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Smooth Scroll to Top Function

/ Published in: jQuery
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Hides the button based on scroll position, fades in and out as necessary and upon click smoothly scrolls back to the top.

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Copy this code and paste it in your HTML 
  1. $(document).ready(function() {
  2.  
  3.     // hide #back-top first
  4.     $("#back-top").hide();
  5.  
  6.     // fade in #back-top
  7.     $(function() {
  8.         $(window).scroll(function() {
  9.             if ($(this).scrollTop() > 100) {
  10.                 $('#back-top').fadeIn();
  11.             } else {
  12.                 $('#back-top').fadeOut();
  13.             }
  14.         });
  15.  
  16.         // scroll body to 0px on click
  17.         $('#back-top a').click(function() {
  18.             $('body,html').animate({
  19.                 scrollTop: 0
  20.             }, 800);
  21.             return false;
  22.         });
  23.     });
  24.  
  25. });​
  26.  
  27.  
  28. HTML USAGE:
  29.  
  30. <p id="back-top" style="display: block; ">
  31.    <a href="#top"><span></span><em>Back to top</em></a>
  32. </p>

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