Is there a hook between clicking on "Add new" and the edit screen of a new post?

Question

At the moment i use 3 custom post types to create "exhibitions", "guided tours" and "regular events".

My idea is to combine these events to one custom post type "event" and by creating of this custom post type there should be a pop-up option page where i can choose which type of event it should be.

I really do not want to do it later on the edit screen of the post because i would like to adjust the edit screen for every event type and display it prepared.

So i need some kind of hook/break after clicking on the "Add New" button and displaying the edit screen. Is it possible?

Answer 1

This plugin does the same thing as what you are looking for: http://wordpress.org/extend/plugins/magic-action-box

It has a custom post type called action-box but has different types of action boxes that you can select when you create a new action box. The code you want is found inside the plugin's directory lib/classes/ProsulumMabAdmin.php.

Look for the method add_actions() and at the very end you should find something like this:

    /**
     * Hacky part followed from Premise. This is to make sure people
     * select an Action Box type before an Action Box type is actually created.
     * Requirements as of WP3.3: Custom post type needs to have support for comments
     * for this hack to work
     */
    add_action('admin_notices', array( &$this, 'possiblyStartOutputBuffering' ) );
    add_filter('wp_comment_reply', array( &$this, 'possiblyEndOutputBUffering' ) );

Follow the code - or just copy it and mod as needed, that's what open source all about :) - and you should be able to create your popup option page to select the type of event.

But, you also need to catch the selection of event type. For how Magic Action Box does it, again look at the method add_actions() and look for

add_action( 'admin_init', array(&$this, 'processSubmissions' ) );

follow the code and you'll find a section within the processSubmissions() method that processes the selection of an action box type.