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C # client callback data code

Source: Internet
Author: User
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  1. <% @ Page Language = "C #" AutoEventWireup = "true"
  2. CodeFile = "ClientCallback. aspx. cs" Inherits = "ClientCallback" %>
  4. <! DOCTYPE html PUBLIC "-// W3C // DTD XHTML
  5. 1.1 // EN "" http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd ">
  7. <Html>
  8. <Head id = "Head1" runat = "server">
  9. <Title> Client Callback Example </title>
  10. <Script type = "text/ecmascript">
  11. Function LookUpStock ()
  12. {
  13. Var lb = document. getElementById ("ListBox1 ");
  14. Var product = lb. options [lb. selectedIndex]. text;
  15. CallServer (product ,"");
  16. }
  18. Function compute eserverdata (rValue)
  19. {
  20. Document. getElementById ("ResultsSpan"). innerHTML = rValue;
  22. }
  23. </Script>
  24. </Head>
  25. <Body>
  26. <Form id = "form1" runat = "server">
  27. <Div>
  28. <Asp: ListBox ID = "ListBox1" Runat = "server"> </asp: ListBox>
  29. <Br/>
  30. <Br/>
  31. <Button type = "Button" onclick = "LookUpStock ()"> Look Up Stock </button>
  32. <Br/>
  33. <Br/>
  34. Items in stock: <span id = "ResultsSpan" runat = "server"> </span>
  35. <Br/>
  36. </Div>
  37. </Form>
  38. </Body>
  39. </Html>
  40. Using System;
  41. Using System. Data;
  42. Using System. Configuration;
  43. Using System. Collections;
  44. Using System. Web;
  45. Using System. Web. Security;
  46. Using System. Web. UI;
  47. Using System. Web. UI. WebControls;
  48. Using System. Web. UI. WebControls. WebParts;
  49. Using System. Web. UI. HtmlControls;
  51. Public partial class ClientCallback: System. Web. UI. Page,
  52. System. Web. UI. ICallbackEventHandler
  53. {
  54. Protected System. Collections. Specialized. ListDictionary catalog;
  55. Protected String returnValue;
  56. Protected void Page_Load (object sender, EventArgs e)
  57. {
  58. String cbReference =
  59. Page. ClientScript. GetCallbackEventReference (this,
  60. "Arg", "ReceiveServerData", "context ");
  61. String callbackScript;
  62. CallbackScript = "function CallServer (arg, context )"
  63. "{" CbReference ";}";
  64. Page. ClientScript. RegisterClientScriptBlock (this. GetType (),
  65. "CallServer", callbackScript, true );
  67. Catalog = new System. Collections. Specialized. ListDictionary ();
  68. Catalog. Add ("monitor", 12 );
  69. Catalog. Add ("laptop", 10 );
  70. Catalog. Add ("keyboard", 23 );
  71. Catalog. Add ("mouse", 17 );
  73. ListBox1.DataSource = catalog;
  74. ListBox1.DataTextField = "key ";
  75. ListBox1.DataBind ();
  77. }
  79. Public void RaiseCallbackEvent (String eventArgument)
  80. {
  81. If (catalog [eventArgument] = null)
  82. {
  83. ReturnValue = "-1 ";
  84. }
  85. Else
  86. {
  87. ReturnValue = catalog [eventArgument]. ToString ();
  88. }
  89. }
  90. Public String GetCallbackResult ()
  91. {
  92. Return returnValue;
  93. }
  94. }

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