[RESOLVED] More ComboBoxes :(

Hey, I've posted about this problem in my previous thread but I don't think anyone can see it.
I basically would just like to be pointed in the right direction to finding the property I need or whatever.
What I wish to do is assign sort of like, a second string to each option on a combo box. Is this possible? Because when the user selects an option, I want to use the string that is related to the option chosen... not the text itself, if that makes sense?

Can you give an example?

Okay. The program I need it for is to send commands to devices over the network.
So if a user selects ON on the combo box.. I want the command for ON to be used.. which for example might be something like "POWR%1#"... so its not plain english it needs to be understandable for people who don't know the commands. So I can't use combobox.text because it would just use "ON".. you see? :)

Thanks for replying :D

You could use

Combobox1.selectedindex (I believe)

So it wont matter on the text, just the selected item.

I assume you're adding strings to the combobox. Strings can, obviously, only hold 1 string value, so they wont do you any good.

Remember that a ComboBox can hold any type of Object, so you could create your own structure like this:

VB.NET Code:

Private Structure CommandItem
        Public DisplayText As String
        Public Command As String
 
        Sub New(ByVal text As String, ByVal com As String)
            DisplayText = text
            Command = com
        End Sub
 
        Public Overrides Function ToString() As String
            Return DisplayText
        End Function
    End Structure

As you can see, it holds two members: DisplayText and Command.
I guess you can figure out what they are intended to hold? ;)
Add items like this:

VB.NET Code:

ComboBox1.Items.Add(New CommandItem("ThisIsMyItem", "ThisIsMyCommand"))

The ComboBox' SelectedItem property will return CommandItems, so you can easily retrieve the Command from the selected item.

Okay, thanks for your help.
So I would need a new commanditem structure for every command?

Quote:

---

Originally Posted by Eminee

Okay, thanks for your help.
So I would need a new commanditem structure for every command?

---

Yeah.

Righto.
So why would I need to add items with
ComboBox1.Items.Add(New CommandItem("ThisIsMyItem", "ThisIsMyCommand"))
If I have the structure... would it not be something like
ComboBox1.Items.Add(New CommandItem(DisplayText, Command))
??
I'm a bit confused :S Sorry.

Hi.
You can also have a look here. It's for a datagridview but i think it can be used for your needs also.

http://www.vbforums.com/showthread.php?t=475854

I'm still not getting anywhere :(
So confused..

Ok.
Here i'll make it easier.

Code:

---

  Private Sub addcombo()
        Dim myDivisions As New ArrayList
        With myDivisions
            .Add(New StructureGeneralComboHelper("HELLO", 2))
            .Add(New StructureGeneralComboHelper("HELLO1", 2))
            .Add(New StructureGeneralComboHelper("TEST", 1))
            .Add(New StructureGeneralComboHelper("HELLO3", 2))
            .Add(New StructureGeneralComboHelper("TEST1", 1))
            .Add(New StructureGeneralComboHelper("SOMETHINGELSE", 0))
            .
        End With
        Me.ComboBox1.Sorted = False
        Me.ComboBox1.SuspendLayout()
        With Me.ComboBox1
            .DataSource = myDivisions
            .DisplayMember = "Name"
            .ValueMember = "Id"
        End With
        Me.ComboBox1.ResumeLayout()
    End Sub

---

Now it's easy,non? You just add your string and a code id and put them in the combobox.
ok?

Sorry i forgot the structure.
Here:

Code:

---

Public Structure StructureGeneralComboHelper
        Private divName As String
        Private divID As Integer

        Public Sub New(ByVal name As String, ByVal id As Integer)
            divName = name
            divID = id
        End Sub

        Public ReadOnly Property Name() As String
            Get
                Return divName
            End Get
        End Property

        Public ReadOnly Property Id() As Integer
            Get
                Return divID
            End Get
        End Property
    End Structure

---

But the thing is.. I don't need a code id. I need two strings? Can you do that too?

