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Description
Lazy loading delays your image loading process on a given page. Lazy loading improves scrolling performance, speeds page load and saves traffic.
Lazy load elements and images must be inside of scrollable <div class = “page-content”> to work properly.
The following table demonstrates the use of lazy load −
| S.No | Lazy load usage & Description |
|---|---|
| 1 | Usage
The lazy load can be applied to images, background images and with fade-in effect. |
| 2 | Init Lazy Load Manually
After initializing a page, if you add lazy load images manually then, lazy load will not work and you need to use methods to initialize it. |
It is possible to trigger image loading manually by using lazy event on lazy image/element as shown below −
$$(''img.lazy'').trigger(''lazy'');
$$(''div.lazy'').trigger(''lazy'');
Example
The following example demonstrates the use of lazy loading in Framework7 −
<!DOCTYPE html>
<html class = "with-statusbar-overlay">
<head>
<meta name = "viewport" content = "width = device-width, initial-scale = 1,
maximum-scale = 1, minimum-scale = 1, user-scalable = no, minimal-ui" />
<meta name = "apple-mobile-web-app-capable" content = "yes" />
<meta name = "apple-mobile-web-app-status-bar-style" content = "black" />
<title>Lazy Load</title>
<link rel = "stylesheet"
href = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/css/framework7.ios.min.css" />
<link rel = "stylesheet"
href = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/css/framework7.ios.colors.min.css" />
</head>
<body>
<div class = "views">
<div class = "view view-main">
<div class = "pages">
<div data-page = "home" class = "page navbar-fixed">
<div class = "navbar">
<div class = "navbar-inner">
<div class = "left"> </div>
<div class = "center">Lazy Load</div>
<div class = "right"> </div>
</div>
</div>
<div class = "page-content">
<div class = "content-block">
<div class = "content-block-inner">
<p> <img data-src = "/framework7/images/pic4.jpg"
width = "100%" class = "lazy lazy-fadeIn"></p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur.</p>
<p> <img data-src = "/framework7/images/pic5.jpg"
width = "100%" class = "lazy lazy-fadeIn"></p>
<p>Sed ut perspiciatis unde omnis iste natus error sit
voluptatem accusantium doloremque laudantium, totam rem aperiam,
eaque ipsa quae ab illo inventore veritatis et quasi architecto
beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia
voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur
magni dolores eos qui ratione voluptatem sequi nesciunt.</p>
<p> <img data-src = "/framework7/images/background.jpg"
width = "100%" class = "lazy lazy-fadeIn"></p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur.</p>
<p> <img data-src = "/framework7/images/pic6.jpg"
width = "100%" class = "lazy lazy-fadeIn"></p>
<p>Sed ut perspiciatis unde omnis iste natus error sit voluptatem
accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab
illo inventore veritatis et quasi architecto beatae vitae dicta sunt
explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut
odit aut fugit, sed quia consequuntur magni dolores eos qui ratione
voluptatem sequi nesciunt.</p>
<p> <img data-src = "/framework7/images/pic7.jpg"
width = "100%" class = "lazy lazy-fadeIn"></p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
pariatur.</p>
<p> <img data-src = "/framework7/images/pic8.jpg"
width = "100%" class = "lazy lazy-fadeIn"></p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Praesent laoreet nisl eget neque blandit lobortis. Sed sagittis risus
id vestibulum finibus. Cras vestibulum sem et massa hendrerit maximus.
Vestibulum suscipit tristique iaculis. Nam vitae risus non eros auctor
tincidunt quis vel nulla. Sed volutpat, libero ac blandit vehicula, est
sem gravida lectus, sed imperdiet sapien risus ut neque.</p>
<p><b>Using as background image:</b></p>
<div data-background = "/framework7/images/pic7.jpg"
style = "background: #aaa; height:60vw; background-size-cover"
class = "lazy lazy-fadeIn">
</div>
<p>Sed ut perspiciatis unde omnis iste natus error sit voluptatem
accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab
illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo.
Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit,
sed quia consequuntur magni dolores eos qui ratione voluptatem sequi
nesciunt.</p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/js/framework7.min.js"></script>
<script>var myApp = new Framework7();</script>
</body>
</html>
Output
Let us carry out the following steps to see how the above given code works −
-
Save the above given HTML code as framework7_lazy_load.html file in your server root folder.
-
Open this HTML file as http://localhost/framework7_lazy_load.html and the output is displayed as shown below.
-
The example specifies the lazy load of images where images will get loaded on the page when you scroll them down.
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