First release

.gitignore

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+/vendor
+/tests
+/.idea
+composer.phar
+composer.lock

composer.json

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+{
+  "name": "gevman/yii2-lazyload",
+  "description": "Yii2 Lazy load Widget for html blocks",
+  "type": "library",
+  "license": "MIT",
+  "keywords": [
+    "Yii2",
+    "Yii-Widget",
+    "Lazy Load",
+    "Lazyload",
+    "Block Lazy Load",
+    "Composer"
+  ],
+  "authors": [
+    {
+      "name": "Gevorg Mansuryan",
+      "email": "[email protected]"
+    }
+  ],
+  "require": {
+    "yiisoft/yii2": "~2.0.5"
+  },
+  "autoload": {
+    "psr-4": {
+      "Gevman\\LazyLoad\\": "src/"
+    }
+  }
+}

license.md

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+
+
+MIT License
+
+Copyright (c) 2017 Gevorg Mansuryan [email protected]
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

readme.md

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+# Yii2 Lazy load Widget for html blocks
+
+
+## Installation (using composer)
+
+```bash
+composer require gevman/yii2-lazyload
+```
+
+
+##### Example
+
+```php
+<?php \Gevman\LazyLoad\LazyBlock::begin([
+    'effect' => \Gevman\LazyLoad\LazyBlock::EFFECT_ZOOM_IN,
+    'speed' => 600, //default = 600 (time in miliseconds)
+    'delay' => 10 //default = 0 (time in miliseconds)
+]); ?>
+
+<div class="container">
+    <div class="row">
+        <div class="col-md-4">
+            <p><?=\yii\helpers\Html::encode($page->content)?></p>
+        </div>
+        <div class="col-md-4">
+            <p><?=\yii\helpers\Html::encode($page->content)?></p>
+        </div>
+        <div class="col-md-4">
+            <p><?=\yii\helpers\Html::encode($page->content)?></p>
+        </div>
+    </div>
+</div>
+
+<?php \Gevman\LazyLoad\LazyBlock::end(); ?>
+```
+
+##### Effects
+
+- EFFECT_SLIDE_UP
+- EFFECT_SLIDE_DOWN
+- EFFECT_SLIDE_FROM_LEFT
+- EFFECT_SLIDE_FROM_RIGHT
+- EFFECT_ZOOM_IN
+- EFFECT_ZOOM_OUT
+- EFFECT_ROTATE
+- EFFECT_SKEW

src/LazyBlock.php

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+<?php
+
+namespace Gevman\LazyLoad;
+
+use Gevman\LazyLoad\assets\LazyAsset;
+use yii\base\Widget;
+use yii\helpers\Html;
+
+class LazyBlock extends Widget
+{
+    const EFFECT_SLIDE_UP = 'effect-slideup';
+    const EFFECT_SLIDE_DOWN = 'effect-slidedown';
+    const EFFECT_SLIDE_FROM_LEFT = 'effect-slidefromleft';
+    const EFFECT_SLIDE_FROM_RIGHT = 'effect-slidefromright';
+    const EFFECT_ZOOM_IN = 'effect-zoomin';
+    const EFFECT_ZOOM_OUT = 'effect-zoomout';
+    const EFFECT_ROTATE = 'effect-rotate';
+    const EFFECT_SKEW = 'effect-skew';
+
+    public $effect = self::EFFECT_SLIDE_UP;
+    public $delay = 0;
+    public $speed = 600;
+
+    public function init()
+    {
+        parent::init();
+        $this->view->registerAssetBundle(LazyAsset::class);
+        ob_start();
+    }
+
+    public function run()
+    {
+        $content = ob_get_clean();
+        return Html::tag('div', $content, [
+            'id' => $this->id,
+            'class' => [
+                'lazy-load-box',
+                'trigger',
+                $this->effect
+            ],
+            'style' => [
+                '-webkit-transition' => "all {$this->speed}ms ease",
+                '-moz-transition' => "all {$this->speed}ms ease",
+                '-ms-transition' => "all {$this->speed}ms ease",
+                '-o-transition' => "all {$this->speed}ms ease",
+                'transition' => "all {$this->speed}ms ease",
+            ],
+            'data' => [
+                'delay' => $this->delay,
+                'speed' => $this->speed
+            ]
+        ]);
+    }
+}

