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HTML

              
                <!--
gandul. Accessible Image Lazy Loading / more info: 
 - Documentation : https://moro.es/projects/gandul-accessible-image-lazy-loading/
 - GitHub repo : https://github.com/alterebro/accessible-image-lazy-load
 - NPM Module : https://www.npmjs.com/package/accessible-image-lazy-load
-->

<header>
    <p><img src="https://cdn.jsdelivr.net/gh/alterebro/accessible-image-lazy-load/gandul.png" width="128" alt="gandul!" /></p>

    <h1><strong>gandul</strong> : <a href="https://moro.es/projects/gandul-accessible-image-lazy-loading/" title="Accessible Image Lazy Loading" target="_blank">accessible image lazy loading</a></h1>
    <p>
        <a href="https://github.com/alterebro/accessible-image-lazy-load/blob/master/LICENSE"><img src="https://img.shields.io/github/license/alterebro/accessible-image-lazy-load.svg" alt="MIT license"></a>
        <a href="https://www.npmjs.com/package/accessible-image-lazy-load"><img src="https://img.shields.io/npm/v/accessible-image-lazy-load.svg" alt="NPM Version"></a>
        <a href="https://github.com/alterebro/accessible-image-lazy-load/blob/master/dist/gandul.min.js"><img src="https://img.shields.io/github/size/alterebro/accessible-image-lazy-load/dist/gandul.min.js.svg" alt="File Size"></a>
        <a href="https://twitter.com/alterebro"><img src="https://img.shields.io/twitter/follow/alterebro.svg" alt="Twitter"></a>
    </p>
	<hr />
</header>

<main>
	<p>
		Gandul is a lightweight non-dependant javascript module that adds a different approach on lazy loading focusing on accessibility. It works by taking a common anchor hyperlink as data source and transforms it into an image element. This way you don't lose the reference to the image and when no JavaScript, the image will still be accessible. Further info about gandul: 
	</p>
	<ul>
		<li>Documentation : <strong><a href="https://moro.es/projects/gandul-accessible-image-lazy-loading/" title="Accessible lazy loading">moro.es/projects/gandul-accessible-image-lazy-loading/</a></strong></li>
		<li>GitHub repo : <strong><a href="https://github.com/alterebro/accessible-image-lazy-load">github.com/alterebro/accessible-image-lazy-load</a></strong></li>
	</ul>
	
	<hr />
	
	<h3>Width attribute on the images</h3>
    <section>
        <div>
            <p><a href="https://placekitten.com/640/480" data-width="320" class="gandul">Nice kitten</a></p>
        </div>
        <pre><code class="html">&lt;a href="https://placekitten.com/640/480" data-width="320" class="gandul"&gt;Nice kitten&lt;/a&gt;&lt;/p&gt;</code></pre>
    </section>
    <section>
        <div>
            <p><a href="https://placekitten.com/960/720" data-width="320" class="gandul">Nice kitten</a></p>
        </div>
        <pre><code class="html">&lt;p&gt;&lt;a href="https://placekitten.com/960/720" data-width="320" class="gandul"&gt;Nice kitten&lt;/a&gt;&lt;/p&gt;</code></pre>
    </section>
    <section>
        <div>
            <p>
                <a href="https://cdn.jsdelivr.net/gh/alterebro/accessible-image-lazy-load/gandul.png" data-width="128" class="gandul">gandul!</a>
                <a href="https://cdn.jsdelivr.net/gh/alterebro/accessible-image-lazy-load/gandul.png" data-width="128" class="gandul">gandul!</a>
                <a href="https://cdn.jsdelivr.net/gh/alterebro/accessible-image-lazy-load/gandul.png" data-width="128" class="gandul">gandul!</a>
            </p>
        </div>
        <pre><code class="html">&lt;p&gt;
	&lt;a href="../gandul.png" data-width="128" class="gandul"&gt;gandul!&lt;/a&gt;
	&lt;a href="../gandul.png" data-width="128" class="gandul"&gt;gandul!&lt;/a&gt;
	&lt;a href="../gandul.png" data-width="128" class="gandul"&gt;gandul!&lt;/a&gt;
&lt;/p&gt;</code></pre>
    </section>
    <hr />

