window.location.protocol will return
file: for app-based readers, and it will return
http: for browser-based readers. Using this, we can make a function to switch a div on or off based on the value of
Consider the following HTML snippet:
This very basic example loads the page and then fires the switching function at the end, so that it can “see” the two divs and therefore hide the appropriate one. If the reader is using an app, then
file: and the div called “webMessage” gets switched off. In order for it to work for you, you will need to provide two images to replace my
monkey.png. Put them in a folder along with an html file containing the snippet, make a Web Content overlay, and point it at the html file. Be sure to set it to auto play, and depending on the content of the divs, you might want to turn off “Allow User Interaction.”
The example also includes fonts to match the InDesign layout. In the App, I use the HTMLResources folder, about which you can learn more about in the help file for Hyperlinks. In the browser, I use fonts from Typekit, which is a web-based font service from Adobe that’s part of Creative Cloud Membership. You could also use Adobe Edge Web Fonts or other hosted web font services.
Now, to test how this works, you need to make a folio, add your InDesign file as an article, publish the folio into an app that has Web Renditions enabled and Social Sharing turned on in the Viewer. Notice the publish the folio instruction. In order to see the folio in a browser, you need to publish to a Viewer App and then socially share the article. Since Single Edition can’t use social sharing, this will only apply to customers who use Pro or Enterprise. In addition, in order to test whether this works, you will need access to a DPS Application account that has Web Renditions enabled and a Viewer App that has Social Sharing turned on. Once you’ve published, open the folio, browse to your app, and then share it by email with yourself to test.
Here is how the folio renders on an iPad:
…and in a browser:
The ease with which we can distinguish between readers in a browser and readers in an app allows publishers to provide content that can target users based on how they engage with that content, as well as to offer differentiated advertising. It also allows you to take advantage of browser features that won’t work on a tablet due to the limitations of the WebKit overlay, simply by making two versions of the HTML and switching on the appropriate div. Sometimes, simple solutions open up complex possibilities, and this is one of those solutions.