Ruby on rails RailsaToComplete.select not working when option is selected when not working when option is selected through down arrow

我正在使用rails3 jquery autocomplete来实现自动完成功能，但当我通过鼠标选择时，自动完成会起作用，但如果我通过键盘向下和箭头选择，然后单击“输入”按钮，则它不起作用，我会收到以下代码。我错过了什么

  $(".text_field_title").live("focusout",function(){
    var name = $(this).attr("name");
    var value = $(this).val();
    var activity_id = $(this).attr("rel")
    var practice_plan_id = $(this).attr('practice_plan_id');

    $("#"+activity_id+"_title").bind('railsAutocomplete.select',function(event,data){
      var data = [
        {
          name : name,
          value : value
        },
        {
          name : "activity_id",
          value : activity_id
        },
        {
          name :"fav_id",
          value : data.item.id
        }
      ];

      $.ajax({
        type: 'POST',
        url: 'myurl',
        data: data,
        dataType: "script"
      });

    });
});