    <h3>Responsive image (sizes &amp; srcset)</h3>
    <section>
        <div>
            <p>
                <a href="https://placekitten.com/800/400"
                   data-srcset="https://placekitten.com/320/160 320w,
                             https://placekitten.com/480/240 480w,
                             https://placekitten.com/800/400 800w"
                   data-sizes="(max-width: 320px) 280px,
                            (max-width: 480px) 440px,
                            800px"
                   class="gandul">Nice kitten</a>
            </p>
        </div>
        <pre><code class="html">&lt;p&gt;
&lt;a href="https://placekitten.com/800/400"
   data-srcset="https://placekitten.com/320/160 320w,
             https://placekitten.com/480/240 480w,
             https://placekitten.com/800/400 800w"
   data-sizes="(max-width: 320px) 280px,
            (max-width: 480px) 440px,
            800px"
   class="gandul"&gt;Nice kitten&lt;/a&gt;
&lt;/p&gt;</code></pre>
    </section>
    <hr />

	<h3>Images with <code>id</code> and <code>class</code> attributes</h3>
    <section>
        <div>
            <p><a href="https://placekitten.com/600/400" id="cat" class="nice kitten gandul">Nice kitten</a></p>
        </div>
        <pre><code class="html">&lt;p&gt;&lt;a href="https://placekitten.com/600/400" id="cat" class="nice kitten gandul"&gt;Nice kitten&lt;/a&gt;&lt;/p&gt;</code></pre>
    </section>
    <section>
        <div>
            <p><a href="https://placekitten.com/500/500" id="kitty" class="square kitty gandul">Another Nice kitten</a></p>
        </div>
        <pre><code class="html">&lt;p&gt;
	&lt;a href="https://placekitten.com/500/500" id="kitty" class="square kitty gandul"&gt;Another Nice kitten&lt;/a&gt;
&lt;/p&gt;</code></pre>
    </section>
    <hr />

    <h3>Element with all options and callback action when image load finishes :</h3>
    <section>
        <div>
            <p><a href="https://placekitten.com/1200/600" class="gandul-hyperlink">Cat image</a></p>
        </div>
        <pre><code class="html">&lt;p&gt;&lt;a href="https://placekitten.com/1200/600" class="gandul-hyperlink"&gt;Cat image&lt;/a&gt;&lt;/p&gt;

&lt;!-- gandul --&gt;
&lt;script&gt;
gandul('a.gandul-hyperlink', { threshold: .5 }, function(el) {
	el.style.border = 'solid #fff 20px';
	console.log(el);
});
&lt;/script&gt;</code></pre>
    </section>
    <hr />
	
    <h3>Apply to different elements than <code>&lt;a&gt;</code> hyperlinks</h3>
    <section>
        <div>
            <p>
                <a href="https://placekitten.com/1200/420">
                    <picture class="gandul" data-href="https://placekitten.com/1200/420">This is a test</picture>
                </a>
            </p>
        </div>
        <pre><code class="html">&lt;p&gt;
    &lt;a href="https://placekitten.com/1200/420"&gt;
    	&lt;picture class="gandul" data-href="https://placekitten.com/1200/420"&gt;This is a test&lt;/picture&gt;
    &lt;/a&gt;
&lt;/p&gt;</code></pre>
    </section>
    <section>
        <div>
            <span class="gandul" data-href="https://placekitten.com/1200/400">This is another test</picture>
        </div>
        <pre><code class="html">&lt;span class="gandul" data-href="https://placekitten.com/1200/400"&gt;This is another test&lt;/picture&gt;</code></pre>
    </section>

    <hr />	
</main>

<footer>
    <div><a href="https://moro.es/projects/gandul-accessible-image-lazy-loading/" title="Accessible Image Lazy Loading"><strong>gandul</strong> 😴 : accessible-image-lazy-load</a> <em>( <a href="https://github.com/alterebro/accessible-image-lazy-load#readme">GitHub Repo</a> )</em></div>
</footer>

              
            
!

