zlove/gist:3b9b6a611715ec3a8a60

## gistfile1.phtml
<?php
/**
 * Quick hack to preview WooCommerce e-mails.
 * Based on drrobotnik's answer from Stack Overflow: http://stackoverflow.com/a/27072101/186136
 *
 * Add this to <yourtheme>/functions.php and then visit a url like:
 * http://<site_url>/wp-admin/admin-ajax.php?action=previewemail
 *
 * @return null
 */
function mytheme_preview_email() {
    global $woocommerce;

    if ( ! is_admin() ) {
        return null;
    }

    $mailer = $woocommerce->mailer();
    $email_options = array();

    foreach ( $mailer->emails as $key => $obj ) {
        $email_options[$key] = $obj->title;
    }

    $in_order_id = isset( $_GET['order'] ) ? $_GET['order'] : '';
    $in_email_type = isset( $_GET['email_type'] ) ? $_GET['email_type'] : '';

    $order_number = is_numeric( $in_order_id ) ? (int) $in_order_id : '';
    $email_class = isset( $email_options[ $in_email_type ] ) ? $in_email_type : '';
    $order = $order_number ? wc_get_order( $order_number ) : false;

    $error = '';
    $email_html = '';

    if ( ! $in_order_id && ! $in_email_type ) {
        $error = '<p>Please select an email type and enter an order #</p>';
    } elseif ( ! $email_class ) {
        $error = '<p>Bad email type</p>';
    } elseif ( ! $order ) {
        $error = '<p>Bad order #</p>';
    } else {
        $email = $mailer->emails[$email_class];
        $email->object = $order;
        $email_html = apply_filters( 'woocommerce_mail_content', $email->style_inline( $email->get_content_html() ) );
    }


?>
<!DOCTYPE HTML>
<html>
<head></head>
<body>
<form method="get" action="<?php echo site_url(); ?>/wp-admin/admin-ajax.php">
    <input type="hidden" name="action" value="previewemail">
    <select name="email_type">
        <option value="--">Email Type</option>
        <?php
            foreach( $email_options as $class => $label ){
                if ( $email_class && $class == $email_class ) {
                    $selected = 'selected';
                } else {
                    $selected = '';
                }
            ?>
                <option value="<?php echo $class; ?>" <?php echo $selected; ?> ><?php echo $label; ?></option>
        <?php } ?>
        </select>
    <input type="text" name="order" value="<?php echo $order_number; ?>" placeholder="order #">
    <input type="submit" value="Go">
</form>
<?php
if ( $error ) {
    echo "<div class='error'>$error</div>";
} else {
    echo $email_html;
}
?>
</body>
</html>

<?php
    return null;
}

add_action('wp_ajax_previewemail', 'mytheme_preview_email');
	<?php
	/**
	* Quick hack to preview WooCommerce e-mails.
	* Based on drrobotnik's answer from Stack Overflow: http://stackoverflow.com/a/27072101/186136
	*
	* Add this to <yourtheme>/functions.php and then visit a url like:
	* http://<site_url>/wp-admin/admin-ajax.php?action=previewemail
	*
	* @return null
	*/
	function mytheme_preview_email() {
	global $woocommerce;

	if ( ! is_admin() ) {
	return null;
	}

	$mailer = $woocommerce->mailer();
	$email_options = array();

	foreach ( $mailer->emails as $key => $obj ) {
	$email_options[$key] = $obj->title;
	}

	$in_order_id = isset( $_GET['order'] ) ? $_GET['order'] : '';
	$in_email_type = isset( $_GET['email_type'] ) ? $_GET['email_type'] : '';

	$order_number = is_numeric( $in_order_id ) ? (int) $in_order_id : '';
	$email_class = isset( $email_options[ $in_email_type ] ) ? $in_email_type : '';
	$order = $order_number ? wc_get_order( $order_number ) : false;

	$error = '';
	$email_html = '';

	if ( ! $in_order_id && ! $in_email_type ) {
	$error = '<p>Please select an email type and enter an order #</p>';
	} elseif ( ! $email_class ) {
	$error = '<p>Bad email type</p>';
	} elseif ( ! $order ) {
	$error = '<p>Bad order #</p>';
	} else {
	$email = $mailer->emails[$email_class];
	$email->object = $order;
	$email_html = apply_filters( 'woocommerce_mail_content', $email->style_inline( $email->get_content_html() ) );
	}


	?>
	<!DOCTYPE HTML>
	<html>
	<head></head>
	<body>
	<form method="get" action="<?php echo site_url(); ?>/wp-admin/admin-ajax.php">
	<input type="hidden" name="action" value="previewemail">
	<select name="email_type">
	<option value="--">Email Type</option>
	<?php
	foreach( $email_options as $class => $label ){
	if ( $email_class && $class == $email_class ) {
	$selected = 'selected';
	} else {
	$selected = '';
	}
	?>
	<option value="<?php echo $class; ?>" <?php echo $selected; ?> ><?php echo $label; ?></option>
	<?php } ?>
	</select>
	<input type="text" name="order" value="<?php echo $order_number; ?>" placeholder="order #">
	<input type="submit" value="Go">
	</form>
	<?php
	if ( $error ) {
	echo "<div class='error'>$error</div>";
	} else {
	echo $email_html;
	}
	?>
	</body>
	</html>

	<?php
	return null;
	}

	add_action('wp_ajax_previewemail', 'mytheme_preview_email');