I think because of my code it will make this a bit more tricky to implement.
See.. I already have two combo boxes. The first one has a list of devices and when you select a device the second combobox displays a list of commands that are used for that device. So you see the second combobox is already populated by the first combo box.

Code:

---

  Public lists As New Dictionary(Of String, String())

---

Code:

---

        Me.lists.Add("Panasonic Projector", New String() {"On", "Off"})
        Me.lists.Add("Other Projector", New String() {"On", "Off"})
        Me.lists.Add("Other", New String() {"Choice1", "Choice2"})


        For Each key As String In Me.lists.Keys
            Me.comDevice.Items.Add(key)
        Next key

---

Code:

---

  Private Sub comDevice_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles comDevice.SelectedIndexChanged
        Me.comButton1.DataSource = Me.lists(CStr(Me.comDevice.SelectedItem))
    End Sub

---

Thats the code I'm using.
Is there a way to make a structure that will have a device, with command options which each have an option of their own?

????
But all you need to do is add the items to the second combo.
P.E.
Panasonic project. Ok you select it and you do a combo add item "on" and another combo add item "off".
You don't need a structure or anything. You just erase the previous items on your combo2 and add the items.
All you have to do is have an arraylist or dictionary or something that will have the combo options.
Panasonic -- on
Panasonic - Off
Other -- choice1
Other -- choice 2
etc.
So when the combo gets "Panasonic" you will search for the exact string (you can use my structure to have the first combo to have a codeid so you can search for the id but if it's confising, scr#w it)
and you will get the options of panasonic (on,off) then you will add them to the second combo.

P.S. actually this is very primitive. You can use an xml file or access db to store your values, or even a txt file. But if it's a simple app with few data inputs then do it this way.

I have that all working already. I just need to add it so that I have
Panasonic - On - "CONFUSINGCOMMANDFORON"
Panasonic - Off - "CONFUSINGCOMMANDFOROFF"
I already have the second ComboBox sorted... apart from the second values..

Maybe the only way to do is loads and loads of IF statements? :(

Quote:

---

Originally Posted by Eminee

Righto.
So why would I need to add items with
ComboBox1.Items.Add(New CommandItem("ThisIsMyItem", "ThisIsMyCommand"))
If I have the structure... would it not be something like
ComboBox1.Items.Add(New CommandItem(DisplayText, Command))
??
I'm a bit confused :S Sorry.

---

What do you mean by "why"? The structures constructor takes two arguments; both strings. The first string is the string that will be displayed in the ComboBox, the second is the "command" associated with the item.
Is this not working for you?

Yeah.. sorry I was having a blonde moment there. I understand the code you gave me now.
I just can't seem to implement it with the code I already have, because of what I said above. :(

Quote:

---

Originally Posted by Eminee

... because of what I said above. :(

---

What is that exactly? I cant find make anything out of your last posts.

Well the code you gave me populates the combobox.. but I have already populated the combo box in my code through another combo box.
So I have a device combo box... which defines which options are displayed in the second combo box which is the command one. I define the commands when I define the devices.
So the when I use your code.. its just going to create another "ON" option... instead of adding the command to the existing one.
Does this make sense? :S

Could you show me the code you use to populate your combobox?

Quote:

---

Originally Posted by Eminee

Code:

---

  Public lists As New Dictionary(Of String, String())

---

Code:

---

        Me.lists.Add("Panasonic Projector", New String() {"On", "Off"})
        Me.lists.Add("Other Projector", New String() {"On", "Off"})
        Me.lists.Add("Other", New String() {"Choice1", "Choice2"})


        For Each key As String In Me.lists.Keys
            Me.comDevice.Items.Add(key)
        Next key

---

Code:

---

  Private Sub comDevice_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles comDevice.SelectedIndexChanged
        Me.comButton1.DataSource = Me.lists(CStr(Me.comDevice.SelectedItem))
    End Sub

---

---

This code..

