javascript - how to center modal window with body hidden after scroll? -

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i have model dialog, while model dialog open setting body overflow:hidden makes model window display half only. onclose resetting body overflow.

body height more window size , scrolled open modal dialog.

how center display modal dialog?

enter image description here

as option, can create function position modal depending on window size, this:

something this: 

    function repositionmodal(modal){     var windoww = $(window).width(),         windowh = $(window).height(),         modalw = modal.width(),         modalh = modal.height();      if (modalw>windoww) modal.width(windoww);     if (modalh>windowh) modal.height(windowh);     modal.css({         "top": (windowh-modalh)/2)+"px",         "left": (windoww-modalw)/2)+"px"     });     }

then call function when modal invoked, and, on window resize

$(window).resize(function(){      if($(".my-modal").is(:visible)){          repositionmodal($(".my-modal"))      } })

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