aspx:
在前台页面中引用jquery，那个版本的都行
<script src="../JS/jquery-1.7.2.js" type="text/javascript"></script>
加入一个按钮
<input type="button" value="button" id="btn"/>
在前台页面中引用jquery，那个版本的都行
<script src="../JS/jquery-1.7.2.js" type="text/javascript"></script>
加入一个按钮
<input type="button" value="button" id="btn"/>
js 文件如下
$(document).ready(function () {
$.ajax({
url: '../Handler.ashx?action=GetProvince', //url action是方法的名称
data: {id:"11"},//参数
type: 'POST',
dataType: "text",//可以是text，如果用text，返回的结果为字符串；如果需要json格式的，可是设置为json
ContentType: "application/json; charset=utf-8",
success: function (data) {
alert(data);
var obj = eval("(" + data + ")");//将字符串转为json
alert(obj);
alert(obj.T_blog[0].name);
},
error: function (msg) {
alert("失败");
}
});
});
});
Handler.ashx 文件如下：
<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Data;
using System.Text;
using System.Web;
public class Handler : IHttpHandler {
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string method = context.Request["action"];//action
switch (method)
{
case "GetProvince":
{
string a = context.Request.Params["id"];//前台传过来的参数为id
context.Response.Write(GetProvince());
break;
}
default:
break;
}
}
public bool IsReusable {
get {
return false;
}
}
/// <summary>
/// 前台需要调用的方法
/// </summary>
/// <returns></returns>
public string GetProvince()
{
//TreeViewCommon treeViewCommon= new TreeViewCommon();
//return treeViewCommon.GetProvince();
return CreateJsonParameters(GetTable());
}
/// <summary>
/// DataTable
/// </summary>
/// <returns></returns>
public DataTable GetTable()
{
DataTable dt = new DataTable();
dt.Columns.AddRange(new DataColumn[]
{
new DataColumn("name",Type.GetType("System.String")),
new DataColumn("age",Type.GetType("System.Int32"))
});
DataRow dr;
dr = dt.NewRow();
dr["name"] = "zhangsan";
dr["age"] = 10;
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["name"] = "lisi";
dr["age"] = 15;
dt.Rows.Add(dr);
return dt;
}
/// <summary>
/// DataTable 转 Json
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string CreateJsonParameters(DataTable dt)
{
/**/
/**/
/**/
/* /****************************************************************************
* Without goingin to the depth of the functioning of this Method, i will try to give an overview
* As soon as this method gets a DataTable it starts to convert it into JSON String,
* it takes each row and in each row it grabs the cell name and its data.
* This kind of JSON is very usefull when developer have to have Column name of the .
* Values Can be Access on clien in this way. OBJ.HEAD[0].<ColumnName>
* NOTE: One negative point. by this method user will not be able to call any cell by its index.
* *************************************************************************/
StringBuilder JsonString = new StringBuilder();
//Exception Handling
if (dt != null && dt.Rows.Count > 0)
{
JsonString.Append("{ ");
JsonString.Append("\"T_blog\":[ ");
for (int i = 0; i < dt.Rows.Count; i++)
{
JsonString.Append("{ ");
for (int j = 0; j < dt.Columns.Count; j++)
{
if (j < dt.Columns.Count - 1)
{
JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\",");
}
else if (j == dt.Columns.Count - 1)
{
JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\"");
}
}
/**/
/**/
/**/
/*end Of String*/
if (i == dt.Rows.Count - 1)
{
JsonString.Append("} ");
}
else
{
JsonString.Append("}, ");
}
}
JsonString.Append("]}");
return JsonString.ToString();
}
else
{
return null;
}
}
}