Why do I lose the content of meta boxes when I leave the page?

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So I’ve been coding a theme and I’m working on a custom post type. When I edit a custom post and save the changes (click Update) everything is ok.

But – I noticed that when I leave the Edit page open for a while and come back to it a few minutes later and try to refresh, that dialog “Stay On Page/Leave Page” pops up and if I choose “leave page” all of the content from the custom meta boxes is lost. Only the title remains.

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I’m guessing this has something to do with the way that I’m saving the data from the custom meta boxes, so here it is: 

add_action('admin_init', 'init_portfolio_meta_boxes');

function init_portfolio_meta_boxes() {
    add_meta_box('short_description', 'Short Description', 'short_description_meta', 'portfolio', 'normal');
}

function short_description_meta() {
    global $post;
    $custom = get_post_custom($post->ID);
    $short_description = $custom['short_description'][0];
    ?>
        <textarea name="short_description" style="width: 200px; height: 100px;"><?php echo $short_description; ?></textarea>
    <?php
}

add_action('save_post', 'save_details');
function save_details() {
    global $post;
    update_post_meta($post->ID, 'short_description', $_POST['short_description']);
}

That’s the entire code for one of the meta boxes, I followed a tutorial to get to it.

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1 comment

  1. This is because save_details is not checking if its an autosave routine:

    add_action('save_post', 'save_details');
function save_details() {
    global $post;
    // verify this is not an auto save routine. 
    if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) return;
    update_post_meta($post->ID, 'short_description', $_POST['short_description']);
}