Ajax not working wordpress

js file:

  jQuery.ajax
  ({
        url: '<?php echo admin_url("admin-ajax.php"); ?>',
        type: 'POST',
        data: {
          'action':'myaction'
        },
        success: function(data)
        {
            alert('Happy new year 2015 :) ');
        },
        error: function(data)
        {
            alert( 'Sorry! No Happy New year 2015 :(' );
        }
  });

php file:

// Ajax Handler.
function so_enqueue_scripts()
{
  $plugin_dir_path = dirname(__FILE__);
  $plugin_url = plugins_url();
  wp_enqueue_script( 'ajaxHandle', $plugin_url . '/walking-log/js/walking_log.js', array('jQuery') );
  wp_localize_script( 'ajaxHandle', 'myAjax', array( 'ajaxurl' => admin_url( 'admin_ajax.php' ) ) );

  add_action( 'wp_ajax_myaction', 'so_wp_ajax_function' );
  add_action( 'wp_ajax_nopriv_myaction', 'so_wp_ajax_function' );
}
add_action( 'init', 'so_enqueue_scripts' );

function so_wp_ajax_function()
{
    die();
}

path of walking-log.js is right, i have opened in the browser. I am getting the success failure alert. don't know why. any help would be appreciated.