Ext combobox的specialkey()如何用 _Ajax

Ext combobox的specialkey()怎么用 - Web 开发 / Ajax
如题，
当我按下Backspace键的时候调用。
specialkey()这个怎么用。。。。
不太懂。。求大神解答

------解决方案--------------------
坐等 hookee 来解决
------解决方案--------------------
Backspace 并不属于 specialkey
用keydown侦听

HTML code


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<link rel="stylesheet" type="text/css" href="extjs/resources/css/ext-all.css" />
<script type="text/javascript" src="extjs/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="extjs/ext-all.js"></script>
<script>
Ext.onReady(function(){
    oForm    = new Ext.FormPanel({
        renderTo:"form_panel",
        layout:"form",
        hideLabels:false,
        border:false,
        items:[
            {fieldLabel:'性别',enableKeyEvents:true,id:'sel_gender',name:'sel_gender',xtype:'combo',store:[[0,'女'],[1,'男']],editable:false,hiddenName:'gender',forceSelection:true,mode:'local',triggerAction:'all',value:'1',
                listeners:{
                    keydown:function(obj, e){
                        if(e.getKey()==8){
                            alert("ok");
                            e.stopEvent();
                            return false;
                        }
                    }
                }
            }
        ]
    });
    Ext.getCmp('sel_gender').focus();
});
</script>
<div id="form_panel"></div>