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(Abstract) jquery Exercise 2-countdown

Source: Internet
Author: User
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Code:
  1. Recently, an online examination system needs to be added to the examination countdown function. Obviously, Ajax is the most convenient implementation. It's easy to use jquery. Jquery provides convenient Ajax functions.
  2. Technology: HTML + servlet + jquery
  3. Function: Countdown is displayed on the page. The time comes from the server. The volume is automatically handed in after the time.
  4. The servlet code is as follows:
  5. Response. setcontenttype ("text/html; charset = UTF-8 ");
  6. Response. setheader ("cache-control", "No-Cache ");
  7. Printwriter out = response. getwriter ();
  8. Try {
  9. If ("Submit". Equals (request. getparameter ("action "))){
  10. // Submit the paper
  11. // Todo: Submit the volume here
  12. Out. println ("submitted ");
  13. } Else {
  14. // Countdown
  15. // Set the end time
  16. Calendar timeend = calendar. getinstance ();
  17. Timeend. Set (2008, 10, 7, 14, 50, 0 );
  18. Long end = timeend. gettimeinmillis ();
  19. // Out. Print (SDF. Format (timeend. gettime () + "<br> ");
  20. // Obtain the current time
  21. Calendar rightnow = calendar. getinstance ();
  22. // Out. Print (SDF. Format (rightnow. gettime () + "<br> ");
  23. Long Now = rightnow. gettimeinmillis ();
  24. // Calculate the remaining time
  25. Int left = (INT) (end-now );
  26. If (left <= 0 ){
  27. // Time
  28. Out. Print ("over ");
  29. } Else {
  30. Int lefthour = left/(1000*60*60 );
  31. Left = left % (1000*60*60 );
  32. Int leftminute = left/(1000*60 );
  33. Left = left % (1000*60 );
  34. Int leftsecond = left/(1000 );
  35. Out. Print (lefthour + "Hour" + leftminute + "Minute" + leftsecond + "second ");
  36. }
  37. }
  38. } Finally {
  39. Out. Close ();
  40. }
  41. HTML is handed over to jquery. The Code is as follows:
  42. <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
  43. <HTML>
  44. <Head>
  45. <Title> </title>
  46. <Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8">
  47. <SCRIPT src = "../JS/jquery. js" type = "text/JavaScript"> </SCRIPT>
  48. <SCRIPT type = "text/JavaScript">
  49. $ (Document). Ready (function (){
  50. Setinterval (FIG, 1000 );
  51. });
  52. // Obtain the remaining time
  53. Function getlefttime (){
  54. $. Get ("/jquery/timeservlet? ", Function (data ){
  55. If (Data = "over "){
  56. // Window. Location = ".../index. jsp ";
  57. $ ("# Paperform"). Submit ();
  58. }
  59. Else {
  60. $ ("# Nowis"). Text (data );
  61. }
  62. });
  63. }
  64. </SCRIPT>
  65. </Head>
  66. <Body>
  67. <Div id = "nowis"> </div>
  68. <Form ID = "paperform" method = "Post" Action = "/jquery/timeservlet? Action = submit ">
  69. </Form>
  70. </Body>
  71. </Html>
  72. Test.
  73. Alas, the name of jquery is a javascript library. Many people are talking about it and it becomes a technical name. Haha.

 

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