Possible to add meta box to edit.php pages?

Question

I've been googling this for a while, and came across this link here: Can I limit this meta box to a particular page?

What I am trying to achieve is adding a custom Meta Boxe I created onto a CPT Posts Screen (edit.php?post_type=custom).

What I tried to use is this:

add_action("admin_init", "admin_init");
function admin_init() {
   global $pagenow, $page;
      if ( 'edit.php' == $pagenow ) {
         add_meta_box( $id, $title, $callback, $post_type, $context, $priority, $callback_args );
      }
}

When adding and saving this into my functions.php, the page turns blank.

Is it even possible to add a meta box to edit.php pages?

---

EDIT OP wants to add the "QuickPress" functionality in this meta box. Screenshots from the comments to an answer.

Answer 1

From your comment, it sounds like you don't want a metabox. A metabox is used to add metadata to a particular post, not create a new post from scratch. What it sounds like you want to do is create a widget to do what you want and then invoke it through an action or filter at the top/bottom of the page. You can use the existing Quick Post dashboard widget as your base.

Answer 2

Update - So I am able to reload the page after the post is saved, but I know it is a bit "hacky". Basically, when you submit a QP post, the form renders to display a "update" message.

What I did was added a Jquery function to reload the page whenever "#dashboard_quick_press .updated" is shown.

Once finished I can also upload the new code I wrote if anyone would like. Feel free to chime in if there is a better solution (which I know there definitely is). Hopefully we both can make it better. If it's okay, I rather finish the coding before I mark as answered. Thanks!

<script type="text/javascript">
   jQuery(function($)  {
      $("#dashboard_quick_press .updated").each( function() {
         location.reload();
      });
   });
</script>

__

New JS to refresh the wp-list-table instead of reloading entire page:

<script type="text/javascript">
   jQuery(function($)  {
      $("#dashboard_quick_press .updated").each( function() {
         $("#posts-filter").load('/supreme/wp-admin/edit.php #posts-filter'); 
         return false;
      });
   });
</script>

Answer 3

Try this

PHP

function quickPressBox() {
    echo '<div id="quick_press_box">content....</div>';
}
add_action('admin_footer', 'quickPressBox');

JQUERY

<script type="text/javascript">
   jQuery(function($)  {

      $("#quick_press_box").appendTo(".wrap");

   });
</script>

Answer 4

Please consider this code:

global $pagenow, $page;
if ( 'edit.php' = $pagenow && '123' == $post->ID ) {
    add_meta_box( $args );
}