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Jul 29th, 2021, 10:31 AM
#1
Thread Starter
Member
Need help with listbox texts to have a value and add onto another textbox
Basically, let's say in listbox1 I put a code staying listbox1.items.add(" lmao =$50")
Listbox1.items.add("xD = $30")
So, what I want is that when running this build when I select both of these on the list box I want a textbox to have the value 80 (50+30)
I can voice call on discord if required but I really need help to finish my assignment, I'm freaking out.
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Jul 29th, 2021, 10:44 AM
#2
Re: Need help with listbox texts to have a value and add onto another textbox
You will need to handle the SelectedValueChanged event to determine when the user has selected or unselected items. You can find documentation on this specific event here: https://docs.microsoft.com/en-us/dot...edvaluechanged
You will need to do a couple of things in the SelectedValueChanged event:
- Check if any items are selected
- If so, then loop over each item
- Get substring starting after the dollar sign
- Convert the substring to a number
- Add the result to a "total" variable
Here is a brief example:
Code:
Public Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox1.SelectedIndexChanged
Dim total As Double = 0
If (ListBox1.SelectedItems.Count > 0) Then
For Each item In ListBox1.SelectedItems
Dim dollarAmount = item.ToString().SubString(item.ToString().IndexOf("$") + 1)
total += CDbl(dollarAmount)
Next
End If
TextBox1.Text = total.ToString()
End Sub
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Jul 29th, 2021, 10:59 AM
#3
Thread Starter
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Re: Need help with listbox texts to have a value and add onto another textbox
I got like maybe 50% of that, I'll try it out and I just wanted to say thank you for taking the time out and trying to explain it. Is there anyway I could like stream and show you?
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Jul 29th, 2021, 11:09 AM
#4
Re: Need help with listbox texts to have a value and add onto another textbox
The tough part about trying to help people with homework is that the assignment is often designed for the student to make use of very specific concepts taught in that chapter, and previous chapters. Without the context of what you are learning, it is very likely that suggested code from people here would include concepts not yet taught, which could be a red flag to the instructor that the code wasn't written by you.
If your listbox is intended to have the text as written "Product = $Cost", then the assignment must expect you to store the prices in something like a separate parallel array to the listbox contents, since I doubt they would want you to do text parsing to extract the price from the listbox text itself.
Maybe it would help if you post the wording of the assignment and give a brief list of what topics have been covered in your class recently.
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Jul 29th, 2021, 11:14 AM
#5
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Re: Need help with listbox texts to have a value and add onto another textbox
Scenario
Chess Champions offer online training courses for beginners, and for players looking to
improve their ratings, which they sell direct to customers. They have asked you to create an
application to allow customers to purchase chess boards from them.
Customers must enter their Elo rating, so that they can be offered the most suitable
selection of training plans for their current level. An Elo rating is a number which indicates
the player’s current skill at the game: they range from 0 to 3000, and the higher the number,
the better the player. This must be entered before the plans are displayed. Once the Elo
rating has been entered, the training plan options should be displayed, only including
suitable plans for the given rating.
Customers must choose at least one of the training plans offered. For each course, they
may choose the option of online one-to-one tuition from an expert player, for an additional
cost. In addition, they may also choose from a range of optional items, including chess
books and luxury chess boards. If any of the optional physical items are selected,
customers must enter their full address. However, if customers only select an online training
course with no optional items, they will only need to enter their email address and credit
card details.
The list of courses, Elo rating range for each course, and their prices are shown below.
Course Name Elo
Range
Cost
for
course
Cost of
additional oneto-one tuition
Beginners: How to Play 0 –
100
£10
£50
Beginners: Opening Fundamentals 101 –
900
£20
Beginners: Middle Game Tactics 101 –
900
£20
Beginners: Finding Checkmate 101 –
900
£20
Intermediate: Winning Chess
Strategies
751 –
1500
£30
£150
Intermediate: Reading the Board 751 –
1500
£25
Advanced: Optimal Move Selection 1400+ £40
£300
Advanced: Play Like a GM 1400+ £50
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Jul 29th, 2021, 11:20 AM
#6
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Member
Re: Need help with listbox texts to have a value and add onto another textbox
Attachment 181942
basically when i click those i want the valur of it to show on the "total" textbox
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Jul 29th, 2021, 11:21 AM
#7
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Member
Re: Need help with listbox texts to have a value and add onto another textbox
Attachment 181943
thats the code i tried which is obviously wrong cause it just keeps on showing 0
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Jul 29th, 2021, 11:26 AM
#8
Re: Need help with listbox texts to have a value and add onto another textbox
Posting attachments here is flaky at best, and since code is just text, please copy and paste your code directly into this thread and use the "#" thread tool button to enclose your code in code tags so that it appears readable. Thanks!
