<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<style type="text/css">
.test div{ width: 500px;height: 500px;}
#aa{ height: auto;}
</style>
<script src="Scripts/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
(function ($, window) {
var $window = $(window);
$.fn.lazyevent = function (options) {
var elements = this;
var settings = {
threshold: 0,
event: "scroll",
container: window,
skip_invisible: true,
fn: null,
data: null
};
function update() {
elements.each(function () {
var $this = $(this);
if (settings.skip_invisible && !$this.is(":visible")) {
return;
}
if (inviewport(this, settings)) {
$this.trigger("fire");
}
}); }
if (options) {
$.extend(settings, options);
}
var $container = (settings.container === undefined || settings.container === window) ? $window : $(settings.container); if (0 === settings.event.indexOf("scroll")) {
$container.bind(settings.event, function (event) { return update(); });
}
this.each(function () {
var self = this;
var $self = $(self);
self.fired = false;
$self.one("fire", function () {
if (!this.fired) {
if (settings.fn) {
settings.fn.call(self, settings.data);
}
self.fired = true;
var temp = $.grep(elements, function (element) { return !element.fired; });
elements = $(temp);
}
}); if (0 !== settings.event.indexOf("scroll")) {
$self.bind(settings.event, function (event) {
if (!self.fired) {
$self.trigger("fire");
}
});
}
}); $window.bind("resize", function (event) {
update();
}); var belowthefold = function (element, settings) {
var fold; if (settings.container === undefined || settings.container === window) {
fold = $window.height() + $window.scrollTop();
} else {
fold = $container.offset().top + $container.height();
}
return fold <= $(element).offset().top - settings.threshold;
}; var rightoffold = function (element, settings) {
var fold; if (settings.container === undefined || settings.container === window) {
fold = $window.width() + $window.scrollLeft();
} else {
fold = $container.offset().left + $container.width();
} return fold <= $(element).offset().left - settings.threshold;
};
var abovethetop = function (element, settings) {
var fold; if (settings.container === undefined || settings.container === window) {
fold = $window.scrollTop();
} else {
fold = $container.offset().top;
} return fold >= $(element).offset().top + settings.threshold + $(element).height();
}; var leftofbegin = function (element, settings) {
var fold; if (settings.container === undefined || settings.container === window) {
fold = $window.scrollLeft();
} else {
fold = $container.offset().left;
} return fold >= $(element).offset().left + settings.threshold + $(element).width();
};
var inviewport = function (element, settings) {
return !abovethetop(element, settings) && !leftofbegin(element, settings) &&
!belowthefold(element, settings) && !rightoffold(element, settings);
};
update();
return this;
}; })(jQuery, window);
</script>
<script type="text/javascript">
$(function () {
$("#aa").lazyevent({
data: "hello word",
fn: function (data) {
var html = $(this).html();
alert(data + ":" + html);
}
});
});
</script> </head>
<body>
<div style="height: 200px">
</div>
<div class="test">
<div style="background-color: Green" >Green</div>
<div style="background-color: Lime">Lime</div>
<div style="background-color: Maroon; display:none">Maroon</div>
<div style="background-color: Olive">Olive</div>
<div style="background-color: Red; display: none">Red</div>
<div style="background-color: ButtonFace">ButtonFace</div>
<div style="background-color: Aqua">Aqua</div>
<div style="background-color: AppWorkspace; height:auto;" id="aa" >AppWorkspace</div>
</div>
</body>
</html>
压缩后的js代码：
<script type="text/javascript">
(function (a, c) { var b = a(c); a.fn.lazyevent = function (j) { var g = this; var l = { threshold: 0, event: "scroll", container: c, skip_invisible: true, fn: null, data: null }; function m() { var n = 0; g.each(function () { var o = a(this); if (l.skip_invisible && !o.is(":visible")) { return } if (h(this, l)) { o.trigger("fire") } }) } if (j) { a.extend(l, j) } var d = (l.container === undefined || l.container === c) ? b : a(l.container); if (0 === l.event.indexOf("scroll")) { d.bind(l.event, function (n) { return m() }) } this.each(function () { var o = this; var n = a(o); o.fired = false; n.one("fire", function () { if (!this.fired) { if (l.fn) { l.fn.call(o, l.data) } o.fired = true; var p = a.grep(g, function (q) { return !q.fired }); g = a(p) } }); if (0 !== l.event.indexOf("scroll")) { n.bind(l.event, function (p) { if (!o.fired) { n.trigger("fire") } }) } }); b.bind("resize", function (n) { m() }); var f = function (n, p) { var o; if (p.container === undefined || p.container === c) { o = b.height() + b.scrollTop() } else { o = d.offset().top + d.height() } return o <= a(n).offset().top - p.threshold }; var k = function (n, p) { var o; if (p.container === undefined || p.container === c) { o = b.width() + b.scrollLeft() } else { o = d.offset().left + d.width() } return o <= a(n).offset().left - p.threshold }; var e = function (n, p) { var o; if (p.container === undefined || p.container === c) { o = b.scrollTop() } else { o = d.offset().top } return o >= a(n).offset().top + p.threshold + a(n).height() }; var i = function (n, p) { var o; if (p.container === undefined || p.container === c) { o = b.scrollLeft() } else { o = d.offset().left } return o >= a(n).offset().left + p.threshold + a(n).width() }; var h = function (n, o) { return !e(n, o) && !i(n, o) && !f(n, o) && !k(n, o) }; m(); return this } })(jQuery, window);
</script>