cachrisman/index.html

## index.html
<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <!-- UI Extensions CSS -->
  <link rel="stylesheet" href="//contentful.github.io/ui-extensions-sdk/cf-extension.css">
  <!-- UI Extensions SDK -->
  <script src="//contentful.github.io/ui-extensions-sdk/cf-extension-api.js"></script>
  <style>

  </style>
</head>

<body>
  <!-- Custom markup of the UI Extension -->
  <button id="randomImage" class="cf-btn-primary">Generate Random Image</button>
  <img src="" id="image">
  <!-- Custom logic of the UI Extension -->
  <script>
    window.contentfulExtension.init(extension => {
      document.getElementById('randomImage').addEventListener('click', () => {
        extension.window.updateHeight(1600)
        const key = 'unsplash';
        const url = `https://source.${key}.com/random/2560x1440?random-${new Date().getTime()}`;
        let image = document.getElementById('image')
        image.src = url;
        console.log(url);
        extension.entry.fields['url'].setValue(url);
      })
    });
  </script>
</body>

</html>
	<!DOCTYPE html>
	<html>

	<head>
	<meta charset="utf-8">
	<!-- UI Extensions CSS -->
	<link rel="stylesheet" href="//contentful.github.io/ui-extensions-sdk/cf-extension.css">
	<!-- UI Extensions SDK -->
	<script src="//contentful.github.io/ui-extensions-sdk/cf-extension-api.js"></script>
	<style>

	</style>
	</head>

	<body>
	<!-- Custom markup of the UI Extension -->
	<button id="randomImage" class="cf-btn-primary">Generate Random Image</button>
	<img src="" id="image">
	<!-- Custom logic of the UI Extension -->
	<script>
	window.contentfulExtension.init(extension => {
	document.getElementById('randomImage').addEventListener('click', () => {
	extension.window.updateHeight(1600)
	const key = 'unsplash';
	const url = `https://source.${key}.com/random/2560x1440?random-${new Date().getTime()}`;
	let image = document.getElementById('image')
	image.src = url;
	console.log(url);
	extension.entry.fields['url'].setValue(url);
	})
	});
	</script>
	</body>

	</html>