CSS

              
                html, body, h1, h2, h3, p, pre {
    margin: 0;
    padding: 0;
}
html {
    box-sizing: border-box;
	font-size: 62.5%;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
    font-size: 1.6em;
    line-height: 1.7;
    width: 90%;
    max-width: 92rem;
    margin: 4rem auto;
}
*, *:before, *:after {
	box-sizing: inherit;
	background-repeat: no-repeat;
}
a {
    color: #069;
    text-decoration: none;
	&:hover {
		color: #000;
		text-decoration: underline;		
	}
}
header {
	text-align: center;
	padding: 2rem 0;
	h1 {
		 font-size: 32px;
		 font-weight: 400;
		 letter-spacing: -1px;
		 line-height: 1.4;
	}
	p { margin: 1rem 0 2rem; }
}
h3 {
    font-size: 24px;
    margin: 0 0 2rem;
    line-height: 1.4;
}
hr {
    box-sizing: content-box;
    height: 0;
    overflow: visible;
	background: none;
	border: none;
	border-top: dotted #333 1px;
	margin: 4rem 0;
}
section { 
	margin: 0 0 2rem; 

	> div {
		min-height: 24rem;
		box-shadow: inset 0 0 0 1px #eee;
		background: #eee;
		display: flex;
		justify-content: center;
		align-items: center;
		padding: 20px;
	}
	> pre { 
		width: 100%; 
	    font-family: "Andale Mono", "Monaco", "Lucida Console", "Menlo", "Consolas", "Roboto Mono", "Liberation Mono", monospace;
	}
}
footer {
    text-align: center;
    font-size: 1.3rem;
}

// ---------

img.gandul, img.gandul-hyperlink {
    display: inline-block;
    border-radius: 3px;
    max-width: 100%;
    opacity: 0;
    transition: all 1s ease-in-out;
}
img.gandul-active { opacity: 1; }

// ---------


/* highlight.js */
.hljs {
    display: block;
    overflow-x: auto;
    padding: 2rem;
    font-family: "Andale Mono", "Monaco", "Lucida Console", "Menlo", "Consolas", "Roboto Mono", "Liberation Mono", monospace;
    font-size: 1.1rem;
    line-height: 1.5;
    box-shadow: inset 0 0 0 1px #eee;
}
.hljs, .hljs-subst { color: #555 }
.hljs-attr { color: #06f; font-weight: bold; }
.hljs-comment { color: #999; font-style: italic; }
.hljs-keyword, .hljs-attribute, .hljs-selector-tag, .hljs-meta-keyword, .hljs-doctag, .hljs-name { color: #069; font-weight: bold }
.hljs-title, .hljs-section { color: #880000; font-weight: bold }
.hljs-type, .hljs-string, .hljs-number, .hljs-selector-id, .hljs-selector-class, .hljs-quote, .hljs-template-tag, .hljs-deletion { color: #09f; }
.hljs-regexp, .hljs-symbol, .hljs-variable, .hljs-template-variable, .hljs-link, .hljs-selector-attr, .hljs-selector-pseudo { color: #BC6060 }
.hljs-literal { color: #78A960 }
.hljs-built_in, .hljs-bullet, .hljs-code, .hljs-addition { color: #90f; font-weight: bold; }
.hljs-meta { color: #1f7199 }
.hljs-meta-string { color: #4d99bf }
.hljs-emphasis { font-style: italic }
.hljs-strong { font-weight: bold }
              
            
!

JS

              
                /*
- Documentation : https://moro.es/projects/gandul-accessible-image-lazy-loading/
- GitHub repo 	: https://github.com/alterebro/accessible-image-lazy-load
- NPM Module 	: https://www.npmjs.com/package/accessible-image-lazy-load
*/

// highlight code
hljs.initHighlightingOnLoad();

// gandul stuff
let a = gandul();
let b = gandul('a.gandul-hyperlink', { threshold: .5 }, function(el) {
    el.style.border = 'solid #fff 20px';
    console.log(el);
});
let c = gandul('a.non-existant');
let d = gandul('picture.gandul');
let e = gandul('span.gandul');

console.log(a);
console.log(b);
console.log(c); // It should return false
console.log(d);
console.log(e);


              
            
!
999px

Console