Joomla Image Comparison Slider Plugin

Simply put, it's just an image comparison plugin for Joomla. After installing it, you need to enable it on plugin manager (Content - JMP Image Comparison Slider).

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It works with Joomla 2.5+, 3, 4 and 5.

Then go to The Article or Custom Module and add the syntax below:

{ics data-before="URL of first image" data-after="URL of second image" data-before-text="Custom text for first image (Optional)" data-after-text="Custom text for second image (Optional)" }

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Example:

{ics data-before="image/pic1.jpeg" data-after="image/pic2.jpeg" data-before-text="Old" data-after-text="New" }

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List files:

• assets
  • cd-arrows.svg
  • jquery.mobile.custom.min.js
  • modernizr.js
  • script.js
  • style.css
• jmpics.php
• jmpics.xml

File: script.js

(function($){
	$(document).ready(function(){
		$('.jmpics').each(function(){
			let el=$(this), h='';

			if(typeof el.attr('data-before')=='undefined' || typeof el.attr('data-after')=='undefined') return;

			h='<figure class="cd-image-container">';
				h+='<img src="'+el.attr('data-before')+'" alt="">';
				if(typeof el.attr('data-before-text')!='undefined')
					h+='<span class="cd-image-label" data-type="original">'+el.attr('data-before-text')+'</span>';

				h+='<div class="cd-resize-img">';
					h+='<img src="'+el.attr('data-after')+'" alt="">';
					if(typeof el.attr('data-after-text')!='undefined')
						h+='<span class="cd-image-label" data-type="modified">'+el.attr('data-after-text')+'</span>';
				h+='</div>';
				h+='<span class="cd-handle"></span>';
			h+='</figure>';

			el.replaceWith(h);
		});

		// ics
		var dragging = false,
        scrolling = false,
        resizing = false;
	    
	    //cache jQuery objects
	    var imageComparisonContainers = $('.cd-image-container');
	    
	    //check if the .cd-image-container is in the viewport 
	    //if yes, animate it
	    checkPosition(imageComparisonContainers);
	    $(window).on('scroll', function(){
	        if( !scrolling) {
	            scrolling =  true;
	            ( !window.requestAnimationFrame )
	                ? setTimeout(function(){checkPosition(imageComparisonContainers);}, 100)
	                : requestAnimationFrame(function(){checkPosition(imageComparisonContainers);});
	        }
	    });
	    
	    //make the .cd-handle element draggable and modify .cd-resize-img width according to its position
	    imageComparisonContainers.each(function(){
	        var actual = $(this);
	        drags(actual.find('.cd-handle'), actual.find('.cd-resize-img'), actual, actual.find('.cd-image-label[data-type="original"]'), actual.find('.cd-image-label[data-type="modified"]'));
	    });

	    //upadate images label visibility
	    $(window).on('resize', function(){
	        if( !resizing) {
	            resizing =  true;
	            ( !window.requestAnimationFrame )
	                ? setTimeout(function(){checkLabel(imageComparisonContainers);}, 100)
	                : requestAnimationFrame(function(){checkLabel(imageComparisonContainers);});
	        }
	    });

	    function checkPosition(container) {
	        container.each(function(){
	            var actualContainer = $(this);
	            if( $(window).scrollTop() + $(window).height()*0.5 > actualContainer.offset().top) {
	                actualContainer.addClass('is-visible');
	            }
	        });

	        scrolling = false;
	    }

	    function checkLabel(container) {
	        container.each(function(){
	            var actual = $(this);
	            updateLabel(actual.find('.cd-image-label[data-type="modified"]'), actual.find('.cd-resize-img'), 'left');
	            updateLabel(actual.find('.cd-image-label[data-type="original"]'), actual.find('.cd-resize-img'), 'right');
	        });

	        resizing = false;
	    }

	    //draggable funtionality - credits to http://css-tricks.com/snippets/jquery/draggable-without-jquery-ui/
	    function drags(dragElement, resizeElement, container, labelContainer, labelResizeElement) {
	        dragElement.on("mousedown vmousedown", function(e) {
	            dragElement.addClass('draggable');
	            resizeElement.addClass('resizable');

	            var dragWidth = dragElement.outerWidth(),
	                xPosition = dragElement.offset().left + dragWidth - e.pageX,
	                containerOffset = container.offset().left,
	                containerWidth = container.outerWidth(),
	                minLeft = containerOffset + 10,
	                maxLeft = containerOffset + containerWidth - dragWidth - 10;
	            
	            dragElement.parents().on("mousemove vmousemove", function(e) {
	                if( !dragging) {
	                    dragging =  true;
	                    ( !window.requestAnimationFrame )
	                        ? setTimeout(function(){animateDraggedHandle(e, xPosition, dragWidth, minLeft, maxLeft, containerOffset, containerWidth, resizeElement, labelContainer, labelResizeElement);}, 100)
	                        : requestAnimationFrame(function(){animateDraggedHandle(e, xPosition, dragWidth, minLeft, maxLeft, containerOffset, containerWidth, resizeElement, labelContainer, labelResizeElement);});
	                }
	            }).on("mouseup vmouseup", function(e){
	                dragElement.removeClass('draggable');
	                resizeElement.removeClass('resizable');
	            });
	            e.preventDefault();
	        }).on("mouseup vmouseup", function(e) {
	            dragElement.removeClass('draggable');
	            resizeElement.removeClass('resizable');
	        });
	    }

