MessageBox: ensure to get input element
MessageBox: ensure to get input element

huguangju/element,Leopoldthecoder/element-1,baiyaaaaa/element,ElemeFE/element,Leopoldthecoder/element-1,baiyaaaaa/element,ElemeFE/element,Kingwl/element,Raganof/element,huguangju/element,Kingwl/element,Raganof/element