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Thread: read combobox text
read combobox text
user name
 2006-12-05 01:36:09 

  


  

    


Steve, I am not sure in .Net. ; Hopefully someone will chime in.  I have
included a VB6 example.  .Net should be similar.



Private Sub Combo1_Click()

Dim ComboData As String

Dim ComboListIndex As Integer

If Combo1.ListIndex = -1 Then Exit Sub

 ;  ComboListIndex = Combo1.ListIndex

   ComboData = Combo1.List(ComboListIndex)

   MsgBox "Item selected was " & ComboData

End Sub



Private Sub Form_Load()

Combo1.AddItem ("dog")

Combo1.AddItem ("cat")



End Sub







Steve wrote:

eGroups.com" type="cite">

  

  
For VB.Net 2005, How do you read the text of a combobox item?

  

combobox1.items.Add("Tokyo")

  

How do I read the string "Tokyo"?

  

P.S. I'm still looking for a Reference manual that will explain this

kind of stuff, if anyone has any suggestions. I have four VB.Net

reference books and not one can answer this basic question. How

pathetic is that?

  

  

  







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    read combobox text
  


  

     user name

     2006-12-05 15:25:44
  


  

    

  


  

    



Air code, and If I mis-state things, I hope someone will 
correct me, but this is my understanding.


 


1) In .NET everything is an object.  So, if you "add 
something to a combobox", you are adding an object.


 


2) Comboboxes (and likewise listboxes) have an items 
property, which is an object that implements ICollection, so you can use the 
methods of the Collection interface, like Add, remove, Insert, Clear, 
etc.


 


3) When you add an object to a cbo, you 
are  adding the object to the control's items collection (Or more 
abstractly, the items member, which behaves like a collection -- I believe 
that's the right way to think of it in .NET). 


 


4) This means you can enumerate the items collection like 
any other -- bearing in mind that the collection comprises untyped objects (that 
has Option Strict, CType, and DirectCast implciations for the data type), 
f'rex


    With cbo1.items


        .Clear()    


        .Add("One")    ' add a string 
object whose value is "One"


        .Add("Two")    ' add a string 
object whose value is "Two"


        .Insert(0,"Zero")    'Insert a 
string object whose value is "Zero" at ordinal position 0


    End With


 


5) If you add an object, the displaywill normally execute 
the object's ToString method... since the ToString method (which all objects 
have) of a string is it's value, you see the string in the combo.  You also 
get the sting's value in output.  F'rex


 




    Dim o as object


    For Each o in cbo1.items


        Debug.Writeln(o) ;       



    Next


 


If you know it's a string, you can avoid late binding with 



 

    Dim o as object


    For Each o in cbo1.items


        Debug.Writeln(DirectCast(o, 
String).ToString


        
Debug.Writeln(DirectCast(o, String)


        
Debug.Writeln(CType(o, String)    'etc


    Next


 


If it's a user-defined or other complex object, it will 
execute ToString, so make sure you write that overridable method.  In that 
case you really should use DirectCast or CType to access the object's 
properties, though.


 


That out of the way....  Here's the answer to what you 
actually asked.


 


6) The two properties that test for the selected values are 



SelectedIndex, or -1 if nothing is selected.  
Conversely you can set the selection to Nothing by setting it to -1.  This 
propoerty replaces ListIndex in VB6.


SelectedItem, wichihc returns a reference to the item, or 
the value Nothing if nothing is selected.  (I think you can also set that 
property to Nothing to blank the combo -- not 
sure).   


You can then use the return value as you see fit.  



F'rex, 


For strings these should work:


cbo1.selectedItem


cbo1.selectedItem.ToString


cbo1.items(SelectedIndex)


 


for a combo that store a multi-field Employee object, you 
could get the ID # field of that record object with


 


Dim i as Integer = DirectCast(cbo1.SelectedItem, 
EmployeeRecord).ID




Dim i as Integer = CType(cbo1.SelectedItem, 
EmployeeRecord).ID


 


It also means that you 
can store a complex object, show it's ToString method, and then work with 
another other property of the object once you retrieve it.  When you get 
used to it, it beats the VB6 way all to hell. ; F'rex, there's no VB6-style 
ItemData property, but you could define one for the object... then show the 
ToStrng method int he comboi, and then later work with ItemData of the retrieved 
object.


 


For multi-select listboxes there are analogous SelecteItems and SelectedIndexes Collections


 


HTH


-BDN








From: helpwithvb@yahoogroups.com 
[mailto:helpwithvb@yahoogroups.com] On Behalf Of Tim 
Lewis
Sent: Monday, December 04, 2006 8:36 PM
To: 
helpwithvb@yahoogroups.com
Subject: Re: [helpwithvb] read combobox 
text







Steve, I am not sure in .Net. ; Hopefully someone will chime in.  I 
have included a VB6 example.  .Net should be similar.