src/assets/LazyAsset.php

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+<?php
+
+namespace Gevman\LazyLoad\assets;
+
+use yii\web\AssetBundle;
+use yii\web\JqueryAsset;
+
+class LazyAsset extends AssetBundle
+{
+    public $sourcePath = __DIR__.'/dist';
+
+    public $js = [
+        'js/device.min.js',
+        'js/gevman-lazyload.js',
+    ];
+
+    public $publishOptions = [
+        'forceCopy' => true,
+    ];
+
+    public $css = [
+        'css/gevman-lazyload.css'
+    ];
+
+    public $depends = [
+        JqueryAsset::class
+    ];
+}

src/assets/dist/css/gevman-lazyload.css

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+.lazy-load-box {
+    opacity: 1;
+    -moz-transform: scale(1) rotate(0deg) translateX(0px) translateY(0px) skewX(0deg) skewY(0deg);
+    -webkit-transform: scale(1) rotate(0deg) translateX(0px) translateY(0px) skewX(0deg) skewY(0deg);
+    -o-transform: scale(1) rotate(0deg) translateX(0px) translateY(0px) skewX(0deg) skewY(0deg);
+    -ms-transform: scale(1) rotate(0deg) translateX(0px) translateY(0px) skewX(0deg) skewY(0deg);
+    transform: scale(1) rotate(0deg) translateX(0px) translateY(0px) skewX(0deg) skewY(0deg);
+}
+
+.trigger.lazy-load-box {
+    opacity: 0;
+}
+
+/* Effects */
+.trigger.effect-slideup {
+    -moz-transform: translateY(100px);
+    -webkit-transform: translateY(100px);
+    -o-transform: translateY(100px);
+    -ms-transform: translateY(100px);
+    transform: translateY(100px);
+}
+
+.trigger.effect-slidedown {
+    -moz-transform: translateY(-50px);
+    -webkit-transform: translateY(-50px);
+    -o-transform: translateY(-50px);
+    -ms-transform: translateY(-50px);
+    transform: translateY(-50px);
+}
+
+.trigger.effect-slidefromleft {
+    -moz-transform: translateX(-150px);
+    -webkit-transform: translateX(-150px);
+    -o-transform: translateX(-150px);
+    -ms-transform: translateX(-150px);
+    transform: translateX(-150px);
+}
+
+.trigger.effect-slidefromright {
+    -moz-transform: translateX(150px);
+    -webkit-transform: translateX(150px);
+    -o-transform: translateX(150px);
+    -ms-transform: translateX(150px);
+    transform: translateX(150px);
+}
+
+.trigger.effect-zoomin {
+    -moz-transform: scale(0.5);
+    -webkit-transform: scale(0.5);
+    -o-transform: scale(0.5);
+    -ms-transform: scale(0.5);
+    transform: scale(0.5);
+}
+
+.trigger.effect-zoomout {
+    -moz-transform: scale(1.5);
+    -webkit-transform: scale(1.5);
+    -o-transform: scale(1.5);
+    -ms-transform: scale(1.5);
+    transform: scale(1.5);
+}
+
+.trigger.effect-rotate {
+    -moz-transform: rotate(45deg);
+    -webkit-transform: rotate(45deg);
+    -o-transform: rotate(45deg);
+    -ms-transform: rotate(45deg);
+    transform: rotate(45deg);
+}
+
+.trigger.effect-skew {
+    -moz-transform: translateY(100px) skewX(-45deg) skewY(45deg);
+    -webkit-transform: translateY(100px) skewX(-45deg) skewY(45deg);
+    -o-transform: translateY(100px) skewX(-45deg) skewY(45deg);
+    -ms-transform: translateY(100px) skewX(-45deg) skewY(45deg);
+    transform: translateY(100px) skewX(-45deg) skewY(45deg);
+}

