Getting Count of Selected Values in ListBox

[ietprofessional]

Hi Everyone,

Can someone tell me how to get the count of selected values in ListBox?

Thanks!

 

[Isadore]

jet: this may not be what you need; perhaps a one line command may bring back the ct -- in this routine I cycle through the datalist - could easily put a counter in this:

n = 0
If listContacts.SelectedIndex <> -1 Then          
  If listContacts.SelectionMode = ListSelectionMode.Single Then
  txtCN.Text = listContacts.SelectedItem.Text
  txtCID.Text = listContacts.SelectedItem.Value
Else
  For i = listContacts.SelectedIndex To listContacts.Items.Count - 1
  If listContacts.Items(i).Selected Then
    n = n + 1  
    If n = 1 Then              
      s &= listContacts.Items(i).Text 
      r &= listContacts.Items(i).Value 
    Else       
      s &= ", " & listContacts.Items(i).Text 
      r &= ", " & listContacts.Items(i).Value 
    End If
   End If
  Next
txtCN.Text = s
txtCID.Text = r
End If

...might spur an idea...

 

[Veep]

int counter =0;
			foreach(ListItem li in ListBox1.Items)
			{
				if(li.Selected)
					counter++;
			}
			Response.Write("The Count Is: " + counter.ToString());

 

[ca8msm]

Just check if each one is selected e.g.

        Dim i As Integer = 0
        Dim li As ListItem
        For Each li In ListBox1.Items
            If li.Selected = True Then i += 1
        Next
        Response.Write(i)

Is that what you mean?


----------------------------------------------------------------------

Need help finding an answer?

Try the search facilty (

http://www.tek-tips.com/search.cfm)

or read FAQ222-2244 on how to get better results.

 

[Veep]

We must have been writing that at the same time (despite what sedj says about me ). Hey, beats the convertors. Two functional versions for the price of one question.

 

[Isadore]

veep, ca:

Wouldn't this be a good candidate to use the CallBack functionality of dot NET?

Paul (link9) and I were discussing this just a couple of threads down.

That is, if you are only going to go for a count, and you want to prevent a post back, seems like this would be a good candidate for implementation of this process.

The links Paul provided are very good; allows complete handling of the event on the clien side...

Just a thought...

 

[ca8msm]

Veep - I guess sedj was wrong about you and your simultaneous posts (either that or I've started it as well!).

You're right though it is definately better than any converter!

Isadore - Yeah I saw that thread - very interesting. I guess it's why[b/] ietprofessional needs this count as to whether it would be best to do it client or server side. As you say, if it's just to display how many items a user selected then CallBack may be the way to go but if it's to do any other work on it it may be more suited for server side.

----------------------------------------------------------------------

Need help finding an answer?

Try the search facilty (

http://www.tek-tips.com/search.cfm)

or read FAQ222-2244 on how to get better results.