将JSON解析为Object的Array属性

时间:2013-08-26 18:36:43

标签: c# jquery asp.net ajax

目前我有一个AJAX请求,它将运行以下SQL语句。

select top 1     
         DrugQuestionId
        ,DrugId
        ,DrugQuestion as DrugQuizquestion
        ,CorrectAnswer
        ,QuizQuestionTypeId
from DrugQuestions

并返回一个drugQuestion对象,其中包含SQL Server表中列出的属性。

相关的JS:

$(document).ready(function ()
        {
            $('#btnSubmit').click(function ()
            {
                $.ajax(
                {
                    type: "POST",
                    url: "GetDrugQuiz.asmx/GenerateDrugQuestion",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (data)
                    {
                        var drugQuestion = $.parseJSON(data.d);
                        //everything prints to the console correctly
                        console.log(drugQuestion.DrugQuestionId); //5 in this example
                        console.log(drugQuestion.DrugId);
                        console.log(drugQuestion.DrugQuizQuestion);
                        console.log(drugQuestion.CorrectAnswer);
                        console.log(drugQuestion.QuizQuestionTypeId);


                    },
                    error: function (xhr)
                    {
                        alert(xhr.status);
                    }

                });
            });
        });

这很好用,给了我正在寻找的答案。实际上,我需要一个drugQuiz对象,它有一个属性是drugQuestion个对象的数组。我使用以下WebMethod来尝试:

//this is questions, plural mean to populate an array with a length equal to the row count
//of the query
     public string GenerateDrugQuestions()
            {
                var jss = new JavaScriptSerializer();
                DrugQuiz qz = new DrugQuiz();
                qz.PatientId = 123;
                qz.DateTaken = DateTime.Now;
                qz.DrugQuizId = 1;
                string cs = ConfigurationManager.ConnectionStrings["dbcs"].ConnectionString;
                using (var con = new SqlConnection(cs))
                {
                    using (var cmd = new SqlCommand("select top 3 * from DrugQuestions", con))
                    {
                        con.Open();

                        SqlDataReader rdr = cmd.ExecuteReader();
                        while (rdr.Read())
                        {
                            DrugQuestion dq = new DrugQuestion();
                            dq.DrugQuestionId = (int)rdr["DrugQuestionId"];
                            dq.DrugId = (int)rdr["DrugId"];
                            dq.DrugQuizQuestion = rdr["DrugQuestion"].ToString();
                            dq.CorrectAnswer = rdr["CorrectAnswer"].ToString();
                            dq.QuizQuestionTypeId = (int)rdr["QuizQuestionTypeId"];
                            qz.DrugQuestions.Add(dq);
                        }
                        return jss.Serialize(qz);
                    }
                }
            }

所以你可以看到从WebMethod返回一个JSON字符串。当我使用WebMethod而没有实际访问页面并点击Invoke时,我得到了正确的字符串。我无法弄清楚的是如何填充drugQuestions数组,这是drugQuiz对象的属性。我需要更改以下代码才能实现这一目标?

$(document).ready(function ()
        {
            var drugQuiz = {};
            drugQuiz.drugQuestions = new Array();
            $('#btnSubmit').click(function ()
            {
                $.ajax(
                {
                    type: "POST",
                    url: "GetDrugQuiz.asmx/GenerateDrugQuestions",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (data)
                    {
                        drugQuiz.drugQuestions.push($.parseJSON(data.d));
                        console.log(drugQuiz.drugQuestions.length);
                        console.log(drugQuiz.drugQuestions);

                    },
                    error: function (xhr)
                    {
                        alert(xhr.status);
                    }

                });
            });
        });

我需要能够做类似警报的事情(drugQuiz.drugQuestions [0] .DrugId);

1 个答案:

答案 0 :(得分:3)

循环返回的JSON并将每个项目推送到JavaScript数组中,如下所示:

success: function (data) {
    $.each(data.d, function(i, item) {
        drugQuiz.drugQuestions.push(item);
    });
},

如果您想使用parseJSON()执行此操作,请尝试以下操作:

success: function (data) {
    var jsonData = JSON.parse(data.d);
    for (var i in jsonData.drugQuestions) {
        var question = jsonData.drugQuestions[i];
    }
},

注意:我不确定JSON对象的名称,我猜测drugQuestions是传回的drugQuestion个对象数组的名称,如果不是,则更改jsonData.值以匹配您返回的JSON的结构。