Sticky header on mobile browser

问题

I need a sticky header on a mobile browser. I'm currently using this jquery script:

<script>
  $(function(){
    var stickyHeader = $('#persist-wrap').offset().top;
    $(window).scroll(function(){
      if( $(window).scrollTop() > stickyHeader ) {
        $('#persist-wrap').addClass("sticky");
      } else {
        $('#persist-wrap').removeClass("sticky");
      }
    });
  });
</script>

with this CSS code:

.sticky {
  position: fixed;
  top: 0;
}

The header has an id of persist-wrap. This works fine on a desktop browser but not at all on a mobile browser.

Any ideas?

回答1:

I've tweaked your example a little and it works for me on the Samsung Galaxy S2 running ICS and iPad 3 running iOS 6.01: (don't have any others to hand to test it on).

List of changes

I cached all the objects that were used multiple times.
Changed it so its a reusable function accepting a parameter of an object so it can be applied multiple times (this could be tweaked to accept multiple objects at once).

Here's the example:

$(function(){
  
	createSticky(jQuery("#header"));

});

function createSticky(sticky) {
	
	if (typeof sticky !== "undefined") {

		var	pos = sticky.offset().top,
				win = jQuery(window);
			
		win.on("scroll", function() {
    		win.scrollTop() >= pos ? sticky.addClass("fixed") : sticky.removeClass("fixed");      
		});			
	}
}

#header {
	background: #666;
	padding: 3px;
  padding: 10px 20px;
  color: #fff;
}
#header.fixed {
	position: fixed;
	top: 0;
	width: 100%;
}


/* For aesthetics only */
				
body {
	margin: 0;
    height: 10000px;
	font-family: Segoe, "Segoe UI", "DejaVu Sans", "Trebuchet MS", Verdana, sans-serif;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Some Text before the header</p>
<div id="header">
  Home
</div>

来源：https://stackoverflow.com/questions/12573532/sticky-header-on-mobile-browser

标签

jquery

css

sticky