function changeHashOnScroll()

in fauxton-visual-guide/js/main.js [83:144]

• 3 lines of code
• 1 McCabe index (conditional complexity)

function changeHashOnScroll() {
  //http://stackoverflow.com/questions/5315659/jquery-change-hash-fragment-identifier-while-scrolling-down-page
  
  var timer = null;
  $(window).scroll(function (e) {
    $('div.chapter').each(function () {
      if (
        $(this).offset().top < window.pageYOffset + 10
        //begins before top
        && $(this).offset().top + $(this).height() > window.pageYOffset + 10
        //but ends in visible area
        //+ 20 allows you to change hash before it hits the top border
      ){

        history.replaceState(null, null, "#" + $(this).attr('id'));
        highlightFauxtonNavigation();

        if ($('#_all_dbs').visible(true)) {
          clear();
          $('#_all_dbs-sub').css({
            'color': 'black',
            'font-weight': 'bold'
          });
        }
        

        if ($('#_all_docs').visible(true)) {
          clear();
          $('#_all_docs-sub').css({
            'color': 'black',
            'font-weight': 'bold'
          });
          return;
        }

        if ($('#editor').visible(true)) {
          clear();
          $('#editor-sub').css({
            'color': 'black',
            'font-weight': 'bold'
          });
          return;
        }

        if ($('#db-action').visible(true)) {
          clear();
          $('#db-actions-sub').css({
            'color': 'black',
            'font-weight': 'bold'
          });
        }
      }
    });
  });

  function clear () {
    $('#db-actions-sub, #_all_docs-sub, #editor-sub, #_all_dbs-sub').css({
      'color': '',
      'font-weight': ''
    });
  }
}