How to avoid this attitude?!

How to avoid this attitude?!

Hi,

I have a sign in form wit ajax as per below code but sometimes it doesn't work and it just goes to this URL:


It is is not frequently happening, maybe once or twice a week only... I am not sure why and when exactly it occurs.but I want to avoid it.

here is the code:

  2. $("#frmSignin").validate({
  3. rules:
  4. {
  5. txtUserID: { required: true },
  6. txtPassword: { required: true }
  7. },
  8. submitHandler: function (form)
  9. {
  10. $.ajax({
  11. type: 'POST',
  12. url: "signin.php",
  13. data: $('#frmSignin').serialize(),
  14. beforeSend: function()
  15. {
  16. $("#btnSignin").parent().hide();
  17. $("#divUserID").hide();
  18. $("#divPassword").hide();
  20. $.mobile.loading('show', {theme:"b", text:"Please wait..", textonly: false, textVisible: true});
  21. },
  22. success: function(data)
  23. {
  24. if (data.match(/true/))
  25. {
  26. $.mobile.changePage('my.php', { reloadPage: true, transition: "flow"} );
  27. }
  28. else
  29. {
  30. $.mobile.loading('hide');
  32. $('#InvalidUserIDPassword').popup();
  33. $("#InvalidUserIDPassword").popup("open"); 

  35. $('#txtUserID').val("");
  36. $('#txtPassword').val("");
  37. $("#btnSignin").parent().show();
  38. }
  39. },
  40. error: function(jq, status, message)
  41. {
  42. alert('A jQuery error has occurred. Status: ' + status + ' - Message: ' + message);
  43. }
  44. });
  45. }
  46. });