extjs+s2sh实现异步Tree的节点搜索和查找下一个(FindNext)

本文讨论了treefilter实现tree的查询，和后台返回路径的方式，来实现对extjs tree的搜索。

 

介绍部分内容来源网络，先谢谢该作者。

 

          在任何一个Tree树中，提供查找功能无疑会大大方便用户。不用睁大眼睛一级一级去展开，只要输入关键字，回车就能自动定位到节点，岂不快哉？然后再次回车查找下一个。这样的用户体验是相当完美的 ( 见《用户体验这点事儿》)。但在动态异步加载的Tree树中，客户端实现这样的功能就有点困难，因为节点是异步动态加载的。默认是没有全部从服务器端取回的，通常的做法是默认加载第一级，其他级的节点都是惰性按需加载的，用户点了才会展开。而对于这个没有完全加载的树，用户希望搜索节点，怎么实现？笨办法是先展开树的所有节点，然后再在树中搜索。这样的话在服务器数据量大的情况下会非常慢。这里的实现方法是在服务器端的WebService查找，通过AJAX返回第一个匹配节点的路径Path，然后展开这个路径，选中这个搜索到节点。查找下一个（FindNext）的实现方法是…

(提供查找功能的树Tree无疑会大大方便用户)

在任何一个Tree树中，提供查找功能无疑会大大方便用户。不用睁大眼睛一级一级去展开，只要输入关键字，回车就能自动定位到节点，岂不快哉？然后再次回车查找下一个。这样的用户体验是相当完美的。

 

但在动态异步加载的Tree树中，客户端实现这样的功能就有点困难，因为节点是异步动态加载的。默认是没有全部从服务器端取回的，通常的做法是默认加载第一级，其他级的节点都是惰性按需加载的，用户点了才会展开。而对于这个没有完全加载的树，用户希望搜索节点，怎么实现？笨办法是先展开树的所有节点，然后再在树中搜索。这样的话在服务器数据量大的情况下会非常慢。

这里的实现方法是在服务器端的WebService查找，通过AJAX返回第一个匹配节点的路径Path，然后展开这个路径，选中这个搜索到节点。

在ExtJS中，AsyncTreeNode是异步节点，TreeLoader实现对树结点的异步加载，即使服务器取到大量的数据，也没有问题，异步加载能保证性能和节点的按需加载。服务端需要生成指定格式的Json字符串。

 

首先这儿有一个extjs的动态树，默认加载第一级，其他的级按需加载。（由于工程文件太大，s2sh+oracle，后台代码不提供。）下面给出利用treefilter和返回展开路径的web端代码：

dymicTree是一个treePanel，动态树。

var timeOutId = null;
/**
 * 定义一个treefilter，采用第一种方式对动态树进行过滤，当然首先要展开树
 * @author centre
 */
var treeFilter = new Ext.tree.TreeFilter(dymicTree, {
			clearBlank : true,
			autoClear : true
		});
// 保存上次隐藏的空节点
var hiddenPkgs = [];
/**
 * 通过关键字查找树的节点，并定位，这儿有2种实现方式， 1.通过treeFilter，当数据量小的时候是可行的 2.通过返回tree路径，对应数据量大的时候
 * 
 * @param {}
 *            node
 * @param {}
 *            event
 * @author centre
 */

var findByKeyWordFiler = function(node, event) {
	
	// 清除timeOutId
	clearTimeout(timeOutId);

	// 展开树节点
	dymicTree.expandAll();
	// 为了避免重复的访问后台，给服务器造成的压力，采用timeOutId进行控制，如果采用treeFilter也可以造成重复的keyup
	timeOutId = setTimeout(function() {
				// 获取输入框的值。
				var text = node.getValue();
				// 根据输入制作一个正则表达式，'i'代表不区分大小写
				var re = new RegExp(Ext.escapeRe(text), 'i');
				// 先要显示上次隐藏掉的节点
				Ext.each(hiddenPkgs, function(n) {
							n.ui.show();
						});
				hiddenPkgs = [];
				if (text != "") {
					
					treeFilter.filterBy(function(n) {
								// 只过滤叶子节点，这样省去枝干被过滤的时候，底下的叶子都无法显示
								return !n.isLeaf() || re.test(n.text);
							});
					// 如果这个节点不是叶子，而且下面没有子节点，就应该隐藏掉
					dymicTree.root.cascade(function(n) {   	   
						     if(n.id!='0'){
							   if(!n.isLeaf() &&judge(n,re)==false&& !re.test(n.text)){
								hiddenPkgs.push(n);
								n.ui.hide();
								} 
						     }
						   });	
					
