wordpress json custom walker example

gistfile1.txt

<?php

    class Walker_Json extends Walker {

        // Tell Walker where to inherit it's parent and id values
        var $db_fields = array(
            'parent' => 'menu_item_parent',
            'id'     => 'db_id'
        );

        /**
         * At the start of each element, output a <li> and <a> tag structure.
         *
         * Note: Menu objects include url and title properties, so we will use those.
         */
        function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
           $returnItem = array(
                 "item" => $item
           );
           echo json_encode($returnItem) . ",";
        }

    }

    ?>



<script>
            <?php // BEGIN WORDPRESS NAVIGATION //?>
                var jsonMenu = [<?php
                wp_nav_menu(array(
                    'name' => 'Main',
                    'container' => false,
                    'walker' => new Walker_Json()
                ));
                ?>]
             <?php // END WORDPRESS NAVIGATION //?>
</script>