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HTML

            
              <html ng-app="example">
<head>
	<meta charset="utf-8">
	<title>Elastic image</title>
	<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
	<link href="//code.ionicframework.com/1.0.0-rc.5/css/ionic.css" rel="stylesheet">
	<script src="//code.ionicframework.com/1.0.0-rc.5/js/ionic.bundle.js"></script>
</head>

<body>
	<ion-header-bar class="bar-positive">
		<div class="buttons">
			<button class="button button-icon ion-navicon"></button>
		</div>
		<h1 class="title">Elastic image</h1>
	</ion-header-bar>

	<div id="the-image-id" class="elastic-image" style="background-image: url(https://ununsplash.imgix.net/photo-1421091242698-34f6ad7fc088?fit=crop&fm=jpg&h=650&q=75&w=950)"></div>
	
	<ion-content elastic-image="the-image-id" class="padding">
		<div class="the-content">
				<h2>Elastic image</h2>
				<p>This is an experiment with an elastic image in Ionic Framework. Note that this is a quick hack, see it as a proof of concept. If some ionic/angular-guru could refine this into something production ready you are welcome to do so.</p>
			<p>Note: This implementation works by using a combination of background-size: cover and a variable height. This is not great performance wise. It should be re-written using only GPU-friendly properties (i.e. Translate, Scale) so the browser won't have to re-paint on scroll.</p>
			<p>It should also be improved by using Request Animation Frame for the animation.</p>
			<div class="list">
				<div class="item">1</div>
				<div class="item">2</div>
				<div class="item">3</div>
				<div class="item">4</div>
				<div class="item">5</div>
				<div class="item">6</div>
				<div class="item">7</div>
				<div class="item">8</div>
				<div class="item">9</div>
				<div class="item">10</div>
				<div class="item">12</div>
				<div class="item">13</div>
				<div class="item">14</div>
				<div class="item">15</div>
			</div>
		</div>
	</ion-content>

</body>

</html>
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CSS

            
              .elastic-image {
	background-size: cover;
	background-position: center;
	background-repeat: no-repeat;
	margin-top: 44px;
	/* Initial image height: */
	height: 300px;
}

.the-content {
	/* Same as initial image height: */
	padding-top: 300px;
}

body {
	cursor: url('https://ionicframework.com/img/finger.png'), auto;
}
!

JS

            
              angular.module('example', ['ionic'])

.directive('elasticImage', function($ionicScrollDelegate) {
	return {
		restrict: 'A',
		link: function($scope, $scroller, $attr) {
			var image = document.getElementById($attr.elasticImage);
      var imageHeight = image.offsetHeight;
			
			$scroller.bind('scroll', function(e) {
				var scrollTop = e.detail.scrollTop;
				var newImageHeight = imageHeight - scrollTop;
				if (newImageHeight < 0) {
					newImageHeight = 0;
				}
				image.style.height = newImageHeight + 'px';
			});
		}
	}
});
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999px
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