jQuery('#button').click( function () {

     var vocabulary = jQuery('.selected').children("input").attr("id");
     var user = jQuery('#id_user').attr("name");

        jQuery.ajax({
        url: removeVoca.ajax_url,
        type:'post',
        data : {
            action : 'renove_vocabulary',
            id_vocabulary : vocabulary,
            id_user : user
        },
        success : function(reponse){

          //delete the row
          table.row('.selected').remove().draw( false );
        },
        error: function(xhr){
           //error handling
           console.log("suppression echoué")
        }});

    } );
} );

add_action( 'wp_ajax_renove_vocabulary', 'renove_vocabulary' );

function renove_vocabulary() {

$id_user = $_POST['user_id'];
$id_vacabulary = $_POST['vocabulary_id'];


global $wpdb;

$reponse = $wpdb-> delete ('wp_user_vocabulary', array ('vocabulary_id' => $id_vacabulary , 'user_id' => $id_user ), array('%d', '%d'));


wp_die();

}