fadeout effect not working

i want to load new data after fading out effect.

callback:function(data)
{
 parent.fadeOut('slow').delay(5000);
 $('#div_one').html(data);
 modal_message();
                                                            },

if i remove $('#di开发者_如何转开发v_one').html(data),

then fading effect will work. but if i keep this sentence fading effect is not working

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Provide a callback function to fadeOut like this:

parent.fadeOut('slow', function(){
  // your code to load data
});