資源局','children':[" +
                                        "{'id':152501,'leaf':true,'children':null,'text':'二連浩特市國土資源局'}," +
                                        "{'id':152502,'leaf':true,'children':null,'text':'錫林浩特市國土資源局'}," +
                                        "{'id':152522,'leaf':true,'children':null,'text':'阿巴嘎旗國土資源局'}," +
                                        "{'id':152523,'leaf':true,'children':null,'text':'蘇尼特左旗國土資源局'}," +
                                        "{'id':152524,'leaf':true,'children':null,'text':'蘇尼特右旗國土資源局'}," +
                                        "{'id':152525,'leaf':true,'children':null,'text':'東烏珠穆沁旗國土資源局'}," +
                                        "{'id':152526,'leaf':true,'children':null,'text':'西烏珠穆沁旗國土資源局'}," +
                                        "{'id':152527,'leaf':true,'children':null,'text':'太僕寺旗國土資源局'}," +
                                        "{'id':152528,'leaf':true,'children':null,'text':'鑲黃旗國土資源局'}," +
                                        "{'id':152529,'leaf':true,'children':null,'text':'正鑲白旗國土資源局'}," +
                                        "{'id':152530,'leaf':true,'children':null,'text':'正藍旗國土資源局'}," +
                                        "{'id':152531,'leaf':true,'children':null,'text':'多倫縣國土資源局'}" +
                                    "]}," +
                                    "{'id':152900,'leaf':false,expanded:false,'text':'阿拉善盟國土資源局','children':[" +
                                        "{'id':152921,'leaf':true,'children':null,'text':'阿拉善左旗國土資源局'}," +
                                        "{'id':152922,'leaf':true,'children':null,'text':'阿拉善右旗國土資源局'}," +
                                        "{'id':152923,'leaf':true,'children':null,'text':'額濟納旗國土資源局'}" +
                                    "]}" +
                                "]";

            context.Response.Write(strTreeNode);

如此，上面所述的效果就實現了……