Extjs filefield관련 참고 예제(파일업로드)

var formPanel = Ext.create('Ext.form.Panel', {
    renderTo: 'testdiv',
    title: 'MyForm',
    id: 'testCase',
    items: [
        {
            xtype: 'textfield',
            name: 'title',
            fieldLabel: 'Title'
        },
        {
            xtype: 'panel',
            layout: 'fit',
            border: false,
            items: [{
                xtype: 'filefield',
                buttonOnly: true,
                name: 'file',
                onChange: function(value) {
                    var panel = this.ownerCt;
                    formPanel.submit({
                        url: 'upload.json',
                        waitMsg: 'Uploading the image ..',
                        clientValidation: false,
                        success: Ext.Function.bind(panel.onSuccess, panel)
                    });                    
                }
            }],
            onSuccess: function(form, action) {
                if (action.result.success !== true) {
                    return;
                }

                this.removeAll();
                this.add({ 
                    xtype: 'label',
                    text: 'File upload was successful'
                });
                this.add({ 
                    xtype: 'hidden',
                    name: 'file',
                    value: action.result.fileid
                });
            }
        }
    ]
});