Description
Lazy loading delays your image loading process on a given page. Lazy loading improves scrolling performance, speeds page load and save traffic.Lazy load elements and images must be inside of scrollable <div class="page-content"> to work properly.The below table demonstrates the use of lazy load:
| S.N. | 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 won't work and you need to use methods to initialize it. |
$$('img.lazy').trigger('lazy'); $$('div.lazy').trigger('lazy');
Example
The below 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's carry out the following steps to see how above code works:- Save above 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 output as below gets displayed.
- The example specifies the lazy load of images where images will get load on the page when you scroll them down.
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