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Ajax (User Registration)

Source: Internet
Author: User
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HTML code:

  1. <Head>
  2. <SCRIPT type = "text/JavaScript">
  3. VaR XMLHTTP;
  4. Function createxmlhttprequest ()
  5. {
  6. If (window. XMLHttpRequest)
  7. {
  8. XMLHTTP = new XMLHttpRequest (); // Mozilla Browser
  9. }
  10. Else if (window. activexobject)
  11. {
  12. Try
  13. {
  14. XMLHTTP = new activexobject ("msxml2.xmlhttp ");
  15. }
  16. Catch (e ){}
  17. Try
  18. {
  19. XMLHTTP = new activexobject ("Microsoft. XMLHTTP ");
  20. }
  21. Catch (e ){}
  22. If (! XMLHTTP)
  23. {
  24. Alert ("You cannot create an XMLHTTP object instance! ");
  25. }
  26. }
  27. }
  28. Function checkname (username)
  29. {
  30. Createxmlhttprequest ();
  31. VaR url = "dispost. aspx? Name = "+ username;
  32. XMLHTTP. onreadystatechange = checkusername;
  33. XMLHTTP. Open ("get", URL, true );
  34. XMLHTTP. Send (null );
  35. }
  36. Function checkusername ()
  37. {
  38. If (XMLHTTP. readystate = 4)
  39. {
  40. If (XMLHTTP. Status = 200)
  41. {
  42. If (XMLHTTP. responsetext = "true ")
  43. {
  44. Document. getelementbyid ('check'). innertext = "registrable ";
  45. }
  46. Else
  47. {
  48. Document. getelementbyid ('check'). innertext = "cannot be registered ";
  49. }
  50. }
  51. }
  52. }
  53. </SCRIPT>
  54. </Head>
  55. <Body>
  56. Username: <input id = "username" type = "text" onkeyup = "checkname (document. getelementbyid ('username'). Value);">
  57. <Div id = "check"> </div>
  58. </Body>

 

  1. Dispost. aspx background code:

  1. Protected void page_load (Object sender, eventargs E)
  2. {
  3. User user = new user ();
  4. If (user. checkname (resquest. querystring ["name"]. tostring ()))
  5. {
  6. Response. Write ("false ");
  7. Response. End ();
  8. }
  9. Else
  10. {
  11. Response. Write ("true ");
  12. Response. End ();
  13. }
  14. }

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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