Merge pull request #1307 from tomaszdurka/issue-1307

BREAKING: Add jquery event scrollTop

client-vendor/after-body/jquery.event.scrollTopBottom/jquery.event.scrollTopBottom.js

@@ -0,0 +1,56 @@
+/*
+ * Author: CM
+ */
+(function($) {
+  var checkDelay = 100;
+  var preloadMultiple = 3;
+
+  var checkScrollTop = _.throttle(function(event) {
+    event.type = 'scrollTop';
+    var $this = $(this);
+    var innerHeight = $this.innerHeight();
+    var distanceFromTop = $this.scrollTop();
+    var distanceMin = innerHeight * preloadMultiple;
+    if (distanceFromTop < distanceMin) {
+      $(this).trigger('scrollTop', [event]);
+      return true;
+    }
+    return false;
+  }, checkDelay);
+
+  $.event.special.scrollTop = {
+    add: function(handleObj) {
+      jQuery.event.add(this, 'scroll', checkScrollTop);
+      jQuery.event.add(this, 'touchmove', checkScrollTop);
+    },
+    remove: function(handleObj) {
+      jQuery.event.remove(this, 'scroll', checkScrollTop);
+      jQuery.event.remove(this, 'touchmove', checkScrollTop);
+    }
+  };
+
+  var checkScrollBottom = _.throttle(function(event) {
+    event.type = 'scrollBottom';
+    var $this = $(this);
+    var scrollHeight = $this.is($(window)) ? $('body').prop('scrollHeight') : $this.prop('scrollHeight');
+    var innerHeight = $this.innerHeight();
+    var distanceFromBottom = scrollHeight - innerHeight - $this.scrollTop();
+    var distanceMin = innerHeight * preloadMultiple;
+    if (distanceFromBottom < distanceMin) {
+      $(this).trigger('scrollBottom', [event]);
+      return true;
+    }
+    return false;
+  }, checkDelay);
+
+  $.event.special.scrollBottom = {
+    add: function(handleObj) {
+      jQuery.event.add(this, 'scroll', checkScrollBottom);
+      jQuery.event.add(this, 'touchmove', checkScrollBottom);
+    },
+    remove: function(handleObj) {
+      jQuery.event.remove(this, 'scroll', checkScrollBottom);
+      jQuery.event.remove(this, 'touchmove', checkScrollBottom);
+    }
+  };
+})(jQuery);