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Jul 29th, 2021, 11:30 AM
#9
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Member
Re: Need help with listbox texts to have a value and add onto another textbox
Code:
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
ListBox1.Items.Add("Beginner: How to Play - £10")
ListBox2.Items.Add("Bobby Fischer Goes to War, by David Edmonds & John Eidinow, Paperback - £11.00")
ListBox2.Items.Add("Chess Fundamentals, by José Raúl Capablanca - £15.00")
ListBox2.Items.Add("Attacking the Strongpoint: The Philosophy of Chess, by Igor Zaitsev and Garry Kasparov - £20.00")
ListBox2.Items.Add("Luxury Glass Chess Set - £50")
ListBox2.Items.Add("Handcrafted Walnut Wooden Chess Set - £90")
End Sub
Private Sub Label4_Click(sender As Object, e As EventArgs)
End Sub
Friend WithEvents purbtn As Button
Private Sub purbtn_Click(sender As Object, e As EventArgs) Handles purbtn.Click
Dim sum As Integer = Val(ListBox1.SelectedItem) + Val(ListBox2.SelectedItem)
TextBox1.Text = sum
End Sub
Thank you for being so patient with me
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Jul 29th, 2021, 11:40 AM
#10
Re: Need help with listbox texts to have a value and add onto another textbox
The Val() function essentially looks at the first character passed to it and determines if it can be interpreted as a number. It isn't smart enough to take the text as a whole and do a deep dive to see if somewhere buried inside of the text is something numeric. Since the "SelectedItem" property of all the items in your listboxes start with words, it won't give you the price you are looking for.
So, you've got 5 items in ListBox2. Those items can be visualized as being contained in an array, where the indices of the items are 0 through 4, inclusive.
What you can do is create a separate array that contains the prices that correspond to the listbox data.
Example:
Code:
Dim prices2(4) As Integer
prices2(0) = 11
prices2(1) = 15
...
And so on.
Then, in your calculation, instead of using the ListBox's SelectedItem property, you use the ListBox's SelectedIndex property. So, if I highlight the top item in ListBox2, then the ListBox2.SelectedIndex = 0. You then use that .SelectedIndex as the index for the prices2 array. Highlighting the second item, the .SelectedIndex = 1, third item = 2, and so on.
If I highlight the "Bobby Fischer" book, the ListBox2.SelectedIndex = 0, and prices2(0) = 11, which is the price you are looking for.
I'll leave it up to you to piece the concepts together in code.
Good luck.
Last edited by OptionBase1; Jul 29th, 2021 at 11:46 AM.
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Jul 29th, 2021, 11:48 AM
#11
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
omg can i say I love you?
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Jul 29th, 2021, 11:49 AM
#12
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
Also another help i required was that i needed a label to read a text from a text file
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Jul 29th, 2021, 03:00 PM
#13
Re: Need help with listbox texts to have a value and add onto another textbox
Code:
Lanel1.Text = IO.File.ReadAllText(“path”)
Last edited by .paul.; Jul 29th, 2021 at 03:08 PM.
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Jul 29th, 2021, 03:37 PM
#14
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
thank you thank you, it worked!
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Jul 29th, 2021, 03:59 PM
#15
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
Originally Posted by OptionBase1
The Val() function essentially looks at the first character passed to it and determines if it can be interpreted as a number. It isn't smart enough to take the text as a whole and do a deep dive to see if somewhere buried inside of the text is something numeric. Since the "SelectedItem" property of all the items in your listboxes start with words, it won't give you the price you are looking for.
So, you've got 5 items in ListBox2. Those items can be visualized as being contained in an array, where the indices of the items are 0 through 4, inclusive.
