转载：Ajax 实现在WebForm中拖动控件并即时在服务端保存状态数据 (Asp.net 2.0)(示例代码下载)
原文：http://blog.csdn.net/ChengKing/archive/2006/08/30/1142605.aspx
(一) . 运行示例效果
* 运行后用鼠标拖动蓝色的<马>到任意位置, 将浏览器关闭后, 再重新访问本页面, 会发现<马>仍然在您拖到的位置
(二). AjaxPro.NET简介
首先对AjaxPro.NET作一下介绍, AjaxPro.NET是一个优秀的Ajax框架, 在实际应用中只要添加其DLL
引用并进行简单的配置, 即可以非常方便的在客户端直接调用服务端方法, 来获取Tree节点.
(三).使用AjaxPro.NET预配置
1. 添加 AjaxPro.dll 文件的引用(示例代码中已经包含,直接COPY过来使用即可).
2. 在Web.config文件中添加以下配置,
1 <httpHandlers>
2 <add verb="POST,GET" path="ajaxpro/*.ashx" type="AjaxPro.AjaxHandlerFactory, AjaxPro" />
3 </httpHandlers>
2 <add verb="POST,GET" path="ajaxpro/*.ashx" type="AjaxPro.AjaxHandlerFactory, AjaxPro" />
3 </httpHandlers>
3. 在要使用AjaxPro.NET框架的页面 *.aspx.cs 的 Page_Load事件中加如下代码:
AjaxPro.Utility.RegisterTypeForAjax(typeof(_Default));
4. 经过以上三步骤后, 只要在后台服务端的方法前面增加属性[AjaxMethod]后:
1 [AjaxMethod()] // or [AjaxPro.AjaxMethod]
2 public ArrayList GetSearchItems( string strQuery )
3 {
4 //生成数据源
5 ArrayList items = new ArrayList();
6 items.Add("King");
7 items.Add("Rose");
8 return items ;
9 }
10
2 public ArrayList GetSearchItems( string strQuery )
3 {
4 //生成数据源
5 ArrayList items = new ArrayList();
6 items.Add("King");
7 items.Add("Rose");
8 return items ;
9 }
10
就可以在客户端直接使用服务端方法, 非常方便, 客户端调用后台代码如下:
var returnValue = 后台代码类名.GetSearchItems(参数);(四). 代码
1. 页面前台文件 AjaxDrag.aspx 代码如下:
1 <head runat="server">
2 <title>Drag controls</title>
3 <script language="javascript" src="dom-drag.js"></script>
4 </head>
5 <body onload="javascript:ReadPosition();">
6 <form id="form1" runat="server">
7 <div>
8 <table style="width: 839px; height: 550px"
9 background="http://blog.csdn.net/images/blog_csdn_net/chengking/XiangQi.JPG">
10 <tr>
11 <td style="width: 3px; height: 394px;" align="left" atomicselection="false" valign="top"
12 background="http://blog.csdn.net/images/blog_csdn_net/chengking/XiangQi.JPG">
13 <asp:Image ID="Image1" runat="server" ImageAlign="Middle" ImageUrl="~/blue-ma.gif"
14 style="cursor:hand;position:absolute;display:none" />
15 </td>
16 </tr>
17 </table>
18 </div>
19 </form>
20 <script language="javascript">
21 var Image1 = document.getElementById("Image1");
22 Drag.init(Image1);
23 Image1.onDragEnd = function(x, y)
24 {
25 WritePosition(x, y);
26 }
27
28 function WritePosition(x,y)
29 {
30 _Default.WritePosition(x, y);
31 }
32
33 function ReadPosition()
34 {
35 window.setTimeout("_Default.ReadPosition(ReadPosition_callback)",600)
36 }
37
38 function ReadPosition_callback(response)
39 {
40 var value = response.value;
41 Image1.style.left = value.X;
42 Image1.style.top = value.Y;
43 Image1.style.display = '';
44 }
45 </script>
46 </body>
2 <title>Drag controls</title>
3 <script language="javascript" src="dom-drag.js"></script>
4 </head>
5 <body onload="javascript:ReadPosition();">
6 <form id="form1" runat="server">
7 <div>
8 <table style="width: 839px; height: 550px"
9 background="http://blog.csdn.net/images/blog_csdn_net/chengking/XiangQi.JPG">
10 <tr>
11 <td style="width: 3px; height: 394px;" align="left" atomicselection="false" valign="top"
12 background="http://blog.csdn.net/images/blog_csdn_net/chengking/XiangQi.JPG">
13 <asp:Image ID="Image1" runat="server" ImageAlign="Middle" ImageUrl="~/blue-ma.gif"
