Populate text area on single Posts with Post content in Genesis

functions.php

add_action( 'wp_enqueue_scripts', 'sk_enqueue_script_on_posts' );
function sk_enqueue_script_on_posts() {
/**
 * Load a js file on Post pages and localize it with Post's data
 *
 * Context: Single Post pages
 *
 * @author Sridhar Katakam
 * @link   http://sridharkatakam.com/
 */
	if ( ! is_singular( 'post' ) ) {
		return;
	}

	wp_enqueue_script( 'single-posts',  get_stylesheet_directory_uri() . '/js/single-posts.js', array( 'jquery' ), '1.0.0', true );

	/* Get the post title */
	$post_title = get_post_field( 'post_title', $post_id );

	/* Get the raw post content */
	$post_content = get_post_field( 'post_content', $post_id, 'raw' );

	/* Get the Post's URL */
	$post_url = get_permalink();

	$entry_html = '<h1>' . $post_title . '</h1><div>' . $post_content . '<p>Originally published at <a href="' . $post_url . '">' . $post_url . '</a></p></div>';

	wp_localize_script( 'single-posts', 'EntryHTML', array( 'entry_html' => $entry_html ) );

}


add_action( 'genesis_entry_footer', 'sk_copy_source' );
/**
 * Display a textarea containing the current entry's HTML source
 *
 * Context: Single Post pages
 *
 */
function sk_copy_source() {
	if ( ! is_singular( 'post' ) ) {
		return;
	} ?>

	<div class="entry-html-box">
		<p>Want this free content on your website or in a newsletter? Below is the html version so you can copy and paste with ease.</p>
		<textarea id="entry-html"></textarea>
	</div>
<?php }

single.posts.js

jQuery(function( $ ){

	$("textarea#entry-html").text(EntryHTML.entry_html);

	$('textarea#entry-html').focus(function() {
		var $this = $(this);

		$this.select();

		window.setTimeout(function() {
		    $this.select();
		}, 1);

		// Work around WebKit's little problem
		function mouseUpHandler() {
		    // Prevent further mouseup intervention
		    $this.off("mouseup", mouseUpHandler);
		    return false;
		}

		$this.mouseup(mouseUpHandler);
	});
	
});

style.css

/* Textarea containing the current entry's HTML source */

.entry-html-box {
	margin-top: 40px;
	border-top: 1px dotted #333;
	padding-top: 30px;
}

#entry-html {
	height: 100px;
	color: #333;
	font: 12px "Courier New", Courier, mono;
}