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sajaniemi_variable_dataset_large / pool /shard007 /JavaScript /0044038_jquery.scrollagent.js

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/*! jQuery.scrollagent (c) 2012, Rico Sta. Cruz. MIT License.
 *  https://github.com/rstacruz/jquery-stuff/tree/master/scrollagent */

// Call $(...).scrollagent() with a callback function.
//
// The callback will be called everytime the focus changes.
//
// Example:
//
//      $("h2").scrollagent(function(cid, pid, currentElement, previousElement) {
//        if (pid) {
//          $("[href='#"+pid+"']").removeClass('active');
//        }
//        if (cid) {
//          $("[href='#"+cid+"']").addClass('active');
//        }
//      });

(function($) {

  $.fn.scrollagent = function(options, callback) {
    // Account for $.scrollspy(function)
    if (typeof callback === 'undefined') {
      callback = options;
      options = {};
    }

    var $sections = $(this);
    var $parent = options.parent || $(window);

    // Find the top offsets of each section
    var offsets = [];
    $sections.each(function(i) {
      var offset = $(this).attr('data-anchor-offset') ?
        parseInt($(this).attr('data-anchor-offset'), 10) :
        (options.offset || 0);

      offsets.push({
        top: $(this).offset().top + offset,
        id: $(this).attr('id'),
        index: i,
        el: this
      });
    });

    // State
    var current = null;
    var height = null;
    var range = null;

    // Save the height. Do this only whenever the window is resized so we don't
    // recalculate often.
    $(window).on('resize', function() {
      height = $parent.height();
      range = $(document).height();
    });

    // Find the current active section every scroll tick.
    $parent.on('scroll', function() {
      var y = $parent.scrollTop();
      y += height * (0.3 + 0.7 * Math.pow(y/range, 2));

      var latest = null;

      for (var i in offsets) {
        if (offsets.hasOwnProperty(i)) {
          var offset = offsets[i];
          if (offset.top < y) latest = offset;
        }
      }

      if (latest && (!current || (latest.index !== current.index))) {
        callback.call($sections,
          latest ? latest.id : null,
          current ? current.id : null,
          latest ? latest.el : null,
          current ? current.el : null);
        current = latest;
      }
    });

    $(window).trigger('resize');
    $parent.trigger('scroll');

    return this;
  };

})(jQuery);

	/*! jQuery.scrollagent (c) 2012, Rico Sta. Cruz. MIT License.
	* https://github.com/rstacruz/jquery-stuff/tree/master/scrollagent */

	// Call $(...).scrollagent() with a callback function.
	//
	// The callback will be called everytime the focus changes.
	//
	// Example:
	//
	// $("h2").scrollagent(function(cid, pid, currentElement, previousElement) {
	// if (pid) {
	// $("[href='#"+pid+"']").removeClass('active');
	// }
	// if (cid) {
	// $("[href='#"+cid+"']").addClass('active');
	// }
	// });

	(function($) {

	$.fn.scrollagent = function(options, callback) {
	// Account for $.scrollspy(function)
	if (typeof callback === 'undefined') {
	callback = options;
	options = {};
	}

	var $sections = $(this);
	var $parent = options.parent \|\| $(window);

	// Find the top offsets of each section
	var offsets = [];
	$sections.each(function(i) {
	var offset = $(this).attr('data-anchor-offset') ?
	parseInt($(this).attr('data-anchor-offset'), 10) :
	(options.offset \|\| 0);

	offsets.push({
	top: $(this).offset().top + offset,
	id: $(this).attr('id'),
	index: i,
	el: this
	});
	});

	// State
	var current = null;
	var height = null;
	var range = null;

	// Save the height. Do this only whenever the window is resized so we don't
	// recalculate often.
	$(window).on('resize', function() {
	height = $parent.height();
	range = $(document).height();
	});

	// Find the current active section every scroll tick.
	$parent.on('scroll', function() {
	var y = $parent.scrollTop();
	y += height * (0.3 + 0.7 * Math.pow(y/range, 2));

	var latest = null;

	for (var i in offsets) {
	if (offsets.hasOwnProperty(i)) {
	var offset = offsets[i];
	if (offset.top < y) latest = offset;
	}
	}

	if (latest && (!current \|\| (latest.index !== current.index))) {
	callback.call($sections,
	latest ? latest.id : null,
	current ? current.id : null,
	latest ? latest.el : null,
	current ? current.el : null);
	current = latest;
	}
	});

	$(window).trigger('resize');
	$parent.trigger('scroll');

	return this;
	};

	})(jQuery);