How to Create Fading Layers in Storyline

Sometimes when I am poking around inside published courses trying to solve one puzzle a crazy idea will come into my head. This was one of those. I am not certain this particular code will be immediately useful to you, but hopefully it will spark a crazy idea in your head!

While trying to solve an issue with Storyline I recently noticed that the entire contents of each slide’s layers are in a single DIV element. This lets us easily target all the contents of a layer with our JavaScript.

To illustrate this I wrote this code to grab the first layer and set its opacity to 50%:

$(".slide-layer:eq(1)").css("opacity", 50);

So let’s take a moment to digest that.

I am using jQuery to find all the DOM elements with the slide-layer class. That would return an array of all the layers and I am only interested in the first one, so I add that eq(1). Then I set its CSS opacity to 50%. All in one line of code :-)

To make things more fun I decided to build a demo that uses a Storyline Slider to allow you to control the opacity yourself.

You can play with that demo here:

View Demo

Here is the code I used for that:

var o = GetPlayer().GetVar("layer_opacity_cow");

$(".slide-layer:eq(1)").css("opacity", o/100);

First, I get the value of the slider. Then, I set the layer’s opacity to that value.

Watch the short video below to see how it easy it was to build that.


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kingsleyJames Kingsley has worked in the eLearning Industry for over 16 years. He has won several awards for combining technologies to produce better eLearning. James is a Solver of Complex eLearning Puzzles, Founder of, and the Co-Founder of You can follow him on Twitter or connect with him on LinkedIn for additional tips and examples.