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Added debouncing for scroll event #93

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Added debouncing for scroll event #93

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41 changes: 26 additions & 15 deletions jquery.unveil.js
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,8 @@
retina = window.devicePixelRatio > 1,
attrib = retina? "data-src-retina" : "data-src",
images = this,
loaded;
loaded,
timer;

this.one("unveil", function() {
var source = this.getAttribute(attrib);
Expand All @@ -29,20 +30,30 @@
});

function unveil() {
var inview = images.filter(function() {
var $e = $(this);
if ($e.is(":hidden")) return;

var wt = $w.scrollTop(),
wb = wt + $w.height(),
et = $e.offset().top,
eb = et + $e.height();

return eb >= wt - th && et <= wb + th;
});

loaded = inview.trigger("unveil");
images = images.not(loaded);
if (timer) {
window.clearTimeout(timer);
}

timer = window.setTimeout(function() {
// there were no more images on the entire page
// no need to keep trying
if (images.length == 0) return;

var inview = images.filter(function() {
var $e = $(this);
if ($e.is(":hidden")) return;

var wt = $w.scrollTop(),
wb = wt + $w.height(),
et = $e.offset().top,
eb = et + $e.height();

return eb >= wt - th && et <= wb + th;
});

loaded = inview.trigger("unveil");
images = images.not(loaded);
}, 50);
}

$w.on("scroll.unveil resize.unveil lookup.unveil", unveil);
Expand Down