漂亮的树Tree控件代码

Ext.TreeComboField=Ext.extend(Ext.form.TriggerField,{      
     valueField:"id",      
     displayField:"name",      
     haveShow:false,      
     editable:false,      
     onTriggerClick : function(){      
        if(!this.tree.rendered)      
        {      
        this.treeId = Ext.id();      
        panel.id = this.treeId;      
        this.getEl().dom.parentNode.appendChild(panel);      
        this.tree.render(this.treeId);      
        this.tree.setWidth(this.width);      
        this.tree.getEl().alignTo(this.getEl(), "tl-bl");         
        }          
        this.tree.show();      
     },      
     initComponent : function(){      
        Ext.TreeComboField.superclass.initComponent.call(this);      
             
     },      
     onRender : function(ct, position){      
        Ext.TreeComboField.superclass.onRender.call(this, ct, position);              
        this.tree.on("click",this.choice,this);      
        if(this.hiddenName){      
            this.hiddenField = this.el.insertSibling({tag:'input', type:'hidden', name: this.hiddenName, id: (this.hiddenId||this.hiddenName)},      
                    'before', true);      
            this.hiddenField.value =      
                this.hiddenValue !== undefined ? this.hiddenValue :this.value !== undefined ? this.value : '';      
            this.el.dom.removeAttribute('name');      
        }      
         if(!this.editable){      
            this.editable = true;      
            this.setEditable(false);      
        }      
     },      
     getValue : function(){             
       return typeof this.value != 'undefined' ? this.value : '';              
    },      
    clearValue : function(){      
        if(this.hiddenField){      
            this.hiddenField.value = '';      
        }      
        this.setRawValue('');      
        this.lastSelectionText = '';      
        this.applyEmptyText();      
    },      
    readPropertyValue:function(obj,p)      
    {      
        var v=null;      
        for(var o in obj)      
        {      
            if(o==p)v=obj[o];      
        }      
        return v;      
    },      
    setValue : function(obj){         
        if(!obj){      
            this.clearValue();      
            return;      
        }      
        var v=obj;        
        var text = v;      
        var value=this.valueField||this.displayField;      
       if(typeof v=="object" && this.readPropertyValue(obj,value)){      
            text=obj[this.displayField||this.valueField];      
            v=obj[value];             
        }      
        var node = this.tree.getNodeById(v);            
        if(node){      
                text = node.text;      
            }else if(this.valueNotFoundText !== undefined){      
                text = this.valueNotFoundText;      
            }      
        this.lastSelectionText = text;      
        if(this.hiddenField){      
            this.hiddenField.value = v;      
        }      
       Ext.TreeComboField.superclass.setValue.call(this, text);      
       this.value = v;      
    },      
     setEditable : function(value){      
        if(value == this.editable){      
            return;      
        }      
        this.editable = value;      
        if(!value){      
            this.el.dom.setAttribute('readOnly', true);      
            this.el.on('mousedown', this.onTriggerClick,  this);      
            this.el.addClass('x-combo-noedit');      
        }else{      
            this.el.dom.setAttribute('readOnly', false);      
            this.el.un('mousedown', this.onTriggerClick,  this);      
            this.el.removeClass('x-combo-noedit');      
        }      
    },      
    choice:function(node,eventObject)      
    {      
    if(node.id!="root") this.setValue(node.id);      
    else this.clearValue();      
    this.tree.hide();      
    },            
    onDestroy : function(){      
    if(this.tree.rendered){      
       this.tree.getEl().remove();      
      }      
    Ext.TreeComboField.superclass.onDestroy.call(this);      
    }      
});      
Ext.reg('treecombo', Ext.TreeComboField);