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(function ($) {
$.fn.pushpin = function (options) {
// Defaults
var defaults = {
top: 0,
bottom: Infinity,
offset: 0
};
// Remove pushpin event and classes
if (options === "remove") {
this.each(function () {
if (id = $(this).data('pushpin-id')) {
$(window).off('scroll.' + id);
$(this).removeData('pushpin-id').removeClass('pin-top pinned pin-bottom').removeAttr('style');
}
});
return false;
}
options = $.extend(defaults, options);
$index = 0;
return this.each(function() {
var $uniqueId = Materialize.guid(),
$this = $(this),
$original_offset = $(this).offset().top;
function removePinClasses(object) {
object.removeClass('pin-top');
object.removeClass('pinned');
object.removeClass('pin-bottom');
}
function updateElements(objects, scrolled) {
objects.each(function () {
// Add position fixed (because its between top and bottom)
if (options.top <= scrolled && options.bottom >= scrolled && !$(this).hasClass('pinned')) {
removePinClasses($(this));
$(this).css('top', options.offset);
$(this).addClass('pinned');
}
// Add pin-top (when scrolled position is above top)
if (scrolled < options.top && !$(this).hasClass('pin-top')) {
removePinClasses($(this));
$(this).css('top', 0);
$(this).addClass('pin-top');
}
// Add pin-bottom (when scrolled position is below bottom)
if (scrolled > options.bottom && !$(this).hasClass('pin-bottom')) {
removePinClasses($(this));
$(this).addClass('pin-bottom');
$(this).css('top', options.bottom - $original_offset);
}
});
}
$(this).data('pushpin-id', $uniqueId);
updateElements($this, $(window).scrollTop());
$(window).on('scroll.' + $uniqueId, function () {
var $scrolled = $(window).scrollTop() + options.offset;
updateElements($this, $scrolled);
});
});
};
}( jQuery ));
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