Template.imageControls.events({
    'change #imageSlider': function(e) {
        // Using the slider in an inactive viewport
        // should cause that viewport to become active
        var slider = $(e.currentTarget);
        var newActiveElement = slider.parents().eq(2).siblings('.imageViewerViewport').get(0);
        setActiveViewport(newActiveElement);

        // Subtract 1 here since the slider goes from 1 to N images
        // But the stack indexing starts at 0
        var newImageIdIndex = parseInt(slider.val(), 10) - 1;
        switchToImageByIndex(newImageIdIndex);
    }
});