Confirm postback OnClientClick button ASP NET

Question

lt asp Button runat  server  ID  btnUserDelete  Text  Delete  CssClass  GreenLightButton                             OnClick  BtnUserDelete Click                             OnClientClick  return UserDeleteConfirmation       meta resourcekey  BtnUserDeleteResource1    gt    I have tried   function UserDeleteConfirmation             if  confirm  Are you sure you want to delete this user                 return true          else             return false      and   function UserDeleteConfirmation         if  confirm  Are you sure you want to delete this user                     doPostBack btnUserDelete                  return false       And none of them works

User · Answer

Using jQuery UI dialog   SCRIPT    lt link rel  stylesheet  href  http   code jquery com ui 1 9 2 themes base jquery-ui css    gt   lt script src  http   code jquery com jquery-1 8 3 js  gt  lt  script gt   lt script src  http   code jquery com ui 1 9 2 jquery-ui js  gt  lt  script gt   lt script gt     function                        lt   btnUserDelete ClientID  gt    on  click   function  event                    event preventDefault                        dialog-confirm   dialog                       resizable  false                      height  140                      modal  true                      buttons                            Ok  function                                    this  dialog  close                                  doPostBack      lt    btnUserDelete ClientID   gt    attr  name                                                            Cancel  function                                    this  dialog  close                                                                                              lt  script gt    HTML    lt div id  dialog-confirm  style  display  none   title  Confirm Delete  gt       lt p gt  lt span class  ui-icon ui-icon-alert  style  float  left  margin  0 7px 20px 0   gt  lt  span gt Are you sure you want to delete this user  lt  p gt   lt  div gt

User · Answer

The code is like this   In Aspx    lt asp Button ID  btnSave  runat  server  Text  Save  OnClick  btnSave Click  CausesValidation true   gt    in Cs   protected void Page Load object sender  System EventArgs e         if   IsPostBack                  btnSave Attributes  Onclick      return confirm  Do you really want to save                          protected void btnSave Click object sender  EventArgs e       Page Validate        if  Page IsValid                 Update the database          lblMessage Text    Saved Successfully

User · Answer

This is a simple way to do client-side validation BEFORE the confirmation  It makes use of the built in ASP NET validation javascript    lt script type  text javascript  gt      function validateAndConfirm             Page ClientValidate  GroupName        GroupName  is the ValidationGroup         if  Page IsValid                return confirm  Are you sure                       return false         lt  script gt    lt asp TextBox ID  IntegerTextBox  runat  server  Width  100px  MaxLength  6    gt   lt asp RequiredFieldValidator ID  reqIntegerTextBox  runat  server  ErrorMessage  Required      ValidationGroup  GroupName   ControlToValidate  IntegerTextBox    gt   lt asp RangeValidator ID  rangeTextBox  runat  server  ErrorMessage  Invalid      ValidationGroup  GroupName  Type  Integer  ControlToValidate  IntegerTextBox    gt   lt asp Button ID  SubmitButton  runat  server  Text  Submit   ValidationGroup  GroupName      OnClick  SubmitButton OnClick  OnClientClick  return validateAndConfirm       gt    Source  Client Side Validation using ASP Net Validator Controls from Javascript

User · Answer

There are solutions here that will work  but I don t see anyone explaining what is actually happening here  so even though this is 2 years old I ll explain it   There is nothing  wrong  with the onclientclick javascript you are adding   The problem is that asp net is adding it s on onclick stuff to run AFTER whatever code you put in there runs   So for example this ASPX    lt asp Button ID  btnDeny  runat  server  CommandName  Deny  Text  Mark  Denied   OnClientClick  return confirm  Are you sure        gt    is turned into this HTML when rendered    lt input name  rgApplicants ctl00 ctl02 ctl00 btnDeny  id  rgApplicants ctl00 ctl02 ctl00 btnDeny   onclick  return confirm  Are you sure      doPostBack  rgApplicants ctl00 ctl02 ctl00 btnDeny       type  button  value  Mark  Denied   abp  547  gt    If you look closely  the   doPostBack stuff will never be reached  because the  confirm  will always return true false before   doPostBack is reached   This is why you need to have the confirm only return false and not return when the value is true   Technically  it doesn t matter if it returns true or false  any return in this instance would have the effect of preventing the   doPostBack from being called  but for convention I would leave it so that it returns false when false and does nothing for true

User · Answer

Try this    lt asp Button runat  server  ID  btnDelete  Text  Delete     onClientClick  javascript return confirm  Are you sure you want to delete this user      OnClick  BtnDelete Click    gt

User · Answer

I know this is old and there are so many answers  some are really convoluted  can be quick and inline   lt asp Button runat  quot server quot  ID  quot btnUserDelete quot  Text  quot Delete quot  CssClass  quot GreenLightButton quot  OnClick  quot BtnUserDelete Click quot  OnClientClick  quot return confirm  Are you sure you want to delete this user     quot  meta resourcekey  quot BtnUserDeleteResource1 quot    gt

User · Answer

You can put the above answers into one line like this  And you don t need to write the function         lt asp Button runat  server  ID  btnUserDelete  Text  Delete  CssClass  GreenLightButton           OnClick  BtnUserDelete Click  meta resourcekey  BtnUserDeleteResource1  OnClientClick  if    confirm  Are you sure you want to delete this user     return false      gt

User · Answer

Try this   function Confirm         var confirm value   document createElement  INPUT        confirm value type    hidden       confirm value name    confirm value            if  confirm  Your asking                  confirm value value    Yes               document forms 0  appendChild confirm value                 else           confirm value value    No           document forms 0  appendChild confirm value             In Button call function    lt asp Button ID  btnReprocessar  runat  server  Text  Reprocessar  Height  20px  OnClick  btnReprocessar Click  OnClientClick  Confirm     gt    In class  cs call method           protected void btnReprocessar Click object sender  EventArgs e                string confirmValue   Request Form  confirm value            if  confirmValue     Yes

User · Answer

try this      lt asp Button runat  server  ID  btnUserDelete  Text  Delete  CssClass  GreenLightButton      onClientClick   return confirm  Are you sure you want to delete this user         OnClick  BtnUserDelete Click   meta resourcekey  BtnUserDeleteResource1     gt

User · Answer

Try this    lt asp Button runat  server  ID  btnUserDelete  Text  Delete  CssClass  GreenLightButton                         OnClick  BtnUserDelete Click                         OnClientClick  if     UserDeleteConfirmation    return false     meta resourcekey  BtnUserDeleteResource1    gt    This way the  return  is only executed when the user clicks  cancel  and not when he clicks  ok    By the way  you can shorten the UserDeleteConfirmation function to   function UserDeleteConfirmation         return confirm  Are you sure you want to delete this user

User · Answer

try this   OnClientClick  return confirm  Are you sure        Also set   CausesValidation  False

[javascript] Confirm postback OnClientClick button ASP.NET

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