Private Sub 
Combo1_Click()
Dim ComboData As String
Dim ComboListIndex As 
Integer
If Combo1.ListIndex = -1 Then Exit Sub
   ComboListIndex 
= Combo1.ListIndex
   ComboData = 
Combo1.List(ComboListIndex)
   MsgBox "Item selected was " 
& ComboData
End Sub

Private Sub Form_Load()
Combo1.AddItem 
("dog")
Combo1.AddItem ("cat")

End Sub



Steve wrote: 

eGroups.com type="cite">
  

  
For VB.Net 2005, How do you read the text of a combobox 
  item?

combobox1.items.Add("Tokyo")

How do I read the 
  string "Tokyo"?

P.S. I'm still looking for a Reference manual that will 
  explain this
kind of stuff, if anyone has any suggestions. I have four 
  VB.Net
reference books and not one can answer this basic question. 
  How
pathetic is 
that?





__._,_.___





__,_._,___

  

  
  
   
     
    

  

    read combobox text
  


  

     user name

     2006-12-05 13:57:18
  


  

    
Good Morning Steve,

>>  How do I read the string "Tokyo"?

Do you mean 
" How Do I Know What The User Selected ?"    ( ? )

From This Sample / Example:

htt
p://vb-helper.com/howto_net_listbox_class.html

...you can use the ListBox's   SelectedItem   method to see
which item is
selected.

< other teaching points >

Finally, this code shows how the program ( will )
display information about the item you click (upon ). 	
 	
' Display the selected item's information:
Private Sub ListBox1_SelectedIndexChanged(ByVal sender As _
    System.Object, ByVal e As System.EventArgs) Handles _
    ListBox1.SelectedIndexChanged

    Dim food_item As FoodItem = ListBox1.SelectedItem()

    lblInfo.Text = food_item.ToString()
End Sub	



All The Best,
Steve

08:56  AM  EST  Tuesday, December 05, 2006


From: helpwithvb@yahoogroups.com 
[mailto:helpwithvb@yahoogroups.com] On Behalf Of Tim Lewis
Sent: Monday, December 04, 2006 8:36 PM
To: helpwithvb@yahoogroups.com
Subject: Re: [helpwithvb] read combobox text

Steve, I am not sure in .Net.  Hopefully someone will chime
in.  
I have included a VB6 example.  .Net should be similar.

Private Sub Combo1_Click()
Dim ComboData As String
Dim ComboListIndex As Integer
If Combo1.ListIndex = -1 Then Exit Sub
   ComboListIndex = Combo1.ListIndex
   ComboData = Combo1.List(ComboListIndex)
   MsgBox "Item selected was " & ComboData
End Sub

Private Sub Form_Load()
Combo1.AddItem ("dog")
Combo1.AddItem ("cat")

End Sub



Steve wrote: 
For VB.Net 2005, How do you read the text of a combobox
item?

combobox1.items.Add("Tokyo")

How do I read the string "Tokyo"?

P.S. I'm still looking for a Reference manual that will
explain this
kind of stuff, if anyone has any suggestions. I have four
VB.Net
reference books and not one can answer this basic question.
How
pathetic is that?
.
_ 


 
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    read combobox text
  


  

     user name

     2006-12-06 11:34:54
  


  

    

  


  

    







ComboBox1.SelectedItem should give you what you are looking for.



 



 



 















From: helpwithvb@yahoogroups.com [mailto:helpwithvb@yahoogroups.com] On Behalf Of Tim Lewis

Sent: Monday, December 04, 2006
8:36 PM

To: helpwithvb@yahoogroups.com

Subject: Re: [helpwithvb] read
combobox text






 












Steve, I
am not sure in .Net. ; Hopefully someone will chime in.  I have
included a VB6 example.&nbsp; .Net should be similar.



Private Sub Combo1_Click()

Dim ComboData As String

Dim ComboListIndex As Integer

If Combo1.ListIndex = -1 Then Exit Sub

 ;  ComboListIndex = Combo1.ListIndex

&nbsp;  ComboData = Combo1.List(ComboListIndex)

&nbsp;  MsgBox "Item selected was " & ComboData

End Sub



Private Sub Form_Load()

Combo1.AddItem ("dog")

Combo1.AddItem ("cat")



End Sub







Steve wrote: 



eGroups.com" type=cite>





For VB.Net 2005, How do you read the text of a
combobox item?



combobox1.items.Add(&quot;Tokyo&quot;)



How do I read the string "Tokyo&quot;?



P.S. I'm still looking for a Reference manual that will explain this

kind of stuff, if anyone has any suggestions. I have four VB.Net

reference books and not one can answer this basic question. How

pathetic is that?









 











__._,_.___





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