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Allow scrollable viewports different from window #8

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Allow scrollable viewports different from window #8

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c80fc7b
Allow scrollable viewports different from window
elhoyos Feb 22, 2013
16fa6da
Adjust trigger point of scrollable viewports
elhoyos Feb 27, 2013
c96b0e3
Fixed calculations for elements visibility on viewports
elhoyos Dec 2, 2013
9559a53
Removed unused document reference
elhoyos Dec 2, 2013
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34 changes: 24 additions & 10 deletions jquery.appear.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,9 +15,11 @@
var check_lock = false;
var defaults = {
interval: 250,
force_process: false
force_process: false,
viewport: window
}
var $window = $(window);
var $viewport = $(defaults.viewport);

var $prior_appeared;

Expand Down Expand Up @@ -45,16 +47,26 @@
return false;
}

var window_left = $window.scrollLeft();
var window_top = $window.scrollTop();
var is_win = $viewport[0] === window;

var scroll_top = $viewport.scrollTop();
var scroll_left = $viewport.scrollLeft();

var viewport_offset = $viewport.offset();
var viewport_offset_top = is_win ? 0 : viewport_offset.top;
var viewport_offset_left = is_win ? 0 : viewport_offset.left;

var offset = $element.offset();
var left = offset.left;
var top = offset.top;
var top = is_win ? offset.top : Math.abs(viewport_offset_top - offset.top - scroll_top);
var left = is_win ? offset.left : Math.abs(viewport_offset_left - offset.left - scroll_left);

var extra_offset_top = $element.data('appear-top-offset') || 0;
var extra_offset_left = $element.data('appear-top-offset') || 0;

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() >= scroll_top &&
top - extra_offset_top <= scroll_top + $viewport.height() &&
left + $element.width() >= scroll_left &&
left - extra_offset_left <= scroll_left + $viewport.width()) {
return true;
} else {
return false;
Expand All @@ -76,7 +88,9 @@
setTimeout(process, opts.interval);
};

$(window).scroll(on_check).resize(on_check);
$viewport = $(opts.viewport);
$viewport.scroll(on_check);
$window.resize(on_check);
check_binded = true;
}

Expand Down