				} else {
					treeFilter.clear();
					return;
				}

			}, 500);
}

//过滤不匹配的非叶子节点或者是叶子节点
/**
 * 
 * @param {Object} n
 * @param {Object} re
 * @return {TypeName} 
 * @author yang
 */
var judge =function(n,re){  
			var str=false;
			n.cascade(function(n1){
			if(n1.isLeaf())
			{
			  if(re.test(n1.text)){str=true;return;}
			}
			else{
				
			  if(re.test(n1.text)){str=true;return;}
			}
			});
			
			return str;
	   };
/**
 * 根据路径展开节点后，选中该节点
 * @param {} bSuccess
 * @param {} oLastNode
 */
function onExpandPathComplete(bSuccess, oLastNode) {
	if (!bSuccess)
		return;
	// focus 节点，并选中节点！
	selectNode(oLastNode);
}

/**
 * 选中传入的节点，并单击此节点
 * 
 * @param {}
 *            node 传入节点对象
 * @author centre
 */
var selectNode = function(node) {
	node.ensureVisible();
	node.select();
	node.fireEvent('click', node);
}
/**
 * 通过关键字查找树的节点，并定位，这儿有2种实现方式， 1.通过treeFilter，当数据量小的时候是可行的 2.通过返回tree路径，对应数据量大的时候
 * 支持模糊查询
 * 
 * @param {}
 *            node
 * @param {}
 *            event
 * @author centre
 */
var findByKeyWordPath = function(node, event) {
	// 清除timeOutId
	clearTimeout(timeOutId);
	timeOutId = setTimeout(function() {
				// 获取输入框的值。
				var text = node.getValue().trim();
				// 采用ajax获得需要展开的路径
				if (text != "") {
					Ext.Ajax.request({
								url : 'jsps/servlet/findByKeyword.jsp',
								success : function(response, opts) {
									var obj = Ext.decode(response.responseText);
									var length = obj.record.length;
									dymicTree.root.reload();
									for (var i = 0; i < length; i++) {
										var path = obj.record[i].path;
										dymicTree.expandPath(path,'id',onExpandPathComplete);
									}
								},
								failure : function(response, opts) {
									Ext.Msg.alert("错误提示", "请求失败,请与开发人员联系。")
											.setIcon(Ext.MessageBox.ERROR);
								},
								params : {
									keyWord : text
								}
							});
				} else {
					// Ext.Msg.alert("信息",
					// "请输入关键字").setIcon(Ext.MessageBox.INFO);
					// return;
				}
			}, 500);
}

/**
 * 给输入框绑定keyup事件，需要加上enableKeyEvents:true才能让extjs的textfield代理 鼠标事件
 * 
 * @author centre
 */

searchBox.findById("keyWord").on("keyup", function(node, event) {
			findByKeyWordFiler(node, event);
		});

	

以下是extjs官方帮助文档的代码，可以参考：

Ext.BLANK_IMAGE_URL = 'resources/s.gif';

Docs = {};

ApiPanel = function() {
    ApiPanel.superclass.constructor.call(this, {
        id:'api-tree',
        region:'west',
        split:true,
        header: false,
        width: 280,
        minSize: 175,
        maxSize: 500,
        collapsible: true,
        margins:'0 0 5 5',
        cmargins:'0 0 0 0',
        rootVisible:false,
        lines:false,
        autoScroll:true,
        animCollapse:false,
        animate: false,
        collapseMode:'mini',
        loader: new Ext.tree.TreeLoader({
			preloadChildren: true,
			clearOnLoad: false
		}),
        root: new Ext.tree.AsyncTreeNode({
            text:'Ext JS',
            id:'root',
            expanded:true,
            children:[Docs.classData]
         }),
        collapseFirst:false
    });
    // no longer needed!
    //new Ext.tree.TreeSorter(this, {folderSort:true,leafAttr:'isClass'});

    this.getSelectionModel().on('beforeselect', function(sm, node){
        return node.isLeaf();
    });
};

