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Added ability to specify a scrollable parent object #22

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Added ability to specify a scrollable parent object #22

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a6c85c7
Added ability to specify a scrollable parent object
Sep 5, 2013
fa13b15
fixed for scrollable parent object
andysmithdev Oct 29, 2013
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28 changes: 17 additions & 11 deletions jquery.appear.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,13 +13,15 @@

var check_binded = false;
var check_lock = false;
var $window = $(window);
var defaults = {
interval: 250,
force_process: false
force_process: false,
scrolling_parent: $window
}
var $window = $(window);

var $prior_appeared;
var scrolling_parent;

function process() {
check_lock = false;
Expand All @@ -45,16 +47,15 @@
return false;
}

var window_left = $window.scrollLeft();
var window_top = $window.scrollTop();
var offset = $element.offset();
var left = offset.left;
var top = offset.top;
// calculate pos of element relative to the visible part of the scrolling_parent
var left = offset.left - scrolling_parent.offset().left;
var top = offset.top - scrolling_parent.offset().top;

if (top + $element.height() >= window_top &&
top - ($element.data('appear-top-offset') || 0) <= window_top + $window.height() &&
left + $element.width() >= window_left &&
left - ($element.data('appear-left-offset') || 0) <= window_left + $window.width()) {
if ((top + $element.height() >= 0) &&
(top - ($element.data('appear-top-offset') || 0) <= scrolling_parent.height()) &&
(left + $element.width() >= 0) &&
(left - ($element.data('appear-left-offset') || 0) <= scrolling_parent.width())) {
return true;
} else {
return false;
Expand All @@ -76,7 +77,12 @@
setTimeout(process, opts.interval);
};

$(window).scroll(on_check).resize(on_check);
scrolling_parent = opts.scrolling_parent;
scrolling_parent.scroll(on_check);
// resize event is only triggered for $window so no point setting it on scrolling_parent
// if scrolling_parent is resizeable you should make sure your resizing code calls .resize()
$window.resize(on_check);

check_binded = true;
}

Expand Down