	    function animateDraggedHandle(e, xPosition, dragWidth, minLeft, maxLeft, containerOffset, containerWidth, resizeElement, labelContainer, labelResizeElement) {
	        var leftValue = e.pageX + xPosition - dragWidth;   
	        //constrain the draggable element to move inside his container
	        if(leftValue < minLeft ) {
	            leftValue = minLeft;
	        } else if ( leftValue > maxLeft) {
	            leftValue = maxLeft;
	        }

	        var widthValue = (leftValue + dragWidth/2 - containerOffset)*100/containerWidth+'%';
	        
	        $('.draggable').css('left', widthValue).on("mouseup vmouseup", function() {
	            $(this).removeClass('draggable');
	            resizeElement.removeClass('resizable');
	        });

	        $('.resizable').css('width', widthValue); 

	        updateLabel(labelResizeElement, resizeElement, 'left');
	        updateLabel(labelContainer, resizeElement, 'right');
	        dragging =  false;
	    }

	    function updateLabel(label, resizeElement, position) {
	        if(position == 'left') {
	            ( label.offset().left + label.outerWidth() < resizeElement.offset().left + resizeElement.outerWidth() ) ? label.removeClass('is-hidden') : label.addClass('is-hidden') ;
	        } else {
	            ( label.offset().left > resizeElement.offset().left + resizeElement.outerWidth() ) ? label.removeClass('is-hidden') : label.addClass('is-hidden') ;
	        }
	    }
	});
})(jQuery);

File: style.css

.hidden{display:none!important}
.cd-image-container{position:relative;display:inline-block;max-width:768px;margin:0 auto}
.cd-image-container img{display:block}
.cd-image-label{position:absolute;bottom:0;right:0;color:#fff;padding:1em;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;opacity:0;-webkit-transform:translateY(20px);-moz-transform:translateY(20px);-ms-transform:translateY(20px);-o-transform:translateY(20px);transform:translateY(20px);-webkit-transition:-webkit-transform .3s 0.7s,opacity .3s .7s;-moz-transition:-moz-transform .3s 0.7s,opacity .3s .7s;transition:transform .3s 0.7s,opacity .3s .7s}
.cd-image-label.is-hidden{visibility:hidden}
.is-visible .cd-image-label{opacity:1;-webkit-transform:translateY(0);-moz-transform:translateY(0);-ms-transform:translateY(0);-o-transform:translateY(0);transform:translateY(0)}
.cd-resize-img{position:absolute;top:0;left:0;width:0;height:100%;overflow:hidden;-webkit-transform:translateZ(0);-moz-transform:translateZ(0);-ms-transform:translateZ(0);-o-transform:translateZ(0);transform:translateZ(0);-webkit-backface-visibility:hidden;backface-visibility:hidden}
.cd-resize-img img{position:absolute;left:0;top:0;display:block;height:100%;width:auto;max-width:none}
.cd-resize-img .cd-image-label{right:auto;left:0}
.is-visible .cd-resize-img{width:50%;-webkit-animation:cd-bounce-in .7s;-moz-animation:cd-bounce-in .7s;animation:cd-bounce-in .7s}
@-webkit-keyframes cd-bounce-in {
0%{width:0}
60%{width:55%}
100%{width:50%}
}
@-moz-keyframes cd-bounce-in {
0%{width:0}
60%{width:55%}
100%{width:50%}
}
@keyframes cd-bounce-in {
0%{width:0}
60%{width:55%}
100%{width:50%}
}
.cd-handle{position:absolute;height:44px;width:44px;left:50%;top:50%;margin-left:-22px;margin-top:-22px;border-radius:50%;background:#dc717d url(cd-arrows.svg) no-repeat center center;cursor:move;box-shadow:0 0 0 6px rgba(0,0,0,0.2),0 0 10px rgba(0,0,0,0.6),inset 0 1px 0 rgba(255,255,255,0.3);opacity:0;-webkit-transform:translate3d(0,0,0) scale(0);-moz-transform:translate3d(0,0,0) scale(0);-ms-transform:translate3d(0,0,0) scale(0);-o-transform:translate3d(0,0,0) scale(0);transform:translate3d(0,0,0) scale(0)}
.cd-handle.draggable{background-color:#445b7c}
.is-visible .cd-handle{opacity:1;-webkit-transform:translate3d(0,0,0) scale(1);-moz-transform:translate3d(0,0,0) scale(1);-ms-transform:translate3d(0,0,0) scale(1);-o-transform:translate3d(0,0,0) scale(1);transform:translate3d(0,0,0) scale(1);-webkit-transition:-webkit-transform .3s 0.7s,opacity 0 .7s;-moz-transition:-moz-transform .3s 0.7s,opacity 0 .7s;transition:transform .3s 0.7s,opacity 0 .7s}

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Please share it if you find it useful. The article is referenced from the CodyHouse.