Kode yang mereka gunakan, mereka sebut dengan nama Lazy Load Image Plug-in. Ternyata kode ini sudah lulus tes di beberapa aplikasi seperti Safari 5.1, Safari 6, Chrome 20, Firefox 12 pada OSX dan Chrome 20, IE 8, IE 9 di Windows, Safari 5.1 pada iOS 5 untuk iPhone dan iPad.
Lazy Load Image Plug-in dapat meningkatkan kinerja gambar yang berupa :
- Gambar Posting
- Thumbnail Posting
- Gravatar gambar
- Konten iframe
Cara memasang Lazy Load Image Plug-in di blog
- Login ke blogger → Klik Template → Pilih Edit HTML
- Letakkan kode berikut di atas kode </head>
<script type='text/javascript'>
//<;
self.loaded = true;
/* Remove image from array so it is not looped next time. */
var temp = $.grep(elements, function(element) {
return !element.loaded;
});
elements = $(temp);
if (settings.load) {
var elements_left = elements.length;
settings.load.call(self, elements_left, settings);
}
})
.attr("src", $self.data(settings.data_attribute));
}
});
/* When wanted event is triggered load original image */
/* by triggering appear. */
if (0 !== settings.event.indexOf("scroll")) {
$self.bind(settings.event, function(event) {
if (!self.loaded) {
$self.trigger("appear");
}
});
}
});
/* Check if something appears when window is resized. */
$window.bind("resize", function(event) {
update();
});
/* With IOS5 force loading images when navigating with back button. */
/* Non optimal workaround. */
if ((/iphone|ipod|ipad.*os 5/gi).test(navigator.appVersion)) {
$window.bind("pageshow", function(event) {
if (event.originalEvent.persisted) {
elements.each(function() {
$(this).trigger("appear");
});
}
});
}
/* Force initial check if images should appear. */
$(window).load(function() {
update();
});
return this;
};
/* Convenience methods in jQuery namespace. */
/* Use as $.belowthefold(element, {threshold : 100, container : window}) */
$.belowthefold = function(element, settings) {
var fold;
if (settings.container === undefined || settings.container === window) {
fold = $window.height() + $window.scrollTop();
} else {
fold = $(settings.container).offset().top + $(settings.container).height();
}
return fold <= $(element).offset().top - settings.threshold;
};
$.rightoffold = function(element, settings) {
var fold;
if (settings.container === undefined || settings.container === window) {
fold = $window.width() + $window.scrollLeft();
} else {
fold = $(settings.container).offset().left + $(settings.container).width();
}
return fold <= $(element).offset().left - settings.threshold;
};
$.abovethetop = function(element, settings) {
var fold;
if (settings.container === undefined || settings.container === window) {
fold = $window.scrollTop();
} else {
fold = $(settings.container).offset().top;
}
return fold >= $(element).offset().top + settings.threshold + $(element).height();
};
$.leftofbegin = function(element, settings) {
var fold;
if (settings.container === undefined || settings.container === window) {
fold = $window.scrollLeft();
} else {
fold = $(settings.container).offset().left;
}
return fold >= $(element).offset().left + settings.threshold + $(element).width();
};
$.inviewport = function(element, settings) {
return !$.rightoffold(element, settings) && !$.leftofbegin(element, settings) &&
!$.belowthefold(element, settings) && !$.abovethetop(element, settings);
};
/* Custom selectors for your convenience. */
/* Use as $("img:below-the-fold").something() or */
/* $("img").filter(":below-the-fold").something() which is faster */
$.extend($.expr[':'], {
"below-the-fold" : function(a) { return $.belowthefold(a, {threshold : 0}); },
"above-the-top" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
"right-of-screen": function(a) { return $.rightoffold(a, {threshold : 0}); },
"left-of-screen" : function(a) { return !$.rightoffold(a, {threshold : 0}); },
"in-viewport" : function(a) { return $.inviewport(a, {threshold : 0}); },
/* Maintain BC for couple of versions. */
"above-the-fold" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
"right-of-fold" : function(a) { return $.rightoffold(a, {threshold : 0}); },
"left-of-fold" : function(a) { return !$.rightoffold(a, {threshold : 0}); }
});
//]]>
</script>
<script charset='utf-8' type='text/javascript'>
$(function() {
$("img").lazyload({placeholder : "https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjV3mRL8H8N4N7AdlAJ8jXC0FQoLRXS18BBkP0uwQGBqdCoJiLwyVtkPCCUHUo_gGc45siFhjSCq-qXhnKUtIGcXkjkFP_gaaLLVV5X8dFeEBv0kIMtKjEUoK7oA0fibiBHsI_SiHdKDzg/s1600/grey.gif",threshold : 200});
});
</script>
- Simpan template
Untuk menguji Lazy Load Image Plug-in ini, silahkan memasukkan beberapa gambar besar di postingan sobat. Perhatikan dengan teliti kecepatan blog anda SEBELUM dan SETELAH di tambahkan Lazy Load Image Plug-in. Untuk mengecek kecepatan loading blog, silahkan mamfaatkan layanan gratis Google Site Speed.
