What is the difference RSS

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  Csharp22

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  What is the difference

  Mar 27, 2012 04:16 PM|LINK

  Hi ,

  what is the difference between these two code snippets

  1)

  <asp:Button ID="BtnDelete" runat="server" Text="Delete" style = "width: 95%" OnClientClick="return confirm('Are you sure you want to delete the EMP?');"
  onclick="BtnDeleteEmp_Click"/>

  this works perfect, when i click on the button it asks me whether i am sure, if i click ok then the code in code behind executes and deletes the record from the database.

  2) but i dont want to ask the confirmation to the user every time.. i used some validation, only when there is a value in dropdown list i need to ask confirmation , so i modified like this.

  <asp:Button ID="BtnDelete" runat="server" Text="Delete" style = "width: 95%" OnClientClick="Confirm()"
  onclick="BtnDeleteEmp_Click"/>

  function Confirm() {

  var class = $('#<%=ddlClass2.ClientID%>').val();
  if (class != "Please select") {
  return confirm('Are you sure you want to delete the EMP?');
  }
  }

  when i used the above code, no matter if i click yes or no in the confirmation it always executes the code behind c# code , what am i missing?

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  bbcompent1

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  Re: What is the difference

  Mar 27, 2012 04:18 PM|LINK

  Because both call onclick="BtnDeleteEmp_Click". The only difference is hte onclientclick is calling a separate js routine while the other runs it inline. So essentially, they do the same thing, the js location is different.

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  ajb587

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  Re: What is the difference

  Mar 27, 2012 04:19 PM|LINK

  The return value of you functin Confirm() is not being passed to the ASP Button control.

  Try

  <asp:Button ID="BtnDelete" runat="server" Text="Delete" style = "width: 95%" OnClientClick="return Confirm();"
  onclick="BtnDeleteEmp_Click"/>

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  bbcompent1

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  Re: What is the difference

  Mar 27, 2012 04:21 PM|LINK

  Try it this way instead:

  <asp:Button ID="btnDelete" runat="server" Text="Delete" UseSubmitBehavior="false" OnClick="btnDelete_Click" OnClientClick="return confirmation();" /> 
   
  function confirmation() 
  

  { 
          if(confirm("Are you sure you want to delete? This action cannot be undone.")) return true; 
  else return false; 
  } 
  

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  Csharp22

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  Re: What is the difference

  Mar 27, 2012 04:45 PM|LINK

  I tried the above code, but now even thougth i clicked OK, it doesnt execute the server side code.

  PS:  The delete button is inside the update panel

  <asp:Button ID="BtnDelete" runat="server" UseSubmitBehavior = "false" Text="Delete" style = "width: 95%" OnClientClick="return Confirm();"
  onclick="BtnDeleteEmp_Click"/>

  function Confirm() {

  var classif = $('#<%=ddlClass2.ClientID%>').val();
  if (classif != "Please select") {
  if (confirm("Are you sure you want to delete the Class? This action cannot be undone.")) {
  return true;
  }
  
  }
  else {

  
  return false;
  }
  }

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  bbcompent1

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  Re: What is the difference

  Mar 27, 2012 04:52 PM|LINK

  Hmm, what does your code behind look like?

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  bbcompent1

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  Re: What is the difference

  Mar 27, 2012 04:52 PM|LINK

  I would set a breakpoint at that point in your code behind to see what happens and if its even calling the routine.

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  Csharp22

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  Re: What is the difference

  Mar 27, 2012 04:57 PM|LINK

  Code behind just deletes the record from the database.

  i have a breakpoint, but after the changes it never hits the breakpoint.

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  bbcompent1

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  Re: What is the difference

  Mar 27, 2012 05:15 PM|LINK

  You can always do this guy as a code behind check like in this thread.

  http://forums.asp.net/t/1517822.aspx/1

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  ajb587

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  Re: What is the difference

  Mar 27, 2012 05:23 PM|LINK

  Javascript

  <script type="text/javascript">
  		function Confirm()
  		{
  			var ddlClass = $('#<%=ddlClass2.ClientID%>').val();
  
  			rval = null;
  
  			if (ddlClass != "Please Select")
  				rval = confirm('Are you sure you want to delete the EMP?');
  			else
  				rval = false;
  
  			alert(rval);
  
  			return rval;
  		}
  </script>

  ASPX

  	<asp:Button ID="BtnDelete" runat="server" Text="Delete" style = "width: 95%" OnClientClick="return Confirm();" OnClick="btnDelete_Clicked"/>

  
  It looks like the "UseSubmitBehavior" property is preventing the server sider post back in your current code.

  
  
  

  • Marked as answer by Csharp22 on Mar 27, 2012 07:02 PM