src/assets/dist/js/gevman-lazyload.js

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+GevManLazyLoadPlugin = new (function($){
+    var effects = ['effect-slideup', 'effect-slidedown', 'effect-slidefromleft', 'effect-slidefromright', 'effect-zoomin', 'effect-zoomout', 'effect-rotate', 'effect-skew']
+    this.useCSSAnimations = jQuery('.cssanimations').length;
+    this.defaultDelay = undefined;
+    this.defaultSpeed = undefined;
+    var callbacks = []
+
+    var that = this;
+    function getWindowHeight() {
+        var myWidth = 0, myHeight = 0;
+        if( typeof( window.innerWidth ) == 'number' ) {
+            //Non-IE
+            myHeight = window.innerHeight;
+        } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
+            //IE 6+ in 'standards compliant mode'
+            myHeight = document.documentElement.clientHeight;
+        } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
+            //IE 4 compatible
+            myHeight = document.body.clientHeight;
+        }
+
+        return myHeight
+    };
+
+    function appearBox(element, element_top, bottom_of_window) {
+        var buffer = $(element).outerHeight()/2;
+        if( bottom_of_window > element_top + buffer) {
+            setTimeout(function(){
+                if ( that.useCSSAnimations ) {
+                    element.removeClass('trigger');
+                } else {
+                    element.removeClass('trigger').animate({'opacity':'1'}, 0);
+                }
+                /* Check if there is a callback associated with this element. */
+                if (element.data('callback-id') !== undefined) {
+                    var callback_id = element.data('callback-id');
+                    if(callback_id >= 0 && callback_id < callbacks.length)
+                        callbacks[callback_id](element);
+                }
+            }, element.data('delay') !== undefined? element.data('delay') : that.defaultDelay);
+        }
+    };
+
+    function registerAnimation(element, effect, delay, speed, callback) {
+        var effect = effect || 'random'
+        if(effect == 'random'){
+            effect = effects[Math.floor(Math.random() * effects.length)];
+        }
+        $(element).addClass('lazy-load-box').addClass('trigger').addClass(effect);
+
+        if(delay !== undefined)
+            $(element).data('delay', delay);
+
+        if(speed !== undefined)
+            $(element).data('speed', speed);
+
+        if(callback !== undefined) {
+            count = callbacks.push(callback);
+            $(element).data('callback-id', count - 1);
+        }
+    };
+    this.registerAnimation = registerAnimation;
+
+    $.fn.GevManLazyLoadPlugin = function(effect, delay, speed, callback) {
+        $(this).each(function(){
+            registerAnimation(this, effect, delay, speed, callback);
+        });
+    };
+
+    $(function() {
+        if(!device.mobile() && !device.tablet()){
+            $('.lazy-load-box.trigger').each( function(i){
+                var element_offset = $(this).offset();
+                var element_top = element_offset.top;
+                var bottom_of_window = $(window).scrollTop() + getWindowHeight();
+                appearBox($(this), element_top, bottom_of_window);
+            });
+
+            $(window).scroll( function() {
+                $('.lazy-load-box.trigger').each( function(i){
+                    var element_offset = $(this).offset(),
+                        element_top = element_offset.top,
+                        bottom_of_window = $(window).scrollTop() + getWindowHeight();
+
+                    appearBox($(this), element_top, bottom_of_window);
+                });
+
+            });
+        } else {
+            $('.lazy-load-box').each( function(i) {
+                $(this).removeClass('trigger').css('opacity', '1');
+            });
+        }
+    });
+})(jQuery);