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

              
                
              
            
!

CSS

              
                
              
            
!

JS

              
                function print(data) {
  let p = document.createElement('p');
  p.innerHTML = data;
  document.body.append(p);
}

function getInfo (userID, callback) {
	let info = null;

	// we make the pseudo-request, based on the user ID
	setTimeout( function() {
		// now the data (response) is received as follows
		info = {
			name: 'Percy',
			friends: [ 'Joan', 'Fred', 'Cassy'],
			isActive: false
		};
		
		// we then pass the info as a parameter to the callback
		callback(info);
	}, 2000);
}


// we call the getInfo function and then do something else with the callback
getInfo('ehdjsd78934hdfkd', function(info) {
	// we now have access to the info object from the server response
  let status = info.isActive ? 'online' : 'offline';
  
	print(info.name + ' is ' + status + '.' );
});
              
            
!
999px

Console