WP Metabox not saving post meta - php

Question

i am trying to implement a simple checkbox on the page, in order to dynamically add a Html chunk in case the user choses it, but i am unable to save the post_meta to perform this task, can someone help me? The value taken from this checkbox input is not been save on the post meta information.
This is what i got so far on my functions.php
function wporg_add_custom_box(){
$screens = ['page', 'wporg_cpt'];
foreach ($screens as $screen) {
add_meta_box(
'wporg_box_id', // Unique ID
'Entra in Flee Block', // Box title
'wporg_custom_box_html', // Content callback, must be of type callable
$screen, // Post type
'side'
);
}
}
add_action('add_meta_boxes', 'wporg_add_custom_box');
function wporg_custom_box_html($post){
$value = get_post_meta($post->ID, '_wporg_meta_key', true);
?>
<label for="wporg_field">Add "Entra in Flee" block to page</label>
</br>
<input type="checkbox" name="wporg_field" id="wporg_field" class="postbox">
<?php
}
function wporg_save_postdata($post_id){
if (array_key_exists('wporg_field', $_POST)) {
update_post_meta(
$post_id,
'_wporg_meta_key',
$_POST['wporg_field']
);
}
}
add_action('save_post', 'wporg_save_postdata');

Answer 1

You don't use the $value on wp_cusotm_box_html function.
I think it should be somthing like this:
function wporg_add_custom_box()
{
$screens = ['page', 'wporg_cpt'];
foreach ($screens as $screen) {
add_meta_box(
'wporg_box_id', // Unique ID
'Entra in Flee Block', // Box title
'wporg_custom_box_html', // Content callback, must be of type callable
$screen, // Post type
'side'
);
}
}
add_action('add_meta_boxes', 'wporg_add_custom_box');
function wporg_custom_box_html($post)
{
$value = get_post_meta($post->ID, '_wporg_meta_key', true) ? 'checked' : '';
?>
<label for="wporg_field">Add "Entra in Flee" block to page</label>
</br>
<input type="checkbox" name="wporg_field" id="wporg_field" class="postbox" <?php echo $value; ?>>
<?php
}
function wporg_save_postdata($post_id)
{
if (array_key_exists('wporg_field', $_POST)) {
update_post_meta(
$post_id,
'_wporg_meta_key',
$_POST['wporg_field']
);
} else {
delete_post_meta(
$post_id,
'_wporg_meta_key'
);
}
}
add_action('save_post', 'wporg_save_postdata');