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index.html
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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="description" content="Filtrify">
<meta name="keywords" content="javascript, react, lazy load, performance, mixin" />
<meta name="author" content="Sean Dokko">
<meta name="viewport" content="width=device-width">
<title>React Expose - A very lightweight mixin to lazy load images</title>
</head>
<style>
body {
background: #FFF;
color: #555;
font-family: "Helvetica Neue", sans-serif;
font-weight: 300;
line-height: 1.7;
padding: 30px 30px 300px 30px;
margin: 0 auto;
max-width: 480px;
}
header {
margin: 100px 0;
}
header p {
color: #CCC;
margin: 0 0 25px 0;
}
header h1 {
color: #000;
font-size: 75px;
line-height: 1;
margin: 0 0 10px 0;
}
header h1 small{
font-size: 16px;
}
h2 {
color: #333;
margin-top: 100px;
font-size: 1em;
}
p {
margin: 15px auto;
}
a {
color: #3595b5;
}
strong {
font-size: 1.5em;
color: #CCC;
}
code {
}
code > span.red {
color: #D14;
}
code > span.blue {
color: #099;
}
code > span.purple {
color: #C0C;
}
ul {
list-style: none;
padding: 0;
}
ul > li {
margin-top: 50px;
text-align: center;
}
ul > li > img {
display: inline-block;
max-width: 100%;
min-width: 48px;
min-height: 48px;
background-repeat: no-repeat;
background-image: 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<h1>Expose<small>.js</small></h1>
<p>A very lightweight mixin to lazy load images for React
<br/>
A port of unveil.js
</p>
</header>
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<h2 id="usage">Usage</h2>
<p>Use a placeholder image in the src attribute - something to be displayed while the original image loads - and include the actual image source in a “data-src” attribute.</p>
<p>If you want to serve high-resolution images to devices with retina displays, you just have to include the source for those images in a “data-src-retina” attribute.</p>
<p>You don’t need to include a “data-src-retina” attribute in all the image tags, expose is smart enough to fallback to “data-src” or even do nothing in case there isn’t any “data-src” specified.</p>
<pre class="prettyprint"><code class="language-js hljs "><span class="hljs-keyword">var</span> expose = <span class="hljs-built_in">require</span>(<span class="hljs-string">'expose'</span>);
<span class="hljs-keyword">var</span> Image = React.createClass({
mixins: [expose],
componentDidMount: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> {</span>
<span class="hljs-keyword">this</span>.expose();
},
render: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> {</span>
<span class="hljs-keyword">return</span> (
<span class="xml"><span class="hljs-tag"><<span class="hljs-title">img</span> <span class="hljs-attribute">data-src</span>=<span class="hljs-value">"http://placehold.it/350"</span> <span class="hljs-attribute">ref</span>=<span class="hljs-value">"image"</span>/></span>
);
}
});</span></code></pre>
<h2 id="threshold">Threshold</h2>
<p>By default, images are only loaded and “unveiled” when the user scrolls to them and they became visible on the screen.</p>
<p>If you want your images to load earlier than that, lets say 200px before they appear on the screen, you just have to:</p>
<pre class="prettyprint"><code class="language-js hljs "><span class="hljs-keyword">this</span>.expose(<span class="hljs-number">400</span>);</code></pre>
<h2 id="callback">Callback</h2>
<p>The callback after the image has been loaded</p>
<pre class="prettyprint"><code class="language-js hljs ">componentDidMount: <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> {</span>
<span class="hljs-keyword">this</span>.expose(<span class="hljs-number">300</span>, <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(
console.log('hello')</span>;
});
}</span></code></pre>
<h2 id="demo">Demo</h2>
<div id="images">
</div>
<p>If you’re on a “normal” display, unveil will load the low resolution version (800x500). In case you’re on a device with a retina display, the high resolution version (1280x800 in this case) will be loaded instead.</p>
<p>Scroll down to see it working - placeholder images from <a href="http://lorempixel.com/">lorempixel</a>.</p>
<h2>Browser support</h2>
<p>Compatible with All Browsers and IE7+.</p>
<h2>Download</h2>
<p>Download the script from the project page on <a href="https://github.com/dok/expose">GitHub</a>.</p>
<p>If you have any suggestion or bug to report please use github issues or get it touch with me on twitter - <a href="https://twitter.com/seandokko">@seandokko</a>.</p>
<h2>License</h2>
<p>Unveil is licensed under the <a href="http://opensource.org/licenses/MIT">MIT license</a>.</p>
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