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Added custom scroll container and document to options #51

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Added custom scroll container and document to options #51

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16 changes: 9 additions & 7 deletions jquery.scrolldepth.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,9 @@
percentage: true,
userTiming: true,
pixelDepth: true,
nonInteraction: true
nonInteraction: true,
$scrollContainer: $(window),
$scrollDocument: $(document)
};

var $window = $(window),
Expand All @@ -35,7 +37,7 @@
options = $.extend({}, defaults, options);

// Return early if document height is too small
if ( $(document).height() < options.minHeight ) {
if (options.$scrollDocument.height() < options.minHeight) {
return;
}

Expand Down Expand Up @@ -222,15 +224,15 @@
* Scroll Event
*/

$window.on('scroll.scrollDepth', throttle(function() {
options.$scrollContainer.on('scroll.scrollDepth', throttle(function () {
/*
* We calculate document and window height on each scroll event to
* account for dynamic DOM changes.
*/

var docHeight = $(document).height(),
winHeight = window.innerHeight ? window.innerHeight : $window.height(),
scrollDistance = $window.scrollTop() + winHeight,
var docHeight = options.$scrollDocument.height(),
winHeight = options.$scrollContainer.height(),
scrollDistance = options.$scrollContainer.scrollTop() + winHeight,

// Recalculate percentage marks
marks = calculateMarks(docHeight),
Expand All @@ -240,7 +242,7 @@

// If all marks already hit, unbind scroll event
if (cache.length >= 4 + options.elements.length) {
$window.off('scroll.scrollDepth');
options.$scrollContainer.off('scroll.scrollDepth');
return;
}

Expand Down