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Feature for dynamic spacing #202

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Feature for dynamic spacing #202

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16 changes: 9 additions & 7 deletions jquery.sticky.js
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,9 @@
for (var i = 0, l = sticked.length; i < l; i++) {
var s = sticked[i],
elementTop = s.stickyWrapper.offset().top,
etse = elementTop - s.topSpacing - extra;
topSpacing = typeof s.topSpacing === 'function' ? s.topSpacing() : s.topSpacing,
bottomSpacing = typeof s.bottomSpacing === 'function' ? s.bottomSpacing() : s.bottomSpacing,
etse = elementTop - topSpacing - extra;

//update height in case of dynamic content
s.stickyWrapper.css('height', s.stickyElement.outerHeight());
Expand All @@ -68,11 +70,11 @@
}
else {
var newTop = documentHeight - s.stickyElement.outerHeight()
- s.topSpacing - s.bottomSpacing - scrollTop - extra;
- topSpacing - bottomSpacing - scrollTop - extra;
if (newTop < 0) {
newTop = newTop + s.topSpacing;
newTop = newTop + topSpacing;
} else {
newTop = s.topSpacing;
newTop = topSpacing;
}
if (s.currentTop !== newTop) {
var newWidth;
Expand All @@ -98,10 +100,10 @@
s.stickyElement.trigger('sticky-update', [s]);
}

if (s.currentTop === s.topSpacing && s.currentTop > newTop || s.currentTop === null && newTop < s.topSpacing) {
if (s.currentTop === topSpacing && s.currentTop > newTop || s.currentTop === null && newTop < topSpacing) {
// just reached bottom || just started to stick but bottom is already reached
s.stickyElement.trigger('sticky-bottom-reached', [s]);
} else if(s.currentTop !== null && newTop === s.topSpacing && s.currentTop < newTop) {
} else if(s.currentTop !== null && newTop === topSpacing && s.currentTop < newTop) {
// sticky is started && sticked at topSpacing && overflowing from top just finished
s.stickyElement.trigger('sticky-bottom-unreached', [s]);
}
Expand All @@ -111,7 +113,7 @@

// Check if sticky has reached end of container and stop sticking
var stickyWrapperContainer = s.stickyWrapper.parent();
var unstick = (s.stickyElement.offset().top + s.stickyElement.outerHeight() >= stickyWrapperContainer.offset().top + stickyWrapperContainer.outerHeight()) && (s.stickyElement.offset().top <= s.topSpacing);
var unstick = (s.stickyElement.offset().top + s.stickyElement.outerHeight() >= stickyWrapperContainer.offset().top + stickyWrapperContainer.outerHeight()) && (s.stickyElement.offset().top <= topSpacing);

if( unstick ) {
s.stickyElement
Expand Down