ext的button返回值问题，来者又分！！！！！！！！！

Question

 buttons: [{
            text: 'Save',
            handler: function(){
                if(fp.getForm().isValid()){
                fp.getForm().submit({
                    url: 'file-uploadServlet',
                    waitMsg: 'Uploading your photo...',
                    success: function(fp, o){
                        msg('Success', 'Processed file "'+o.result.file+'" on the server');
                    }
                });
                }
            }
        }
这个是ext的一段代码,file-uploadServlet到了这个servlet文件已经上传完毕了，但是我后台怎么告诉前台js我上传成功，让success=true执行括号内的语句并且waitMsg去除等待呢

Answer 1

有个例子，自己看下吧
Ext.namespace("testdomain");
Ext.onReady(function(){
    Ext.BLANK_IMAGE_URL="../../img/s.gif";    
    var viewport = new Ext.Viewport({
        layout: 'border',
        items: [{
            
            region: 'center',
            tbar:[{
                text:'测试',
                handler:function(){
                var file = new Ext.form.TextField({
                    fieldLabel: '流程信息',
                    labelStyle: 'width:60px',
                    anchor:'80%',
                    inputType: 'file'//文件类型
                });        
                var panelFile = new Ext.form.FormPanel({
                    labelAlign: 'right',
                    labelWidth: 60,
                    frame:true,
                    border:false,
                    fileUpload: true,
                    enctype:'multipart/form-data',
                    method:'POST',
                    width: 380,
                    items: [file],
                    buttons: [{
                        text: '确定',
                        handler: function() {
                            if(file.getValue()==""){
                                Ext.MessageBox.alert('警告', "请选择需要导入的流程信息!");
                                return;
                            }
//                            var reg = /\.txt$|\.xml$/i;
//                            if(file.getValue().match(reg)==null){
//                                Ext.MessageBox.alert('警告', "请选择“txt”或者“xml”格式的文件!");
//                                return;
//                            }
                            win.hide();
                            
                            panelFile.getForm().submit({   
                                url:'/TestWeb/TestAction.do?method=upload',
                                params:{},
                                success:function(form,action){ 
                                    Ext.MessageBox.alert("提示 ","success");
                                },   
                                failure:function(form,action){ 
                                    Ext.MessageBox.alert("警告","failure"); 
                                }   
                            });
                        }
                    }]
                });
                var win=new Ext.Window({
                    title:'导入文件',
                    width:320,
                    height:160,
                    closable:true,
                    maximizable:true,
                    plain: false,
                    border:false,
                    modal:true,
                    items:[panelFile]
                });
                win.show();
            }
            }]
            
        }] 
    });    
});

Answer 2

后台返回一个 {"success":true,"message":xxx}的json字符串 ext会执行 success的function