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Edit File: completed.php

<?php

//	Exit if .php file accessed directly
if ( !defined( 'ABSPATH' ) ) exit;

class Dgx_Donate_Admin_Completed_View {
	function __construct() {
		add_action( 'dgx_donate_menu', array( $this, 'menu_item' ), 11 );
		add_action( 'admin_enqueue_scripts', array( $this, 'admin_enqueue_scripts' ) );
	}

function menu_item() {
		add_submenu_page(
			'dgx_donate_menu_page',
			__( 'Thank You Page', 'seamless-donations' ),
			__( 'Thank You Page', 'seamless-donations' ),
			'manage_options',
			'dgx_donate_thank_you_page',
			array( $this, 'menu_page' )
		);
	}

function menu_page() {
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( __( 'You do not have sufficient permissions to access this page.', 'seamless-donations' ) );
		}

// Get form arguments
		$thank_you_text = "";
		if ( isset( $_POST['thankstext'] ) ) {
			$thank_you_text = $_POST['thankstext'];
		}

// If we have form arguments, we must validate the nonce
		if ( count( $_POST ) ) {
			$nonce = $_POST['dgx_donate_thanks_nonce'];
			if ( ! wp_verify_nonce( $nonce, 'dgx_donate_thanks_nonce' ) ) {
				wp_die( __( 'You do not have sufficient permissions to access this page.', 'seamless-donations' ) );
			}
		}

// If they made changes, save them
		if ( ! empty( $thank_you_text ) ) {
			update_option( 'dgx_donate_thanks_text', $thank_you_text );
	    	$message = __( "Thank you page content updated.", 'seamless-donations' );
		}

do_action( 'dgx_donate_thanks_page_load' );

// Otherwise, proceed

echo "<div class='wrap'>\n";
		echo "<div id='icon-edit-pages' class='icon32'></div>\n";
		echo "<h2>" . esc_html__( 'Thank You Page', 'seamless-donations' ) . "</h2>\n";

// Display any message
		if ( ! empty( $message ) ) {
			echo "<div id='message' class='updated below-h2'>\n";
			echo "<p>" . esc_html( $message ) . "</p>\n";
			echo "</div>\n";
		}

$thank_you_text = get_option( 'dgx_donate_thanks_text' );
		$thank_you_text = stripslashes( $thank_you_text );

$nonce = wp_create_nonce( 'dgx_donate_thanks_nonce' );

echo "<div id='col-container'>\n";
		echo "<div id='col-right'>\n";
		echo "<div class='col-wrap'>\n";

echo "<h3>" . esc_html__( 'Thank You Page Details', 'seamless-donations' ) . "</h3>\n";

echo "<form method='POST' action=''>\n";
		echo "<input type='hidden' name='dgx_donate_thanks_nonce' value='" . esc_attr( $nonce ) . "' />\n";

echo "<div class='form-field'>";
		echo "<p><strong>" . esc_html__( 'Thank You Page Text', 'seamless-donations' ) . "</strong> - ";
		echo "<span class='description'>" . esc_html__( 'The text to display to the donor after they complete their donation.', 'seamless-donations' ) . "</span></p>";
		echo "<textarea style='resize: none;' name='thankstext' rows='3' cols='40'>" . esc_textarea( $thank_you_text ) . "</textarea>";
		echo "<br/><br/>";
		echo "</div>";

echo "<p><input id='submit' class='button' type='submit' value='" . esc_attr( 'Save Changes', 'dgx=donate' ) ."' name='submit'></p>\n";

echo "</form>";

do_action('dgx_donate_thanks_page_right');

do_action('dgx_donate_admin_footer');

echo "</div>\n";
		echo "</div>\n";

echo "<div id='col-left'>\n";
		echo "<div class='col-wrap'>\n";

echo "<h3>" . esc_html__( 'Thank You Page', 'seamless-donations' ) . "</h3>\n";
		echo "<p>" . esc_html__( 'On this page you can configure a special thank you message which will appear to your donors after they complete their donation.  This is separate from the thank you email that gets emailed to your donor.', 'seamless-donations' );
		echo "</p>\n";

echo "</form>";

do_action( 'dgx_donate_thanks_page_left' );

echo "</div>\n";
		echo "</div>\n";
		echo "</div>\n";

echo "</div>\n";
	}

function admin_enqueue_scripts() {
		wp_enqueue_script( 'jquery' );

$script_url = plugins_url( '../js/jquery.autosize.js', __FILE__ );
		wp_enqueue_script( 'dgx_donate_jquery_autosize', $script_url, array( 'jquery' ) );

$script_url = plugins_url( '../js/autosize-loader.js', __FILE__ );
		wp_enqueue_script( 'dgx_donate_autosize_loader', $script_url, array( 'jquery', 'dgx_donate_jquery_autosize' ) );
	}
}

$dgx_donate_admin_completed_view = new Dgx_Donate_Admin_Completed_View();