Ext.extend(ApiPanel, Ext.tree.TreePanel, {
    initComponent: function(){
        this.hiddenPkgs = [];
        Ext.apply(this, {
            tbar:[ ' ',
			new Ext.form.TextField({
				width: 200,
				emptyText:'Find a Class',
                enableKeyEvents: true,
				listeners:{
					render: function(f){
                    	this.filter = new Ext.tree.TreeFilter(this, {
                    		clearBlank: true,
                    		autoClear: true
                    	});
					},
                    keydown: {
                        fn: this.filterTree,
                        buffer: 350,
                        scope: this
                    },
                    scope: this
				}
			}), ' ', ' ',
			{
                iconCls: 'icon-expand-all',
				tooltip: 'Expand All',
                handler: function(){ this.root.expand(true); },
                scope: this
            }, '-', {
                iconCls: 'icon-collapse-all',
                tooltip: 'Collapse All',
                handler: function(){ this.root.collapse(true); },
                scope: this
            }]
        })
        ApiPanel.superclass.initComponent.call(this);
    },
	filterTree: function(t, e){
		var text = t.getValue();
		Ext.each(this.hiddenPkgs, function(n){
			n.ui.show();
		});
		if(!text){
			this.filter.clear();
			return;
		}
		this.expandAll();
		
		var re = new RegExp('^' + Ext.escapeRe(text), 'i');
		this.filter.filterBy(function(n){
			return !n.attributes.isClass || re.test(n.text);
		});
		
		// hide empty packages that weren't filtered
		this.hiddenPkgs = [];
                var me = this;
		this.root.cascade(function(n){
			if(!n.attributes.isClass && n.ui.ctNode.offsetHeight < 3){
				n.ui.hide();
				me.hiddenPkgs.push(n);
			}
		});
	},
    selectClass : function(cls){
        if(cls){
            var parts = cls.split('.');
            var last = parts.length-1;
            var res = [];
            var pkg = [];
            for(var i = 0; i < last; i++){ // things get nasty - static classes can have .
                var p = parts[i];
                var fc = p.charAt(0);
                var staticCls = fc.toUpperCase() == fc;
                if(p == 'Ext' || !staticCls){
                    pkg.push(p);
                    res[i] = 'pkg-'+pkg.join('.');
                }else if(staticCls){
                    --last;
                    res.splice(i, 1);
                }
            }
            res[last] = cls;

            this.selectPath('/root/apidocs/'+res.join('/'));
        }
    }
});


DocPanel = Ext.extend(Ext.Panel, {
    closable: true,
    autoScroll:true,
    
    initComponent : function(){
        var ps = this.cclass.split('.');
        this.title = ps[ps.length-1];
        Ext.apply(this,{
            tbar: ['->',{
                text: 'Config Options',
                handler: this.scrollToMember.createDelegate(this, ['configs']),
                iconCls: 'icon-config'
            },'-',{
                text: 'Properties',
                handler: this.scrollToMember.createDelegate(this, ['props']),
                iconCls: 'icon-prop'
            }, '-',{
                text: 'Methods',
                handler: this.scrollToMember.createDelegate(this, ['methods']),
                iconCls: 'icon-method'
            }, '-',{
                text: 'Events',
                handler: this.scrollToMember.createDelegate(this, ['events']),
                iconCls: 'icon-event'
            }, '-',{
                text: 'Direct Link',
                handler: this.directLink,
                scope: this,
                iconCls: 'icon-fav'
            }, '-',{
                tooltip:'Hide Inherited Members',
                iconCls: 'icon-hide-inherited',
                enableToggle: true,
                scope: this,
                toggleHandler : function(b, pressed){
                     this.body[pressed ? 'addClass' : 'removeClass']('hide-inherited');
                }
            }, '-', {
                tooltip:'Expand All Members',
                iconCls: 'icon-expand-members',
                enableToggle: true,
                scope: this,
                toggleHandler : function(b, pressed){
                    this.body[pressed ? 'addClass' : 'removeClass']('full-details');
                }
            }]
        });
        DocPanel.superclass.initComponent.call(this);
    },

    directLink : function(){
        var link = String.format(
            "<a href=\"{0}\" target=\"_blank\">{0}</a>",
            document.location.href+'?class='+this.cclass
        );
        Ext.Msg.alert('Direct Link to ' + this.cclass,link);
    },
    
    scrollToMember : function(member){
        var el = Ext.fly(this.cclass + '-' + member);
        if(el){
            var top = (el.getOffsetsTo(this.body)[1]) + this.body.dom.scrollTop;
            this.body.scrollTo('top', top-25, {duration:0.75, callback: this.hlMember.createDelegate(this, [member])});
        }
    },

	scrollToSection : function(id){
		var el = Ext.getDom(id);
		if(el){
			var top = (Ext.fly(el).getOffsetsTo(this.body)[1]) + this.body.dom.scrollTop;
			this.body.scrollTo('top', top-25, {duration:0.5, callback: function(){
                Ext.fly(el).next('h2').pause(0.2).highlight('#8DB2E3', {attr:'color'});
            }});
        }
	},

    hlMember : function(member){
        var el = Ext.fly(this.cclass + '-' + member);
        if(el){
            if (tr = el.up('tr')) {
                tr.highlight('#cadaf9');
            }
        }
    }
});


