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I am writing a plugin in which I have a js file. I enqueue it with wp_enqueue_script. In this file I have some functions. The functions are triggered by an onclick event of a button. The button is located on edit post page. Now I need those functions to get post meta of the edited post, modify and save.

Does anyone have any idea how to do it?

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You can send variables to your script with wp_localize_script:

wp_enqueue_script( 'some_handle' );

global $post;
$my_meta = get_post_meta( $post->ID, 'my_meta', true );

$array = array( 
    'my_meta' => $my_meta

wp_localize_script( 'some_handle', 'object_name', $array );

You can then use the var in your script like:

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Might want to check is_singular first before using the global post object, or it won't work like you expect. Also, get_queried_object_id: $meta = get_post_meta(get_queried_object_id(), 'my_meta', true);. No need for global $post. – chrisguitarguy Jan 18 '13 at 20:46
This is a very good idea, but I need then to modify the variable in js file and update it. Any idea how? – HoGo Jan 18 '13 at 20:54
AJAX. – chrisguitarguy Jan 18 '13 at 20:59
You are probably right, but I am js newbe so an example would be useful. – HoGo Jan 18 '13 at 21:03

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