Added option for extra offset, making it possible to trigger the cros…

…sfade before getting to the top of the target object. Reintroducing PR because previous PR had eliminated trailing whitespaces, making the diff hell to look at.
mikefowler · Apr 30, 2015 · 9858919 · 9858919
1 parent 1e3d98b
commit 9858919
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Showing 2 changed files with 4 additions and 3 deletions.
diff --git a/dist/crossfade.jquery.js b/dist/crossfade.jquery.js
diff --git a/src/crossfade.jquery.js b/src/crossfade.jquery.js
@@ -251,7 +251,7 @@
 	Crossfade.prototype.onScroll = function () {
 
 		var scrollTop = $(window).scrollTop();
-    var elementOffsetTop = this.el.offset().top;
+    var elementOffsetTop = this.el.offset().top - this.options.offset;
     var elementHeight = this.el.height();
     var percentage;
 
@@ -349,7 +349,8 @@
 
 	$.fn.crossfade.defaults = {
 		backgroundPosition: 'center center',
-		threshold: 0.5
+		threshold: 0.5,
+		offset: 0
 	};
 
 	// --------------------------------------------------------------------------