Data not saved Wordpress Custom Admin Page - php

Question

I try to create an option page for a Wordpress theme. I manage to create the page, the Metaboxes , but when I send the form, the data are not saved. Before I show you my code , I specify that I use a class to generate the page more easily. Maybe this can guide you to the problem.
In this code I would like to save the "slide" option. This option is registred with register_setting() and visible in the slideshow_metabox() method that displays the form with fields that are named "slide [...]".
add_action('admin_menu', 'add_custom_admin_page');
function add_custom_admin_page(){
add_menu_page('CYBER Auto Pièces', 'CYBER Auto Pièces', 'manage_options', 'cyberautopieces', '' );
add_action( 'admin_init', 'cyberautopieces_register_settings' );
}
function cyberautopieces_register_settings() {
//register our settings
register_setting( 'cyberautopieces-settings', 'slide' );
}
new GeneratePageAdmin ('cyberautopieces','CYBER Auto Pièces','CYBER Auto Pièces', 'manage_options','cyberautopieces');
//Add some metaboxes to the page
add_action('add_meta_boxes','cyberautopieces_admin_metaboxes');
function cyberautopieces_admin_metaboxes(){
add_meta_box('slideshow_box','Slideshow','slideshow_metabox','toplevel_page_cyberautopieces','normal','high');
add_meta_box('save_box','Enregistrer','save_metabox','toplevel_page_cyberautopieces','side','high');
}
//Define the insides of the metabox
function slideshow_metabox(){
var_dump(get_option('slide')); // DISPLAY bool(false) :(
?>
<ul id="slideshow_box">
<li>
<a class="add-image-slider" href="#">
<div class="images half">
Choisir une image
<img src="" alt="">
<input type="hidden" name="slide[img][]">
</div>
</a>
<div class="text half">
<label><strong>Titre : </strong></label>
<input type="text" name="slide[title][]" value="" />
<label><strong>Slogan : </strong></label>
<input type="text" name="slide[slogan][]" value="" />
<strong>Situation : </strong>
<select id="slide_situation" name="slide[text_position][]">
<option value="left" selected>Gauche</option>
<option value="right">Droite</option>
</select>
</div>
<div class="add-delete">
<span class="add">+</span><span class="delete">-</span>
</div>
</li>
</ul>
<?php
}
//Define the insides of the metabox
function save_metabox(){
submit_button();
}
Here are the contents of my class GeneratePageAdmin :
class GeneratePageAdmin
{
var $hook;
var $title;
var $menu;
var $permissions;
var $slug;
var $page;
/**
* Constructor class for the Simple Admin Metabox
*#param $hook - (string) parent page hook
*#param $title - (string) the browser window title of the page
*#param $menu - (string) the page title as it appears in the menuk
*#param $permissions - (string) the capability a user requires to see the page
*#param $slug - (string) a slug identifier for this page
*#param $body_content_cb - (callback) (optional) a callback that prints to the page, above the metaboxes. See the tutorial for more details.
*/
function __construct($hook, $title, $menu, $permissions, $slug, $body_content_cb='__return_true'){
$this->hook = $hook;
$this->title = $title;
$this->menu = $menu;
$this->permissions = $permissions;
$this->slug = $slug;
$this->body_content_cb = $body_content_cb;
/* Add the page */
add_action('admin_menu', array($this,'add_page'));
}
/**
* Adds the custom page.
* Adds callbacks to the load-* and admin_footer-* hooks
*/
function add_page(){
/* Add the page */
$this->page = add_submenu_page($this->hook,$this->title, $this->menu, $this->permissions,$this->slug, array($this,'render_page'),10);
//var_dump($this->page);
/* Add callbacks for this screen only */
add_action('load-'.$this->page, array($this,'page_actions'),9);
add_action('admin_footer-'.$this->page,array($this,'footer_scripts'));
}
/**
* Prints the jQuery script to initiliase the metaboxes
* Called on admin_footer-*
*/
function footer_scripts(){
?>
<script> postboxes.add_postbox_toggles(pagenow);</script>
<?php
}
/*
* Actions to be taken prior to page loading. This is after headers have been set.
* call on load-$hook
* This calls the add_meta_boxes hooks, adds screen options and enqueues the postbox.js script.
*/
function page_actions(){
do_action('add_meta_boxes_'.$this->page, null);
do_action('add_meta_boxes', $this->page, null);
/* User can choose between 1 or 2 columns (default 2) */
add_screen_option('layout_columns', array('max' => 2, 'default' => 2) );
/* Enqueue WordPress' script for handling the metaboxes */
wp_enqueue_script('postbox');
}
/**
* Renders the page
*/
function render_page(){
?>
<div class="wrap" id="<?php echo $this->slug; ?>">
<?php screen_icon(); ?>
<h2> <?php echo esc_html($this->title);?> </h2>
<form method="post">
<?php settings_fields( $this->slug.'-settings' ); ?>
<?php do_settings_sections( $this->slug.'-settings' ); ?>
<input type="hidden" name="action" value="some-action">
<?php wp_nonce_field( 'some-action-nonce' );
/* Used to save closed metaboxes and their order */
wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false ); ?>
<div id="poststuff">
<div id="post-body" class="metabox-holder columns-<?php echo 1 == get_current_screen()->get_columns() ? '1' : '2'; ?>">
<div id="post-body-content">
<?php call_user_func($this->body_content_cb); ?>
</div>
<div id="postbox-container-1" class="postbox-container">
<?php do_meta_boxes('','side',null); ?>
</div>
<div id="postbox-container-2" class="postbox-container">
<?php do_meta_boxes('','normal',null); ?>
<?php do_meta_boxes('','advanced',null); ?>
</div>
</div> <!-- #post-body -->
</div> <!-- #poststuff -->
</form>
</div><!-- .wrap -->
<?php
}
}
Sorry for the long code , but I really do not know where the problem is.
Thanks you for your help ;-)

Answer 1

I'd say the problem lies within the way you're instantiating your class.
Use a hook to instantiate it like:
add_action( 'after_setup_theme', array( 'GeneratePageAdmin', 'init' ) );
Create the new method init of course, and do your work there.
If you're creating an options page, then the hook is likely an admin one, and not after_setup_theme, but you should get the idea.
What I would do is something like this:
public static function get_instance() {
// create an object
NULL === self::$instance and self::$instance = new self;
// return the object
return self::$instance;
}
Then, to instantiate it via Wordpress hook:
add_action( 'after_setup_theme', array( GeneratePageAdmin::get_instance(), 'init' ) );
Then, you should be able to use $this in your class

Answer 2

Finally, I've just had to add "action=options.php" in the header of the form and remove this section automatically handled by the settings_fields function.
<input type="hidden" name="action" value="some-action">
<?php wp_nonce_field( 'some-action-nonce' ); ?>