/home/edulekha/acepackagingindustry.com/wp-content/plugins/lazy-load/lazy-load.php
<?php
/**
* Plugin Name: Lazy Load
* Description: Lazy load images to improve page load times. Uses jQuery.sonar to only load an image when it's visible in the viewport.
* Version: 0.6
* Text Domain: lazy-load
*
* Code by the WordPress.com VIP team, TechCrunch 2011 Redesign team, and Jake Goldman (10up LLC).
* Uses jQuery.sonar by Dave Artz (AOL): http://www.artzstudio.com/files/jquery-boston-2010/jquery.sonar/
*
* License: GPL2
*/
if ( ! class_exists( 'LazyLoad_Images' ) ) :
class LazyLoad_Images {
const version = '0.6';
protected static $enabled = true;
static function init() {
if ( is_admin() )
return;
if ( ! apply_filters( 'lazyload_is_enabled', true ) ) {
self::$enabled = false;
return;
}
add_action( 'wp_enqueue_scripts', array( __CLASS__, 'add_scripts' ) );
add_action( 'wp_head', array( __CLASS__, 'setup_filters' ), 9999 ); // we don't really want to modify anything in <head> since it's mostly all metadata, e.g. OG tags
}
static function setup_filters() {
add_filter( 'the_content', array( __CLASS__, 'add_image_placeholders' ), 99 ); // run this later, so other content filters have run, including image_add_wh on WP.com
add_filter( 'post_thumbnail_html', array( __CLASS__, 'add_image_placeholders' ), 11 );
add_filter( 'get_avatar', array( __CLASS__, 'add_image_placeholders' ), 11 );
}
static function add_scripts() {
wp_enqueue_script( 'wpcom-lazy-load-images', self::get_url( 'js/lazy-load.js' ), array( 'jquery', 'jquery-sonar' ), self::version, true );
wp_enqueue_script( 'jquery-sonar', self::get_url( 'js/jquery.sonar.min.js' ), array( 'jquery' ), self::version, true );
}
static function add_image_placeholders( $content ) {
if ( ! self::is_enabled() )
return $content;
// Don't lazyload for feeds, previews, mobile
if( is_feed() || is_preview() )
return $content;
// Don't lazy-load if the content has already been run through previously
if ( false !== strpos( $content, 'data-lazy-src' ) )
return $content;
// In case you want to change the placeholder image
$placeholder_image = apply_filters( 'lazyload_images_placeholder_image', self::get_url( 'images/1x1.trans.gif' ) );
// This is a pretty simple regex, but it works
$content = preg_replace( '#<img([^>]+?)src=[\'"]?([^\'"\s>]+)[\'"]?([^>]*)>#', sprintf( '<img${1}src="%s" data-lazy-src="${2}"${3}><noscript><img${1}src="${2}"${3}></noscript>', $placeholder_image ), $content );
return $content;
}
static function is_enabled() {
return self::$enabled;
}
static function get_url( $path = '' ) {
return plugins_url( ltrim( $path, '/' ), __FILE__ );
}
}
function lazyload_images_add_placeholders( $content ) {
return LazyLoad_Images::add_image_placeholders( $content );
}
add_action( 'init', array( 'LazyLoad_Images', 'init' ) );
endif;