Skip to content
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

added option for delay #80

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

added option for delay #80

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
75 changes: 42 additions & 33 deletions jquery.unveil.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -10,47 +10,56 @@

;(function($) {

$.fn.unveil = function(threshold, callback) {
$.fn.unveil = function(threshold, definedDelay, callback) {

var $w = $(window),
th = threshold || 0,
retina = window.devicePixelRatio > 1,
attrib = retina? "data-src-retina" : "data-src",
images = this,
loaded;
var $w = $(window),
th = threshold || 0,
retina = window.devicePixelRatio > 1,
attrib = retina? "data-src-retina" : "data-src",
images = this,
delay = definedDelay || 0,
lastScroll = (new Date()).getTime(),
loaded;

this.one("unveil", function() {
var source = this.getAttribute(attrib);
source = source || this.getAttribute("data-src");
if (source) {
this.setAttribute("src", source);
if (typeof callback === "function") callback.call(this);
}
});
this.one("unveil", function() {
var source = this.getAttribute(attrib);
source = source || this.getAttribute("data-src");
if (source) {
this.setAttribute("src", source);
if (typeof callback === "function") callback.call(this);
}
});

function unveil() {
var inview = images.filter(function() {
var $e = $(this);
if ($e.is(":hidden")) return;
function unveil() {
if(((new Date()).getTime() - lastScroll) < delay)
return; // do not process if the page has scrolled again since last time

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

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

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

$w.on("scroll.unveil resize.unveil lookup.unveil", unveil);
$w.on("scroll.unveil resize.unveil lookup.unveil", function () {
lastScroll = (new Date()).getTime();
setTimeout(unveil, delay);
});

unveil();
setTimeout(unveil, delay);

return this;

};
return this;
};

})(window.jQuery || window.Zepto);