application.js

$(document).ready(function() {

  $('.async').live('click', function() {
    var current = $(this).text();
    if ( current == 'show' ) {
      $(this).text('hide');
    } else if (current == 'hide') {
      $(this).text('show');
    }
    $.getJSON($(this).attr('href'),
      function(data) {
        message = "<div class='flash notice'>" + data.message + "</div>";
        $('#result').html(message);
      }
    );
    return false;
  });
});

$(document).ready(function() {

  $('.search').live('change', function() {
    var txt = $(this).text();

    $.getJSON('/sheet_musics/search/'), 
      function(data) {
        $('#result').html(data.result);
      }
    );
    return false;
  });
});