javascript - Show footer when reaching bottom of page -

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i saw similar questions, didn't give me solution. footer show (slideup) when reaching bottom of page , hide again when scrolling towards top. i'm using script shows footer after amount of scrolling.

here fiddle

does know how? 

$(window).scroll(function() { if ($(this).scrolltop() > 10) {     $( 'footer').slidedown(300); } else {     console.log('there');     $('footer').slideup(300); } }); 

    var height;      var trigger = 350;      $(window).scroll(function() {          height = $(document).height()-$(window).height();          console.log(height+" "+$(this).scrolltop());      	if ($(this).scrolltop() > height - trigger) {      		$( 'footer').slidedown(300);      	} else {      		$('footer').slideup(300);      	}      });

for better performance, put window height calculation , document height calculation outside of scroll function , run instead once after load ($(){}) , recalculate on window resize ($(window).resize(function(){})


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