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jquery Asynchronous Call page Background instance analysis

Source: Internet
Author: User
Tags datetime eval getdate json return string
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The jquery call page background method is as follows:

Gives two simple examples, parameterless and parametric, and returns JSON data.

 
 
    
  
  
  1. 
  
  2. <%@ Page language= "C #" autoeventwireup= true "codebehind=" JqueryCSMethodForm.aspx.cs "inherits=" Jquerweb.jquerycsmethodform "%>
    3. 
  
  
  3. 
  
  4. <! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
    5. 
  
  
  5. 
  
  6. 
  
  
  7. 
  
  8. 
  
  
  9. 
  
  10. <title></title>
    11. 
  
  
  11. 
  
  12. <script type= "Text/javascript" src= "Js/jquery-1.4.2.js" ></script>
    13. 
  
  
  13. 
  
  14. 
  
  
  15. 
  
  16. <script type= "Text/javascript" >
    17. 
  
  
  17. 
  
  18. $ (document). Ready (function () {
    19. 
  
  
  19. 
  
  20. $ ("input[type= ' button '][value= ' GetDate ']"). Click (function () {
    21. 
  
  
  21. 
  
  22. $.ajax ({
    23. 
  
  
  23. 
  
  24. Type: "Post",
    25. 
  
  
  25. 
  
  26. URL: "Jquerycsmethodform.aspx/getnowdate",
    27. 
  
  
  27. 
  
  28. DataType: "JSON",
    29. 
  
  
  29. 
  
  30. ContentType: "Application/json; Charset=utf-8 ",
    31. 
  
  
  31. 
  
  32. Success:function (data) {
    33. 
  
  
  33. 
  
  34. $ ("Input#showtime"). Val (eval (' + DATA.D + ') ') [0].nowtime);
    35. 
  
  
  35. 
  
  36. },
    37. 
  
  
  37. 
  
  38. Error:function (XMLHttpRequest, Textstatus, Errorthrown) {
    39. 
  
  
  39. 
  
  40. alert (Errorthrown);
    41. 
  
  
  41. 
  
  42. }
    43. 
  
  
  43. 
  
  44. });
    45. 
  
  
  45. 
  
  46. });
    47. 
  
  
  47. 
  
  48. $ ("input[type= ' button '][value= ' Getonedaylater ']"). Click (function () {
    49. 
  
  
  49. 
  
  50. $.ajax ({
    51. 
  
  
  51. 
  
  52. Type: "Post",
    53. 
  
  
  53. 
  
  54. URL: "Jquerycsmethodform.aspx/getonedaylate",
    55. 
  
  
  55. 
  
  56. Data: "{days:1}",
    57. 
  
  
  57. 
  
  58. DataType: "JSON",
    59. 
  
  
  59. 
  
  60. ContentType: "Application/json; Charset=utf-8 ",
    61. 
  
  
  61. 
  
  62. Success:function (data) {
    63. 
  
  
  63. 
  
  64. $ ("Input#showtime"). Val (eval (' + DATA.D + ') ') [0].nowtime);
    65. 
  
  
  65. 
  
  66. },
    67. 
  
  
  67. 
  
  68. Error:function (XMLHttpRequest, Textstatus, Errorthrown) {
    69. 
  
  
  69. 
  
  70. alert (Errorthrown);
    71. 
  
  
  71. 
  
  72. }
    73. 
  
  
  73. 
  
  74. });
    75. 
  
  
  75. 
  
  76. });
    77. 
  
  
  77. 
  
  78. });
    79. 
  
  
  79. 
  
  80. 
  
  
  81. 
  
  82. </script>
    83. 
  
  
  83. 
  
  84. 
  
  
  85. 
  
  86. <body>
    87. 
  
  
  87. 
  
  88. <form id= "Form1" runat= "Server" >
    89. 
  
  
  89. 
  
  90. <div>
    91. 
  
  
  91. 
  
  92. <input type= "button" value= "GetDate"/>
    93. 
  
  
  93. 
  
  94. <input Type=button value= "Getonedaylater"/>
    95. 
  
  
  95. 
  
  96. <input type= "text" id= "ShowTime"/>
    97. 
  
  
  97. 
  
  98. </div>
    99. 
  
  
  99. 
  
  100. </form>
    101. 
  
  
  101. 
  
  102. </body>
    103. 
  
  
  103. 
  
  104.

CS Code:

 
 
    
  
  
  1. 
  
  2. Using System;
    3. 
  
  
  3. 
  
  4. Using System.Collections.Generic;
    5. 
  
  
  5. 
  
  6. Using System.Linq;
    7. 
  
  
  7. 
  
  8. Using System.Web;
    9. 
  
  
  9. 
  
  10. Using System.Web.UI;
    11. 
  
  
  11. 
  
  12. Using System.Web.UI.WebControls;
    13. 
  
  
  13. 
  
  14. Using System.Web.Services;
    15. 
  
  
  15. 
  
  16. Namespace Jquerweb
    17. 
  
  
  17. 
  
  18. {
    19. 
  
  
  19. 
  
  20. public partial class JqueryCSMethodForm:System.Web.UI.Page
    21. 
  
  
  21. 
  
  22. {
    23. 
  
  
  23. 
  
  24. 
  
  
  25. 
  
  26. protected void Page_Load (object sender, EventArgs e)
    27. 
  
  
  27. 
  
  28. {
    29. 
  
  
  29. 
  
  30. 
  
  
  31. 
  
  32. }
    33. 
  
  
  33. 
  
  34. [WebMethod]
    35. 
  
  
  35. 
  
  36. public static String Getnowdate ()
    37. 
  
  
  37. 
  
  38. {
    39. 
  
  
  39. 
  
  40. Return "[{\" nowtime\ ": \" "+ DateTime.Now.ToShortDateString () +" \ "}]";
    41. 
  
  
  41. 
  
  42. }
    43. 
  
  
  43. 
  
  44. [WebMethod]
    45. 
  
  
  45. 
  
  46. public static String getonedaylate (Int32 days)
    47. 
  
  
  47. 
  
  48. {
    49. 
  
  
  49. 
  
  50. Return "[{\ nowtime\]: \" "+ DateTime.Now.AddDays (days). ToShortDateString () + "\"}];
    51. 
  
  
  51. 
  
  52. }
    53. 
  
  
  53. 
  
  54. }
    55. 
  
  
  55. 
  
  56. }
    57.

Note the point:

(1) The filling format of the URL url+ "/method name"

(2) ContentType: "Application/json; Charset=utf-8 ", this must have

(3) The type of the returned data is JSON

(4) Data: "{days:1}", transfer of parameters

(5) The method in the background must be public static and also have [WebMethod] attribute modification

Original link: http://www.cnblogs.com/liyuxin/archive/2011/03/01/1967776.html

"Edit Recommendation"

    1. February 2011 13 jquery Best Plug-in recommendations
    2. Write a failed jquery optimization attempt
    3. JQuery 1.5 Official release five major changes compelling
    4. Dynamic adding and statistics of tabular data by jquery
    5. Simplifying Ajax development with JQuery
"Responsible editor: Chen Yu new TEL: (010) 68476606"


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