javascript - track resizing of element -

i have iframe auto height. , height not fixed. how track it's resizing?

i need this:

$('iframe').resize(function(){ alert($(this).height()); }); 

see http://benalman.com/projects/jquery-resize-plugin/

http://benalman.com/code/projects/jquery-resize/examples/resize/

they have example called resizing iframe content grows

if can't apply iframe reason use wrapper

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this has been asked couple of times , recommends plugin

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