Ext 解决文本框 输入空格 提交按钮还是灰色

        <script type="text/javascript">
Ext.onReady(function(){
 Ext.QuickTips.init();
    Ext.form.Field.prototype.msgTarget = 'side';// 提示的方式,枚举值为"qtip","title","under","side", 

 function notNull(text){
         if(this.allowBlank==false && Ext.util.Format.trim(text).length==0){
              return false;      
        }else{       
             return true;
       }
 }

    var form = new Ext.form.FormPanel({
        defaultType: 'textfield',
        labelAlign: 'right',
        title: 'form',
        labelWidth: 50,
        frame:true,
        width: 220,
        monitorValid:true,
        items: [{
            fieldLabel: '文本框',
            allowBlank:false,
            blankText:"该项必须输入",
            invalidText :"该项必须输入",
            validator:notNull
        }],
        buttons: [{
            text: '提交',

            formBind:true,
            handler: function() {
                            alert("即将提交");
              });
            }
        }]
    });
    form.render("form");

});
        </script>
    </head>
    <body>
        <div id="form"></div>
    </body>
</html>

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