Yes well now i'm also confused.
What are you trying to do. Please clarify it.
You say you have the panasonic etc values in combo1
You have the on-off etc values in combo2.
So?!
If you don't want to have multiple commands when you re visit the combobox, just search the items to find a match. Also if what i understand is correct, you want all the command to be added to the 2nd combobox?! So you have on,off,choice1,choice2 etc?! If so, you can do what i told you and erase the combo every time. Noone will understand the difference. Or if don't want to the populate a arraylist or the dictionary you have and take the values from there.
But other than that i can't think of what troubles you.

Yes, I have what you've said. But what I want is for the second box options to have a second value (I think thats what you'd call it).. so that when the panasonics "On" option, for example, is selected.. the string "%POWR 1" is used to send to the device to turn it on. I obviously don't want to put "%POWR 1" in the combo box because users won't understand what it does.

So.. the reason this is a problem is that I've already populated the second drop down box from the first one... so I can't then go and use Atheist's CommandItem code since it will just add another "ON" option.. instead of adding "%POWR 1" to the one which has already been created.

Is that any clearer? :S
Sorry I'm not being very clear.. I'm not good at explaining stuff. But thanks for both your help..

:wave:
Ok so you have your first combobox.
Assuming that you understand both my code and Atheist code and you can add 2 values into your combo, you do this:

When you first add the p.e. panasonic value you also add another value to your FIRST combo. Then when you select your panasonic value, you have already a collection that it has 3 elements, The 2nd value of the first combo and the 2 values you want to add to the second combo (on,#$rtffxxsomething) so you have to write some code in order to read the 2nd value from the first combobox and then find it on your collection. After that you add the 2nd(ON) and 3rd(!@#something) value to your 2nd combo (you can use the arraylist example i gave you). OK?

If you are still confused....Here is a map.

1st combo ----> Panasonic, 1
-----> Siemens,2
etc
collection
---->1,on,@#$asaz
---->1,off,%$%sda
---->2,choice1,$%%$44
etc.

arraylist ---->on,@#$asaz
---->off,%$%sda
---->choice1,$%%$44
etc.

So in combo2 you get the arraylist values you want and that's it.

Okay.. I'll give this a go now.

I take it I'm going to be using the Collection.Item property to find the correct index in the collection?

Yes most probably, if you have problems let me know. Although if i were at your shoes i would have used a dataset with 3 columns. But since you are trying this way. Go for it.

Okay... I tried it with a collection.. and it didn't like it because of the before and after properties? You can't have both?

Can all three of them be arraylists with their own structures? Thats how I've done it so far.
I'm guessing then I need a for each statement? So like

For each comDevice.SelectedItem in lists
blahblahblah

?

Except that doesn't work because the selecteditem is going to be Panasonic and not 1 :mad:

lol

Let me check something and i'll get back to you.

Okay, thankyou :)

Sorry, i was on an ebay auction.
So.
In order to get the values and let's get wild and add 3 values so you can have multiple options, you must rework on the structure.

Code:

---

Public Structure StructureGeneralComboHelper
        Private divName As String
        Private divName2 As String
        Private divID As Integer

        Public Sub New(ByVal name As String, ByVal name2 As String, ByVal id As Integer)
            divName = name
            divName2 = name2
            divID = id
        End Sub

        Public ReadOnly Property Name() As String
            Get
                Return divName
            End Get
        End Property

        Public ReadOnly Property Id() As Integer
            Get
                Return divID
            End Get
         
        End Property
        Public ReadOnly Property name2() As String
            Get
                Return divName2
            End Get
        End Property
    End Structure

---

So you can get 3 values. But how to get them?!
Well here is how:

Code:

---

  Dim myDivisions As New ArrayList
     
        With myDivisions
            .Add(New StructureGeneralComboHelper("ON", "$%F", 2))
            .Add(New StructureGeneralComboHelper("OFF", "%^3d", 2))
            .Add(New StructureGeneralComboHelper("Check1", "%77", 1))
            .Add(New StructureGeneralComboHelper("check2", "%%g", 1))
            .Add(New StructureGeneralComboHelper("SOMETHINGELSE", "%#f", 0))

        End With
        Dim sg As New StructureGeneralComboHelper
        For Each sg In myDivisions
            If sg.Id = "2" Then
                ' Found my Panasonic  value! Add it to the combo2 !
'
' code for adding...
'
            End If
        Next

---

Of course in the place of "2" you will have the value that you get from the first combo so you can add.
I think now it's easy?!