14 style="cursor:hand;position:absolute;display:none" />
15 </td>
16 </tr>
17 </table>
18 </div>
19 </form>
20 <script language="javascript">
21 var Image1 = document.getElementById("Image1");
22 Drag.init(Image1);
23 Image1.onDragEnd = function(x, y)
24 {
25 WritePosition(x, y);
26 }
27
28 function WritePosition(x,y)
29 {
30 _Default.WritePosition(x, y);
31 }
32
33 function ReadPosition()
34 {
35 window.setTimeout("_Default.ReadPosition(ReadPosition_callback)",600)
36 }
37
38 function ReadPosition_callback(response)
39 {
40 var value = response.value;
41 Image1.style.left = value.X;
42 Image1.style.top = value.Y;
43 Image1.style.display = '';
44 }
45 </script>
46 </body>
2. 页面后台文件 AjaxDrag.aspx.cs 代码如下:
1 public partial class _Default : System.Web.UI.Page
2 {
3 protected void Page_Load(object sender, EventArgs e)
4 {
5 Utility.RegisterTypeForAjax(typeof(_Default));
6 }
7
8 [AjaxPro.AjaxMethod]
9 public void WritePosition(int x, int y)
10 {
11 string strFileName = this.GetFileName();
12 if (File.Exists(strFileName))
13 {
14 StreamWriter sw = new StreamWriter(strFileName, false, System.Text.Encoding.UTF8);
15 sw.WriteLine(x.ToString() + "," + y.ToString());
16 sw.Flush();
17 sw.Close();
18 }
19 }
20
21 [AjaxPro.AjaxMethod]
22 public Point ReadPosition()
23 {
24 StreamReader sr = new StreamReader(this.GetFileName(), System.Text.Encoding.Default);
25 string str_X_Y = "";
26 while (sr.Peek() >= 0)
27 {
28 str_X_Y = sr.ReadLine();
29 break;
30 }
31 sr.Close();
32
33 string[] str_x_y = str_X_Y.Split(',');
34 Point p = new Point();
35 p.X = int.Parse(str_x_y[0]);
36 p.Y = int.Parse(str_x_y[1]);
37
38 return p;
39 }
40
41 private string GetFileName()
42 {
43 string rootCatoryName = "AjaxDragControl";
44 string strPath = Server.MapPath(".");
45 strPath = strPath.Substring(0, strPath.IndexOf(rootCatoryName) + rootCatoryName.Length);
46 string strFileName = Path.Combine(strPath, "save.txt");
47 return strFileName;
48 }
49 }
2 {
3 protected void Page_Load(object sender, EventArgs e)
4 {
5 Utility.RegisterTypeForAjax(typeof(_Default));
6 }
7
8 [AjaxPro.AjaxMethod]
9 public void WritePosition(int x, int y)
10 {
11 string strFileName = this.GetFileName();
12 if (File.Exists(strFileName))
13 {
14 StreamWriter sw = new StreamWriter(strFileName, false, System.Text.Encoding.UTF8);
15 sw.WriteLine(x.ToString() + "," + y.ToString());
16 sw.Flush();
17 sw.Close();
18 }
19 }
20
21 [AjaxPro.AjaxMethod]
22 public Point ReadPosition()
23 {
24 StreamReader sr = new StreamReader(this.GetFileName(), System.Text.Encoding.Default);
25 string str_X_Y = "";
26 while (sr.Peek() >= 0)
27 {
28 str_X_Y = sr.ReadLine();
29 break;
30 }
31 sr.Close();
32
33 string[] str_x_y = str_X_Y.Split(',');
34 Point p = new Point();
35 p.X = int.Parse(str_x_y[0]);
36 p.Y = int.Parse(str_x_y[1]);
37
38 return p;
39 }
40
41 private string GetFileName()
42 {
43 string rootCatoryName = "AjaxDragControl";
44 string strPath = Server.MapPath(".");
45 strPath = strPath.Substring(0, strPath.IndexOf(rootCatoryName) + rootCatoryName.Length);
46 string strFileName = Path.Combine(strPath, "save.txt");
47 return strFileName;
48 }
49 }
(五). 示例代码下载
