Hide/unhide navigation buttons - angularjs

In my AngularJS application I am using a panel that is divided into the header, the body and the footer. The start page contains a few buttons that lead to subsequent pages. In the footer I would like to have a "back button" on the left side and a "next button" on the right side that lead to the next/previous page. How can I achive that the buttons are only displayed where they make sense? Example: Buttons are not shown on the start page, a selection is made and a differnt page is loaded, the "back button" should be displayed in the footer. "Back button" is clicked, application goes back to the previous page (the main screen) and the "back button" is hidden.

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this is the link
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I have a slideshow of 12 images in place. When I click on the first image, the right arrow pops up which allows me to scroll to the next image. When I do so, the second image has no next button. The same is true for every picture except the first. The really odd thing is that when I hit the X button to close out, it scrolls to the next image. The previous button works correctly on all of the pictures, but there's something wrong with both the next button and the close(X) button
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