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jquery ajax 获取数据 转换成 Json

2011-08-04 14:46 561 查看
页面代码：

<head runat="server">
<title></title>
<script src="jquery-1.4.2.min.js" type="text/javascript"></script>
<script>
function Datas() {
//            var cardName = $("#zhanghu_name").val();
//            var cardCreatedOn = $("#startDt").val();
$.ajax({

type: "post", //提交方式
cache: false,
url: "Handler1.ashx",         //提交地址
dataType: "json",
// data: "name=" + cardName + "&date=" + cardCreatedOn, //提交的数据
//data: "name=伊牛娃&date=2009-05-20",//如果只需要传固定值的话，可以直接这样写
success: function (msg) {//根据返回状态，给出相关提示

$("#TextBox1").val(msg.tble[0].Quotation_No);
for (var i = 0; i < msg.tble.length; i++) {
alert(msg.tble[i].Quotation_No)
}

}
});
}

</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1"   OnClientClick="Datas();return false;" runat="server" Text="Button" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</div>
</form>
</body>
</html>


处理页面：Handler1.ashx

public class Handler1 : IHttpHandler
{

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string json = "";
DataTable tblDatas = new DataTable("Datas");
tblDatas.Columns.Add("Quotation_No", Type.GetType("System.String"));
tblDatas.Columns.Add("Cust_PN", Type.GetType("System.String"));
tblDatas.Columns.Add("Factory_No", Type.GetType("System.String"));
tblDatas.Rows.Add(new object[] { "Q11053 ", "BB96168-1A04", "4100" });
tblDatas.Rows.Add(new object[] { "Q110531001", "BB96168-1A04", "4100" });
json=  DataTableConvertJson.DataTableToJson("tble", tblDatas);

context.Response.Write(json);
}

public bool IsReusable
{
get
{
return false;
}
}
}


转换成 json格式：DataTableConvertJson.cs

public class DataTableConvertJson
{

#region dataTable转换成Json格式
/// <summary>
/// dataTable转换成Json格式
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string DataTable2Json(DataTable dt)
{
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.Append("{\"");
jsonBuilder.Append(dt.TableName);
jsonBuilder.Append("\":[");
jsonBuilder.Append("[");
for (int i = 0; i < dt.Rows.Count; i++)
{
jsonBuilder.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
jsonBuilder.Append("\"");
jsonBuilder.Append(dt.Columns[j].ColumnName);
jsonBuilder.Append("\":\"");
jsonBuilder.Append(dt.Rows[i][j].ToString());
jsonBuilder.Append("\",");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("},");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("]");
jsonBuilder.Append("}");
return jsonBuilder.ToString();
}

#endregion dataTable转换成Json格式
#region DataSet转换成Json格式
/// <summary>
/// DataSet转换成Json格式
/// </summary>
/// <param name="ds">DataSet</param>
/// <returns></returns>
public static string Dataset2Json(DataSet ds)
{
StringBuilder json = new StringBuilder();

foreach (DataTable dt in ds.Tables)
{
json.Append("{\"");
json.Append(dt.TableName);
json.Append("\":");
json.Append(DataTable2Json(dt));
json.Append("}");
} return json.ToString();
}
#endregion

/// <summary>
/// Msdn
/// </summary>
/// <param name="jsonName"></param>
/// <param name="dt"></param>
/// <returns></returns>
public static string DataTableToJson(string jsonName, DataTable dt)
{
StringBuilder Json = new StringBuilder();
Json.Append("{\"" + jsonName + "\":[");
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
Json.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + dt.Rows[i][j].ToString() + "\"");
if (j < dt.Columns.Count - 1)
{
Json.Append(",");
}
}
Json.Append("}");
if (i < dt.Rows.Count - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}
}
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