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 includes JSX processing.

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

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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

              
                
              
            
!

CSS

              
                body {
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-link {
  font-size: 1.25rem;
  font-weight: bold;
  padding: 1rem 2.5rem;
}
              
            
!

JS

              
                (() => {
  
  function downloadBlob(blob, filename) {
    // Create an object URL for the blob object
    const url = URL.createObjectURL(blob);

    // Create a new anchor element
    const a = document.createElement('a');

    // Set the href and download attributes for the anchor element
    // You can optionally set other attributes like `title`, etc
    // Especially, if the anchor element will be attached to the DOM
    a.href = url;
    a.download = filename || 'download';

    // Click handler that releases the object URL after the element has been clicked
    // This is required for one-off downloads of the blob content
    const clickHandler = function() {
      setTimeout(() => {
        // Release the object URL
        URL.revokeObjectURL(url);
        
        // Remove the event listener from the anchor element
        this.removeEventListener('click', clickHandler);
        
        // Remove the anchor element from the DOM
        (this.remove && (this.remove(), 1)) ||
        (this.parentNode && this.parentNode.removeChild(this));
      }, 150);
    };

    // Add the click event listener on the anchor element
    // a.addEventListener('click', clickHandler, false);

    // Programmatically trigger a click on the anchor element
    // Useful if you want the download to happen automatically
    // Without attaching the anchor element to the DOM
    // a.click();

    // Return the anchor element
    // Useful if you want a reference to the element
    // in order to attach it to the DOM or use it in some other way
    return a;
  }
  
  const square = ({ width = 1, height = width } = {}) => (width / height) === 1;
  
  const smallerThan = size => {
    return (Number.isFinite(size) && size >= 1)
      ? ({ width = 1, height = width } = {}) => Math.max(width, height) <= size
      : () => false;
  }
  
  const largerThan = size => {
    return (Number.isFinite(size) && size >= 1)
      ? ({ width = 1, height = width } = {}) => Math.min(width, height) >= size
      : () => false;
  }
  
  const format = type => {
    return (['jpeg', 'png'].includes(type))
      ? ({ format } = {}) => format === type
      : () => false;
  }
  
  const compose = (...fns) => (...args) => {
    let bool = true;
    
    for (let fn of fns.reverse()) {
      if (!bool) break;
      bool = bool && (typeof fn === 'function') && !!fn(...args);
    }
    
    return bool;
  }
  
  const collectionToCSV = (keys = []) => (collection = []) => {
    const headers = keys.map(key => {
      const [ access, output = access ] = [].concat(key);
      return `"${ (typeof output === 'function') ? access : output }"`;
    }).join(',');
    
    const values = record => keys.map(key => {
      const [ access, output = access, transform = output ] = [].concat(key);
      
      const [ ...values ] = Array.isArray(access)
        ? access.map(key => record[key] || null)
        : [ record[access] || null ];
        
      return `"${
        (typeof transform === 'function')
          ? transform(...values) || ''
          : values.filter(v => v !== null).join(' ')
      }"`;
    }).join(',');
    
    return collection.reduce((csv, record) => {
      return (`${csv}\n${values(record)}`).trim();
    }, headers);
  };
  
  const sizeTransform = (...dim) => dim.slice(0, 2).join(' x ');
  
  const orientationTransform = (w, h, o = w / h) => (
    o > 1 ? 'landscape' : o < 1 ? 'portrait' : 'square'
  ).toUpperCase();
  
  const csvExports = [
    'id',
    'author',
    'filename',
    [ 'format', format => format.toUpperCase() ],
    [ ['width', 'height'], 'size', sizeTransform ],
    [ ['width', 'height'], 'orientation', orientationTransform ]
  ];
  
  const filters = compose(
    largerThan(1500),
    smallerThan(2500),
    square,
    format('jpeg')
  );
  
  fetch('https://picsum.photos/list')
    .then(response => response.json())
    .then(data => data.filter(filters))
    .then(collectionToCSV(csvExports))
    .then(csv => {
      console.log(csv);
      const blob = new Blob([csv], { type: 'text/csv' });
    
      const downloadLink = downloadBlob(blob, 'photos.csv');
      
      // Set the title and classnames of the link
      downloadLink.title = 'Export Photos as CSV';
      downloadLink.classList.add('btn', 'btn-primary', 'download-link');

      // Set the text content of the download link
      downloadLink.textContent = 'Export Photos';

      // Attach the link to the DOM
      document.body.appendChild(downloadLink);
    })
    .catch(console.error);
})();


// function squareImages({ width = 1, height = width } = {}) {
//   return width / height === 1;
// }

// function collectionToCSV(keys = []) {
//   return (collection = []) => {
//     const headers = keys.map(key => `"${key}"`).join(',');
//     const extractKeyValues = record => keys.map(key => `"${record[key]}"`).join(',');

//     return collection.reduce((csv, record) => {
//       return (`${csv}\n${extractKeyValues(record)}`).trim();
//     }, headers);
//   }
// }

// const exportFields = [ 'id', 'author', 'filename', 'format', 'width', 'height' ];

// fetch('https://picsum.photos/list')
//   .then(response => response.json())
//   .then(data => data.filter(squareImages))
//   .then(collectionToCSV(exportFields))
//   .then(csv => {
//     const blob = new Blob([csv], { type: 'text/csv' });
//     downloadBlob(blob, 'photos.csv');
//   })
//   .catch(console.error);
              
            
!
999px

Console