extjs 3.4下拉树扩展

根据[Ext 3.x + Ext 2.x] 下拉树 Ext.ux.ComboBoxTree文章最后2个人反馈点击+号展开节点时列表框消失的情况自己体验了下。确实有这个现象，应该是3.x的有这个问题，2.x正常，现在修改代码如下解决这个问题

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Ext.ux.ComboBoxTree = function(){this.treeId = Ext.id()+'-tree';this.maxHeight = arguments[0].maxHeight || arguments[0].height || this.maxHeight;this.tpl = new Ext.Template('<tpl for="."><div style="height:'+this.maxHeight+'px"><div id="'+this.treeId+'"></div></div></tpl>');this.store = new Ext.data.SimpleStore({fields:[],data:[[]]});this.selectedClass = '';this.mode = 'local';this.triggerAction = 'all';this.onSelect = Ext.emptyFn;this.editable = false;this.beforeBlur = Ext.emptyFn;//all:所有结点都可选中//exceptRoot：除根结点，其它结点都可选（默认）//folder:只有目录（非叶子和非根结点）可选//leaf：只有叶子结点可选this.selectNodeModel = arguments[0].selectNodeModel || 'exceptRoot';this.addEvents('afterchange');Ext.ux.ComboBoxTree.superclass.constructor.apply(this, arguments);}Ext.extend(Ext.ux.ComboBoxTree,Ext.form.ComboBox, {expand : function(){Ext.ux.ComboBoxTree.superclass.expand.call(this);if(this.tree.rendered){return;}Ext.apply(this.tree,{height:this.maxHeight, width:(this.listWidth||this.width-(Ext.isIE?3:0))-2, border:false, autoScroll:true});if(this.tree.xtype){this.tree = Ext.ComponentMgr.create(this.tree, this.tree.xtype);}this.tree.render(this.treeId);var root = this.tree.getRootNode();if(!root.isLoaded())root.reload();this.tree.on('click',function(node){var selModel = this.selectNodeModel;var isLeaf = node.isLeaf();if((node == root) && selModel != 'all'){return;}else if(selModel=='folder' && isLeaf){return;}else if(selModel=='leaf' && !isLeaf){return;}var oldNode = this.getNode();if(this.fireEvent('beforeselect', this, node, oldNode) !== false) {this.setValue(node);this.collapse();this.fireEvent('select', this, node, oldNode);(oldNode !== node) ? this.fireEvent('afterchange', this, node, oldNode) : '';}}, this);    },    setValue : function(node){this.node = node;        var text = node.text;        this.lastSelectionText = text;        if(this.hiddenField){            this.hiddenField.value = node.id;        }        Ext.form.ComboBox.superclass.setValue.call(this, text);        this.value = node.id;    },        getValue : function(){    return typeof this.value != 'undefined' ? this.value : '';    },getNode : function(){return this.node;},clearValue : function(){Ext.ux.ComboBoxTree.superclass.clearValue.call(this);        this.node = null;    },// 重写onViewClick，使展开树结点是不关闭下拉框      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();          }      },  // private    destroy: function() {Ext.ux.ComboBoxTree.superclass.destroy.call(this);Ext.destroy([this.node,this.tree]);delete this.node;    }});Ext.reg('combotree', Ext.ux.ComboBoxTree);