Image Upload Previewer is a jQuery plugin that preview your uploaded image using browser file upload button in an tag.
See: Demo
To get started, download the file jquery.image_upload_previewer.js and copy to your website/application directory.
Load it in the section of your HTML document. Make sure you also add the jQuery library.
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript" src="/jquery.image_upload_previewer.js"></script>
</head>
Create your file input with id uploader:
<input type="file" id="uploader">
Then create placeholder for the preview image:
<img id="placeholder">
Finally initalize it in javascript file.
$('#placeholder').previewImage({uploader: '#uploader'});