Skip to content

Added debouncing for scroll event #93

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
aonic wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Added debouncing for scroll event #93

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
41 changes: 26 additions & 15 deletions jquery.unveil.js
View file
Open in desktop
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