javascript - How can I shrink a header animated when I scroll down and enlarge it when I scroll up? -


i'm going build me website. thought nice if header shrinking litte bit when i'm scrolling down 30px. of course should enlarge again when i'm scrolling top. , thats problem. can not find out how increase header again! here jquery code shrink effect:

$(document).ready(function() {  $(window).scroll(function() {   var top = $(document).scrolltop();   if (top > 30) {     $("#header").animate({height:50}, 200);    $("#header").animate({opacity:0.5}, 200);    $("#logoimage").animate({height:40}, 200);    $("#logoimage").delay(20).queue(function() { $(this).css({'margin-top':'20px'});           $(this).dequeue();});     }  })});

i've created page on jsfiddle can show mean: http://jsfiddle.net/xuryon/s46zzkt2/

i hope knows how solve problem...

this should : http://jsfiddle.net/gmdxs42t/

$(document).ready(function() { var fflag = true; $(window).scroll(function() {     var top = $(document).scrolltop();     if (top > 30 && fflag) {        fflag = false; //will stop re-entry on every px scrolled        $("#header").animate({height:50}, 200);        $("#header").animate({opacity:0.5}, 200);    }     if (top<30 && !fflag){ //will occur when scroll reached top        fflag=true; //will enable above condition entry when top exceeds 30        $("#header").animate({height:100}, 200);        $("#header").animate({opacity:1}, 200);       }  })});

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