MainPanel = function(){
	
	this.searchStore = new Ext.data.Store({
        proxy: new Ext.data.ScriptTagProxy({
            url: 'http://extjs.com/playpen/api.php'
        }),
        reader: new Ext.data.JsonReader({
	            root: 'data'
	        }, 
			['cls', 'member', 'type', 'doc']
		),
		baseParams: {},
        listeners: {
            'beforeload' : function(){
                this.baseParams.qt = Ext.getCmp('search-type').getValue();
            }
        }
    }); 
	
    MainPanel.superclass.constructor.call(this, {
        id:'doc-body',
        region:'center',
        margins:'0 5 5 0',
        resizeTabs: true,
        minTabWidth: 135,
        tabWidth: 135,
        plugins: new Ext.ux.TabCloseMenu(),
        enableTabScroll: true,
        activeTab: 0,

        items: {
            id:'welcome-panel',
            title: 'API Home',
            autoLoad: {url: 'welcome.html', callback: this.initSearch, scope: this},
            iconCls:'icon-docs',
            autoScroll: true,
			tbar: [
				'Search: ', ' ',
                new Ext.ux.SelectBox({
                    listClass:'x-combo-list-small',
                    width:90,
                    value:'Starts with',
                    id:'search-type',
                    store: new Ext.data.SimpleStore({
                        fields: ['text'],
                        expandData: true,
                        data : ['Starts with', 'Ends with', 'Any match']
                    }),
                    displayField: 'text'
                }), ' ',
                new Ext.app.SearchField({
	                width:240,
					store: this.searchStore,
					paramName: 'q'
	            })
            ]
        }
    });
};

Ext.extend(MainPanel, Ext.TabPanel, {

    initEvents : function(){
        MainPanel.superclass.initEvents.call(this);
        this.body.on('click', this.onClick, this);
    },

    onClick: function(e, target){
        if(target = e.getTarget('a:not(.exi)', 3)){
            var cls = Ext.fly(target).getAttributeNS('ext', 'cls');
            e.stopEvent();
            if(cls){
                var member = Ext.fly(target).getAttributeNS('ext', 'member');
                this.loadClass(target.href, cls, member);
            }else if(target.className == 'inner-link'){
                this.getActiveTab().scrollToSection(target.href.split('#')[1]);
            }else{
                window.open(target.href);
            }
        }else if(target = e.getTarget('.micon', 2)){
            e.stopEvent();
            var tr = Ext.fly(target.parentNode);
            if(tr.hasClass('expandable')){
                tr.toggleClass('expanded');
            }
        }
    },

    loadClass : function(href, cls, member){
        var id = 'docs-' + cls;
        var tab = this.getComponent(id);
        if(tab){
            this.setActiveTab(tab);
            if(member){
                tab.scrollToMember(member);
            }
        }else{
            var autoLoad = {url: href};
            if(member){
                autoLoad.callback = function(){
                    Ext.getCmp(id).scrollToMember(member);
                }
            }
            var p = this.add(new DocPanel({
                id: id,
                cclass : cls,
                autoLoad: autoLoad,
                iconCls: Docs.icons[cls]
            }));
            this.setActiveTab(p);
        }
    },
	
	initSearch : function(){
		// Custom rendering Template for the View
	    var resultTpl = new Ext.XTemplate(
	        '<tpl for=".">',
	        '<div class="search-item">',
	            '<a class="member" ext:cls="{cls}" ext:member="{member}" href="output/{cls}.html">',
				'<img src="../resources/images/default/s.gif" class="item-icon icon-{type}"/>{member}',
				'</a> ',
				'<a class="cls" ext:cls="{cls}" href="output/{cls}.html">{cls}</a>',
	            '<p>{doc}</p>',
	        '</div></tpl>'
	    );
		
		var p = new Ext.DataView({
            applyTo: 'search',
			tpl: resultTpl,
			loadingText:'Searching...',
            store: this.searchStore,
            itemSelector: 'div.search-item',
			emptyText: '<h3>Use the search field above to search the Ext API for classes, properties, config options, methods and events.</h3>'
        });
	},
	
	doSearch : function(e){
		var k = e.getKey();
		if(!e.isSpecialKey()){
			var text = e.target.value;
			if(!text){
				this.searchStore.baseParams.q = '';
				this.searchStore.removeAll();
			}else{
				this.searchStore.baseParams.q = text;
				this.searchStore.reload();
			}
		}
	}
});


