Question

vb.net + Asp.net 2.0 + Delete Confirmation

Asked by: robbhill

Here is my scenario.  I have 3 dropdowns on a form and a button called process.  The first dropdown box of the three has three values.  One of those values is "Dealocate".  If the user choses this option, the process button should act like a delete button...but only if that dropdown has that value.  How would I go about making the button act like a delete button in this scenario...

Thanks,

My environment is as follows:
VS 2005, vb.net, asp.net 2.0
This is a content page inside a master page.

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Asked On
2008-01-16 at 07:48:31ID23087277
Tags

confirmation

,

button

,

delete

Topics

Programming for ASP.NET

,

Microsoft Visual Basic.Net

,

Web Languages/Standards

Participating Experts
2
Points
500
Comments
8

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Answers

 

by: samtran0331Posted on 2008-01-16 at 08:04:16ID: 20673019

check the dropdownlist's selectedvalue....

Like in the button click or the dropdownlist's selectedindexchanged method,

If dropdownlistname.selectedvalue = "Dealocate" then
'do delete
end if

 

by: robbhillPosted on 2008-01-16 at 08:14:44ID: 20673125

This doesnt work...when the button's server side click event is fired...I cannot assign a client side event to fire afterwards...its too late at that point....

 Protected Sub cmdProcess_Click1(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdProcess.Click
        If ddlChoice.SelectedValue = 0 Then
           'insert

      ElseIf ddlChoice.SelectedValue = 1 Then
          'delete confirmation  with yes or no
'if yes then call function to delete
'if no then exit sub
End If

       


    End Sub

 

by: robbhillPosted on 2008-01-16 at 08:17:02ID: 20673154

Do I need to test the selected value on a javascript function...and then based on the client side check....assign a client side attribute via javascript to the server side button before it is ever fired?

And if so..any ideas..what that javascript would be?  I am in a content page on a master/content relationship

 

by: tusharashahPosted on 2008-01-16 at 08:18:16ID: 20673172

You can attach script like following to OnClientClick event of button to check selected value in dropdown and then give javascript based confirmation window depending on it's value:

If Not IsPostBack Then 
    Button1.OnClientClick = String.Format("if(document.getElementById('{0}').value=='Dealocate') return confirm('are you sure?');", DropDownList1.ClientID) 
End If 

                                              
1:
2:
3:

Select allOpen in new window

 

by: robbhillPosted on 2008-01-16 at 08:51:29ID: 20673533

I am getting object ddlchoice has not properties as a javascript error when I click the button.

I added this code into my page load.

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
  cmdProcess.OnClientClick = String.Format("if(document.getElementById('ddlChoice').value=='1') return confirm('are you sure?');", cmdProcess.ClientID)


    End Sub

 

by: tusharashahPosted on 2008-01-16 at 09:00:32ID: 20673648

Code should be like following

 cmdProcess.OnClientClick = String.Format("if(document.getElementById('{0}').value=='1') return confirm('are you sure?');", ddlChoice.ClientID)



 

by: robbhillPosted on 2008-01-16 at 09:14:29ID: 20673825

This is how I had to do it .  Thanks for your help....not sure why you put a '0' in the ID value.  I had to account for the container in the content page  

 cmdProcess.OnClientClick = String.Format("if(document.getElementById('ctl00_ContentPlaceHolder1_ddlChoice').value=='1') return confirm('are you sure?');", cmdProcess.ClientID)

 

by: tusharashahPosted on 2008-01-16 at 11:08:01ID: 20674936

Glad you have it working.

When you're dealing with the scenario like this (master/content) the ID of the control at run time will be different than original ID of the control as you have noted. The runtime ID is known as ClientID. It's always good practice, not to hard code this ClientId in code behind. Since, in this case ddlChoice.ClientID will be equal to 'ctl00_ContentPlaceHolder1_ddlChoice', you can write the same working statement as follow:
   cmcProcess.OnClientClick = "if(document.getElementById('" + ddlChoice.ClientID +"').value=='1') return confirm('are you sure?');"

Now, String.Format just gives you a cleaner approach of writting above statement. Where {0} will assume the value of the first parameter after comma. [ String.Format("{0}", firstParam) ]
cmcProcess.OnClientClick = String.Format("if(document.getElementById('{0}').value=='1') return confirm('are you sure?');", ddlChoice.ClientID)

Reference:
  Control.CleintID: http://msdn2.microsoft.com/en-us/library/system.web.ui.control.clientid.aspx
  String.Format: http://msdn2.microsoft.com/en-us/library/fht0f5be.aspx

-tushar

20120131-EE-VQP-002

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