JQuery Mobile Detect Home Screen Bookmark
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You can ask the user to bookmark your app and then save their response ( here on Mobile Coax ). This will allow you to "detect" if they have already added it.
The Mobile Bookmark Bubble is a JavaScript library that adds a promo bubble at the bottom of your mobile web app, inviting users to close the app from the home screen of the device. The library uses HTML5 local storage to keep track of whether a promo has already been displayed to avoid constant user manipulation.
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