wordpress/php-fpm/wordpress_files/themes/shell-lite/js/featured-img-uploader.js

jQuery( document ).ready( function( $ ) {

	var custom_uploader;
	
	$( '#featured_image_upload_button' ).click( function( e ) {
	
		e.preventDefault();
		
		// If the uploader object has already been created, reopen the dialog
		if ( custom_uploader ) {
			custom_uploader.open();
			return;
		}
	
		// Extend the wp.media object
		custom_uploader = wp.media.frames.file_frame = wp.media( {
			title : 'Choose Image',
			button : {
				text : 'Choose Image'
			},
			multiple : false
		} );
	
		// When a file is selected, grab the URL and set it as the text field's value
		custom_uploader.on( 'select', function() {
			attachment = custom_uploader.state().get(
				'selection' ).first().toJSON();
			$( '#shell_theme_options\\[featured_image\\]' ).val( attachment.url );
		});
	
		// Open the uploader dialog
		custom_uploader.open();
	});
});