Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <body>
  <h1>Demonstrating <code>fm=json</code> parameter to set aspect ratios based on original image sizes using imgix.</h1>
  
  <br></br>
  <p>Originally, we cropped all of our images to fit within the same aspect ratio. Originals were set to <code>w=300</code>, <code>h=200</code>, and <code>fit=crop</code>.</p>
  <image-container>
    <img src="https://assets.imgix.net/examples/octopus.jpg?w=300&h=200&fit=crop">
  </image-container>
  <image-container>
    <img src="https://assets.imgix.net/examples/espresso.jpg?w=300&h=200&fit=crop">
  </image-container>
  <image-container>
    <img src="https://miguel.imgix.net/imgix/flower.jpg?w=300&h=200&fit=crop">
  </image-container>
  <image-container>
    <img src="https://assets.imgix.net/examples/kayaks.png?w=300&h=200&fit=crop">
  </image-container>
  <p>Eventually, we decided that we wanted to maintain the aspect ratios of the source images. We can now do that using the <a href="https://www.imgix.com/docs/reference/format#param-fm">imgix JSON Output Format</a>. In this pen, we use JavaScript to read metadata about an image then set a max dimensions with the longest edge of 300px and a 16:9 ratio.</p>
  <image-container>
    <img data-src="https://assets.imgix.net/examples/octopus.jpg" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="imgix-item">
  </image-container>
  <image-container>
    <img data-src="https://assets.imgix.net/examples/espresso.jpg" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="imgix-item">
  </image-container>
  <image-container>
    <img data-src="https://miguel.imgix.net/imgix/flower.jpg" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="imgix-item">
  </image-container>
  <image-container>
    <img data-src="https://assets.imgix.net/examples/kayaks.png" src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="imgix-item">
  </image-container>
<p>
  Without storing any information server-side, we're able to build rich displays of our images based on their natural aspect ratios. This opens up a whole new way of working with images on imgix.
</p>

<p>imgix is a hosted service that takes your existing static images and turns them into dynamic, responsive images that you can deliver to any device, under any conditions. It’s free to sign up at <a href="https://imgix.com">imgix.com</a>.</p>
</body>
              
            
!

CSS

              
                body{
  text-align: center;
}

image-container {
  width: auto;
  display: inline-block;
  vertical-align: top;
  max-width: 1280px;
  height: auto;
  margin: 20px 0 20px 20px;
  
  img {
    max-width: 100%;
  }
}

h1, p{
  font-family:'Helvetica Neue', Helvetica, Arial, sans;
  max-width: 480px;
  margin: 1em auto 1em auto;
  text-align: left;
  line-height: 1.4;
  color: #333;
}

h1{
  line-height: 1.2;
  margin-top: 2em;
  margin-bottom: 0;
}

code{
  font-family: "Lucida Console",monaco,mono;
  color: #4b7498;
}
              
            
!

JS

              
                // Demonstrate the use of the `fm=json` parameter to resize images
// to a certain aspect ratio, using ES6.

let ratio = 16 / 9;
let maxSize = 300;

let placeImages = function() {
	jQuery('.imgix-item').each((i, value) => {
    let $elem = jQuery(value);    
    // We pull down the image specific by the 'data-src' attribute
    // of each .imgix-item, but append the "?fm=json" query string to it.
    // This instructs imgix to return the JSON Output Format instead of 
    // a manipulated image.
    let url = new imgix.URL($elem.attr('data-src'), { fm: "json" }).getUrl();
    
		jQuery.ajax(url).success((data) => {
      let newWidth, newHeight;

      // Next, we compute the new height/width params for 
      // each of our images.
      if (data.PixelHeight > data.PixelWidth) {
        newHeight = maxSize;
        newWidth = Math.ceil(newHeight / ratio);
      } else {
        newWidth = maxSize;
        newHeight = Math.ceil(newWidth / ratio);
      }

      // Now, we apply these to our actual images, setting the 'src'
      // attribute for the first time.
      $elem.get(0).src = new imgix.URL($elem.attr('data-src'), { 
        w: newWidth, 
        h: newHeight, 
        fit: "crop" 
      }).getUrl();
    })
  });
}

jQuery(document).ready(placeImages);
              
            
!
999px

Console