JQuery detect if div is visible during scroll -

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i'm using jquery mouse wheel in project manipulate scroll on specific div.

var viewwidth = $(window).width(); var temoignageswidth = $('#temoignages .container-fluid').width(); var maxscrolltemoignages = temoignageswidth - viewwidth; var scrollval = 0; var temoignagesdiv = gettemoignagesdiv();  $(window).mousewheel(function(event){     if (temoignagesdiv.top <= $(window).scrolltop() + navbarheight && $(window).scrolltop() + $(window).height() < temoignagesdiv.bot){         scrollval += math.round(event.deltay * event.deltafactor);          var scrollup = function(scrollval){             return scrollval <= 0;         };         var scrolldown = function(scrollval){             return math.abs(scrollval) <= maxscrolltemoignages;         };          var condition = null;         if (event.deltay > 0){             scrollval = scrollup(scrollval) ? scrollval : 0;             condition = scrollup(scrollval);         } else{             scrollval = scrolldown(scrollval) ? scrollval : maxscrolltemoignages * -1;             condition = scrolldown(scrollval);     }          if (condition){             if (event.deltay > 0 && scrollval < 0){                 event.preventdefault();             } else if (event.deltay < 0 && math.abs(scrollval) < maxscrolltemoignages ){                 event.preventdefault();             }              $('#temoignages .row').css({                 "-webkit-transform":"translate(" + scrollval + "px)",                  "-ms-transform":"translate(" + scrollval + "px)",                   "transform":"translate(" + scrollval + "px)"             });         }     } });

it work's when scroll condition temoignagesdiv.top <= $(window).scrolltop() + navbarheight && $(window).scrolltop() + $(window).height() < temoignagesdiv.bot not validate code not executed. idea improve ? :s


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