javascript - Navbar with fixed position staying on the top while header disappear -

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i want make navbar fixed position. @ top of page navbar should under header , after scrolling down when header no longer visible navbar should @ top of page. how can that? when try after scrolling down between navbar , top of page still height of header(even though no longer visible).

here css:

header{   background-color: red;   width: 100%;   height: 100px; } nav{   position: fixed;     float:left;   height: 100px;   width: 100px;     margin-left: 10px;     margin-right: 50px;     margin-top:50px;     background-color: green;   } main{  background-color: blue; height: 1500px; margin-left:15%; margin-right:5%; margin-top:50px;  }

and jfiddle: https://jsfiddle.net/pg2kwk5e/

you can add class nav element javascript after scrolling amount.

i've used jquery it's faster , easier show in action.

example

i'm adding class .fixedtop nav after window scrolls more 150 pixels, class has top:0;margin0; move absolute positioned element top , remove margin set before.

code:

var $nav = $("nav"),   $(window).scroll(function() {   if($(this).scrolltop() > 150) {      $nav.addclass('fixedtop');   } else {      $nav.removeclass('fixedtop');   }  })

css:

.fixedtop {   top: 0;   margin: 0 !important; }

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