What you can do is create a separate array that contains the prices that correspond to the listbox data.
Example:
Code:
Dim prices2(4) As Integer
prices2(0) = 11
prices2(1) = 15
...
And so on.
Then, in your calculation, instead of using the ListBox's SelectedItem property, you use the ListBox's SelectedIndex property. So, if I highlight the top item in ListBox2, then the ListBox2.SelectedIndex = 0. You then use that .SelectedIndex as the index for the prices2 array. Highlighting the second item, the .SelectedIndex = 1, third item = 2, and so on.
If I highlight the "Bobby Fischer" book, the ListBox2.SelectedIndex = 0, and prices2(0) = 11, which is the price you are looking for.
I'll leave it up to you to piece the concepts together in code.
Good luck.
Code:
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim prices1(0) As Integer
Dim prices2(4) As Integer
prices1(0) = 10
prices2(0) = 11
prices2(1) = 15
prices2(2) = 20
prices2(3) = 50
prices2(4) = 90
ListBox1.Items.Add("Beginner: How to Play - £10")
ListBox2.Items.Add("Bobby Fischer Goes to War, by David Edmonds & John Eidinow, Paperback - £11.00")
ListBox2.Items.Add("Chess Fundamentals, by José Raúl Capablanca - £15.00")
ListBox2.Items.Add("Attacking the Strongpoint: The Philosophy of Chess, by Igor Zaitsev and Garry Kasparov - £20.00")
ListBox2.Items.Add("Luxury Glass Chess Set - £50")
ListBox2.Items.Add("Handcrafted Walnut Wooden Chess Set - £90")
End Sub
Private Sub Label4_Click(sender As Object, e As EventArgs)
End Sub
Friend WithEvents purbtn As Button
Private Sub purbtn_Click(sender As Object, e As EventArgs) Handles purbtn.Click
If ListBox1.SelectedIndex = 0 Then
i did it till here, but im very lost as to how to add the prices cause as soon as i do that it says prices1(0) need to be declared even tho i did declare it
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Jul 29th, 2021, 04:02 PM
#16
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
I'm trying to code the button so that when i click it, the textbox will show the amount of whatever I had highlighted previously from the two listboxes
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Jul 29th, 2021, 04:15 PM
#17
Re: Need help with listbox texts to have a value and add onto another textbox
You declared the prices1 array as a local variable within the load method. By doing that, the array is not visible outside of the method. No other method can use it. To solve that, just move the declarations outside of the method. Generally, variable declarations are done prior to any method, but there's no rule that says it HAS to be that way.
So, you want to move:
Dim prices1(0) As Integer
outside of the method. It can be right before it, or higher up in the file prior to any other method. You should also change Dim to Private, though it really won't make any difference if you do. Dim is used for local variables, and works just fine for class level variables, but it would be better form to use Private. I always forget what Dim means (public, private, or friend) when not used on a local variable.
My usual boring signature: Nothing
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Jul 29th, 2021, 04:28 PM
#18
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
okay yeah that worked, but do i have to do each of the combos separately? like if i highlight the 1st one from the listbox1 and the 3rd one from listbox2 how do i make it so that it automatically does the calculation without me having to declare each one
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Jul 29th, 2021, 04:36 PM
#19
Re: Need help with listbox texts to have a value and add onto another textbox
Where’s your code that calculates values?