Ext.onReady(function(){

    Ext.QuickTips.init();

    var api = new ApiPanel();
    var mainPanel = new MainPanel();

    api.on('click', function(node, e){
         if(node.isLeaf()){
            e.stopEvent();
            mainPanel.loadClass(node.attributes.href, node.id);
         }
    });

    mainPanel.on('tabchange', function(tp, tab){
        api.selectClass(tab.cclass); 
    });

    var viewport = new Ext.Viewport({
        layout:'border',
        items:[ {
            cls: 'docs-header',
            height: 44,
            region:'north',
            xtype:'box',
            el:'header',
            border:false,
            margins: '0 0 5 0'
        }, api, mainPanel ]
    });

    api.expandPath('/root/apidocs');

    // allow for link in
    var page = window.location.href.split('?')[1];
    if(page){
        var ps = Ext.urlDecode(page);
        var cls = ps['class'];
        mainPanel.loadClass('output/' + cls + '.html', cls, ps.member);
    }
    
    viewport.doLayout();
	
	setTimeout(function(){
        Ext.get('loading').remove();
        Ext.get('loading-mask').fadeOut({remove:true});
    }, 250);
	
});


Ext.app.SearchField = Ext.extend(Ext.form.TwinTriggerField, {
    initComponent : function(){
        if(!this.store.baseParams){
			this.store.baseParams = {};
		}
		Ext.app.SearchField.superclass.initComponent.call(this);
		this.on('specialkey', function(f, e){
            if(e.getKey() == e.ENTER){
                this.onTrigger2Click();
            }
        }, this);
    },

    validationEvent:false,
    validateOnBlur:false,
    trigger1Class:'x-form-clear-trigger',
    trigger2Class:'x-form-search-trigger',
    hideTrigger1:true,
    width:180,
    hasSearch : false,
    paramName : 'query',

    onTrigger1Click : function(){
        if(this.hasSearch){
            this.store.baseParams[this.paramName] = '';
			this.store.removeAll();
			this.el.dom.value = '';
            this.triggers[0].hide();
            this.hasSearch = false;
			this.focus();
        }
    },

    onTrigger2Click : function(){
        var v = this.getRawValue();
        if(v.length < 1){
            this.onTrigger1Click();
            return;
        }
		if(v.length < 2){
			Ext.Msg.alert('Invalid Search', 'You must enter a minimum of 2 characters to search the API');
			return;
		}
		this.store.baseParams[this.paramName] = v;
        var o = {start: 0};
        this.store.reload({params:o});
        this.hasSearch = true;
        this.triggers[0].show();
		this.focus();
    }
});


/**
 * Makes a ComboBox more closely mimic an HTML SELECT.  Supports clicking and dragging
 * through the list, with item selection occurring when the mouse button is released.
 * When used will automatically set {@link #editable} to false and call {@link Ext.Element#unselectable}
 * on inner elements.  Re-enabling editable after calling this will NOT work.
 *
 * @author Corey Gilmore
 * http://extjs.com/forum/showthread.php?t=6392
 *
 * @history 2007-07-08 jvs
 * Slight mods for Ext 2.0
 */
Ext.ux.SelectBox = function(config){
	this.searchResetDelay = 1000;
	config = config || {};
	config = Ext.apply(config || {}, {
		editable: false,
		forceSelection: true,
		rowHeight: false,
		lastSearchTerm: false,
        triggerAction: 'all',
        mode: 'local'
    });

	Ext.ux.SelectBox.superclass.constructor.apply(this, arguments);

	this.lastSelectedIndex = this.selectedIndex || 0;
};

Ext.extend(Ext.ux.SelectBox, Ext.form.ComboBox, {
    lazyInit: false,
	initEvents : function(){
		Ext.ux.SelectBox.superclass.initEvents.apply(this, arguments);
		// you need to use keypress to capture upper/lower case and shift+key, but it doesn't work in IE
		this.el.on('keydown', this.keySearch, this, true);
		this.cshTask = new Ext.util.DelayedTask(this.clearSearchHistory, this);
	},

	keySearch : function(e, target, options) {
		var raw = e.getKey();
		var key = String.fromCharCode(raw);
		var startIndex = 0;

		if( !this.store.getCount() ) {
			return;
		}

		switch(raw) {
			case Ext.EventObject.HOME:
				e.stopEvent();
				this.selectFirst();
				return;

			case Ext.EventObject.END:
				e.stopEvent();
				this.selectLast();
				return;

			case Ext.EventObject.PAGEDOWN:
				this.selectNextPage();
				e.stopEvent();
				return;

			case Ext.EventObject.PAGEUP:
				this.selectPrevPage();
				e.stopEvent();
				return;
		}