Any problems i'll check back in a couple of hours.(going out for coffee :) )

Yes.. I'd worked out that bit already.

I was just wondering

1. How you'd go about adding just one or two items of the array list to the combobox?
2. How to refer to the ID of the selecteditem in the combo box... since it won't let me put comDevice.SelectedItem.Id?
3. Why do I need the third array?

I should start paying you by the hour :P
I'm sorry >.<

Hi.
Your questions.

3) you don't need it. I put it to explain further. You need a 2 item arraylist.
1) You add the items to the combo with the code i gave you to posts #11 and #12
2)Ok your're right. How to you refer to the id's.
Put this code into the combobox selectedindexchanged event.

Code:

---

  Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
    Dim s As String = Me.ComboBox1.Items.Item(Me.ComboBox1.SelectedIndex).Name
    Dim v As Integer = Me.ComboBox1.Items.Item(Me.ComboBox1.SelectedIndex).Id


    End Sub

---

Where id and name are the variables you use on the structure.
Also in the .id variable you probably would want to make it string and put the "%$@43" variables.



Don't worry paying me, i'm rich :cool: ..Just kidding, although some reputation won't be bad :wave:

If you solved your problem then mark it as resolved.

Thankyou!
I have it all working now except the values are being added to the drop down box multiple times. Not sure why... must be something to do with my for loop?

Yes thats probably your LOOP.
If you don't find a solution then post the loop code.
But it's better to grind yourself a little to get some experience ;)

I find this easier, and simpler..
(Replace cbComboBox with the name of your combo box)

Code:

---

Public sList As New List(Of String)
Public sSplitChar As String = "~"
Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    sList.Add("value1" & sSplitChar & "value2")
    sList.Add("command" & sSplitChar & "name")
    cbComboBox.AddRange(sList.ToArray)
End Sub

Private Sub cbComboBox_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles cbComboBox.SelectedIndexChanged
    Dim iID As Integer = cbComboBox.SelectedIndex
    Dim sValue1 As String = sList(iID).Split(sSplitChar)(0) '(1) would be the second part
End Sub

---

That's fairly simple..

Cheers
Icyculyr

You mean " Cbcombobox.Items.AddRange(sList.ToArray)"

Well it's simple alright but it will have an "~" in the middle of the 2 names and you will also see the command id and i don't think Eminee would want that to happen.
And to get matters worst, what will happen if we have a value that instead of "value1" is named "Val~ue1"?. That's right, you will get "Val" as the value.

It's like getting a string and splitting it into parts.
Fairly simple but not very flexible.

Ah, forgot about that, then just do

Code:

---

For i As Integer = 0 To sList.Count-1
    cbComboBox.Items.Add(sList(i).Split(sSplitChar)(0))
Next i

---

You can change sSplitChar to anything you want, if you want something never used

Start -> All Programs -> Accessories -> System Tools -> Character Map, find an odd one and click it, click copy, and copy paste into Visual Basic...

Cheers
Icyculyr

Well i still think it's non flexible.
Also you must do cbcombobox.Items.Add(sList(i).Split(sSplitChar)(0))
to get it working.
And with the 2 combos that he wants he probably run into trouble with associating the values.
Anyway it's not my decision to use this or not so :)

Ya with the (0), I didn't read much of the problem, I just saw an idea in my head, and started typing..

EDIT:

Why does he want two combo boxes?

Cheers
Icyculyr

No problem mate :wave:

All done :D Hooray! Thanks so much for your help Sapator, I've learnt alot from this too since I'm quite new to the language. :)

And thanks Icyculyr for posting too :)

Good, i'm glad for you. :)