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add support for scrolling the sticky element if its higher from window #289

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add support for scrolling the sticky element if its higher from window #289

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32 changes: 31 additions & 1 deletion jquery.sticky.js
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Original file line number Diff line number Diff line change
Expand Up @@ -34,12 +34,15 @@
getWidthFrom: '',
widthFromWrapper: true, // works only when .getWidthFrom is empty
responsiveWidth: false,
zIndex: 'inherit'
zIndex: 'inherit',
scrollStickyElement: false
},
$window = $(window),
$document = $(document),
sticked = [],
windowHeight = $window.height(),
lastScroll = $window.scrollTop(),
stickyOffest = 0,
scroller = function() {
var scrollTop = $window.scrollTop(),
documentHeight = $document.height(),
Expand Down Expand Up @@ -76,6 +79,33 @@
} else {
newTop = s.topSpacing;
}

if (s.scrollStickyElement) {
//also scroll the sticky element if its higher from window
if (s.stickyElement.outerHeight() > windowHeight) {
var scrollDiff = scrollTop - lastScroll;
var newStickyOffest = stickyOffest - scrollDiff;

if (scrollDiff > 0) {
//down
if ((s.stickyElement.outerHeight() + stickyOffest) > windowHeight) {
stickyOffest = newStickyOffest;
if (stickyOffest < (windowHeight - s.stickyElement.outerHeight())) {
stickyOffest = windowHeight - s.stickyElement.outerHeight();
}
}
newTop = stickyOffest;
} else if (s.currentTop < 0) {
//up
newTop = stickyOffest = newStickyOffest;
} else {
newTop = 0;
}
}
}

lastScroll = scrollTop;

if (s.currentTop !== newTop) {
var newWidth;
if (s.getWidthFrom) {
Expand Down