		// skip special keys other than the shift key
		if( (e.hasModifier() && !e.shiftKey) || e.isNavKeyPress() || e.isSpecialKey() ) {
			return;
		}
		if( this.lastSearchTerm == key ) {
			startIndex = this.lastSelectedIndex;
		}
		this.search(this.displayField, key, startIndex);
		this.cshTask.delay(this.searchResetDelay);
	},

	onRender : function(ct, position) {
		this.store.on('load', this.calcRowsPerPage, this);
		Ext.ux.SelectBox.superclass.onRender.apply(this, arguments);
		if( this.mode == 'local' ) {
			this.calcRowsPerPage();
		}
	},

	onSelect : function(record, index, skipCollapse){
		if(this.fireEvent('beforeselect', this, record, index) !== false){
			this.setValue(record.data[this.valueField || this.displayField]);
			if( !skipCollapse ) {
				this.collapse();
			}
			this.lastSelectedIndex = index + 1;
			this.fireEvent('select', this, record, index);
		}
	},

	render : function(ct) {
		Ext.ux.SelectBox.superclass.render.apply(this, arguments);
		if( Ext.isSafari ) {
			this.el.swallowEvent('mousedown', true);
		}
		this.el.unselectable();
		this.innerList.unselectable();
		this.trigger.unselectable();
		this.innerList.on('mouseup', function(e, target, options) {
			if( target.id && target.id == this.innerList.id ) {
				return;
			}
			this.onViewClick();
		}, this);

		this.innerList.on('mouseover', function(e, target, options) {
			if( target.id && target.id == this.innerList.id ) {
				return;
			}
			this.lastSelectedIndex = this.view.getSelectedIndexes()[0] + 1;
			this.cshTask.delay(this.searchResetDelay);
		}, this);

		this.trigger.un('click', this.onTriggerClick, this);
		this.trigger.on('mousedown', function(e, target, options) {
			e.preventDefault();
			this.onTriggerClick();
		}, this);

		this.on('collapse', function(e, target, options) {
			Ext.getDoc().un('mouseup', this.collapseIf, this);
		}, this, true);

		this.on('expand', function(e, target, options) {
			Ext.getDoc().on('mouseup', this.collapseIf, this);
		}, this, true);
	},

	clearSearchHistory : function() {
		this.lastSelectedIndex = 0;
		this.lastSearchTerm = false;
	},

	selectFirst : function() {
		this.focusAndSelect(this.store.data.first());
	},

	selectLast : function() {
		this.focusAndSelect(this.store.data.last());
	},

	selectPrevPage : function() {
		if( !this.rowHeight ) {
			return;
		}
		var index = Math.max(this.selectedIndex-this.rowsPerPage, 0);
		this.focusAndSelect(this.store.getAt(index));
	},

	selectNextPage : function() {
		if( !this.rowHeight ) {
			return;
		}
		var index = Math.min(this.selectedIndex+this.rowsPerPage, this.store.getCount() - 1);
		this.focusAndSelect(this.store.getAt(index));
	},

	search : function(field, value, startIndex) {
		field = field || this.displayField;
		this.lastSearchTerm = value;
		var index = this.store.find.apply(this.store, arguments);
		if( index !== -1 ) {
			this.focusAndSelect(index);
		}
	},

	focusAndSelect : function(record) {
		var index = typeof record === 'number' ? record : this.store.indexOf(record);
		this.select(index, this.isExpanded());
		this.onSelect(this.store.getAt(record), index, this.isExpanded());
	},

	calcRowsPerPage : function() {
		if( this.store.getCount() ) {
			this.rowHeight = Ext.fly(this.view.getNode(0)).getHeight();
			this.rowsPerPage = this.maxHeight / this.rowHeight;
		} else {
			this.rowHeight = false;
		}
	}

});

Ext.Ajax.on('requestcomplete', function(ajax, xhr, o){
    if(typeof urchinTracker == 'function' && o && o.url){
        urchinTracker(o.url);
    }
});