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Jul 29th, 2021, 04:43 PM
#20
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
Code:
ListBox1.Items.Add("Beginner: How to Play - £10")
ListBox2.Items.Add("Bobby Fischer Goes to War, by David Edmonds & John Eidinow, Paperback - £11.00")
ListBox2.Items.Add("Chess Fundamentals, by José Raúl Capablanca - £15.00")
ListBox2.Items.Add("Attacking the Strongpoint: The Philosophy of Chess, by Igor Zaitsev and Garry Kasparov - £20.00")
ListBox2.Items.Add("Luxury Glass Chess Set - £50")
ListBox2.Items.Add("Handcrafted Walnut Wooden Chess Set - £90")
End Sub
Private Sub Label4_Click(sender As Object, e As EventArgs)
End Sub
Friend WithEvents purbtn As Button
Private Sub purbtn_Click(sender As Object, e As EventArgs) Handles purbtn.Click
Dim prices1(0) As Integer
Dim prices2(4) As Integer
prices1(0) = 10
prices2(0) = 11
prices2(1) = 15
prices2(2) = 20
prices2(3) = 50
prices2(4) = 90
If ListBox1.SelectedIndex = 0 Then
TextBox1.Text = prices1(0)
End If
If ListBox2.SelectedIndex = 0 Then
TextBox1.Text = prices2(0)
End If
If ListBox1.SelectedIndex = 0 And ListBox2.SelectedIndex = 0 Then
TextBox1.Text = prices1(0) + prices2(0)
End If
i can do it one by one but there are so many possibilities and its so much grunt work, I'm sure there's an easier way
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Jul 29th, 2021, 04:46 PM
#21
Re: Need help with listbox texts to have a value and add onto another textbox
You’ve just got to loop through each listbox, then each listbox’s items
Code:
Dim listBoxes() As ListBox = {ListBox1, ListBox2, ListBox3}
For x As integer = 0 to listBoxes.GetUpperBound(0)
For y As integer = 0 To listBoxes(x).Items.Count - 1
‘Put your summing code here
Next
Next
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Jul 29th, 2021, 04:50 PM
#22
Thread Starter
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Re: Need help with listbox texts to have a value and add onto another textbox
I tried really hard to get that but alas I failed miserably
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Jul 29th, 2021, 04:53 PM
#23
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
Originally Posted by .paul.
You’ve just got to loop through each listbox, then each listbox’s items
Code:
Dim listBoxes() As ListBox = {ListBox1, ListBox2, ListBox3}
For x As integer = 0 to listBoxes.GetUpperBound(0)
For y As integer = 0 To listBoxes(x).Items.Count - 1
‘Put your summing code here
Next
Next
what is my summing code? listbox1.selectedindex + listbox2.selectedindex? how would they know what the prices are? as you can see im horribly new at this and really bad at this too
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Jul 29th, 2021, 04:58 PM
#24
Re: Need help with listbox texts to have a value and add onto another textbox
Instead of Arrays, Datatables would be better…
Code:
Dim dt1 As New DataTable
dt1.Columns.Add(“itemName”)
dt1.Columns.Add(“price”, GetType(Decimal))
dt1.Rows.Add(“first item”, 10)
dt1.Rows.Add(“second item”, 20)
dt1.Rows.Add(“third item”, 30)
ComboBox1.DisplayMember = “itemName”
ComboBox1.ValueMember = “price”
ComboBox1.DataSource = dt1
ComboBox1.SelectedIndex = 1
Msgbox(ComboBox1.SelectedItem.ToString)
Msgbox(ComboBox1.SelectedValue.ToString)
The Msgboxes will show “second item” and “20”
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Jul 29th, 2021, 05:05 PM
#25
Re: Need help with listbox texts to have a value and add onto another textbox
Originally Posted by .paul.
Instead of Arrays, Datatables would be better…
Code:
Dim dt1 As New DataTable
dt1.Columns.Add(“itemName”)
dt1.Columns.Add(“price”, GetType(Decimal))
dt1.Rows.Add(“first item”, 10)
dt1.Rows.Add(“second item”, 20)
dt1.Rows.Add(“third item”, 30)
ComboBox1.DisplayMember = “itemName”
ComboBox1.ValueMember = “price”
ComboBox1.DataSource = dt1
ComboBox1.SelectedIndex = 1
Msgbox(ComboBox1.SelectedItem.ToString)
Msgbox(ComboBox1.SelectedValue.ToString)
The Msgboxes will show “second item” and “20”
Right, and the chances that those concepts have been covered in class and expected to be used in the assignment are essentially 0. Which goes along with the point I made in my first post.
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Jul 29th, 2021, 05:13 PM
#26
Re: Need help with listbox texts to have a value and add onto another textbox
In my previous code, replace ComboBox with ListBox
You’d use a new DataTable for each listbox. The itemName column is what you see in the listbox. The price column is what you will be using for the summation. Do you have multiselect in your listboxes?
Code:
Dim listBoxes() As ListBox = {ListBox1, ListBox2, ListBox3}
Dim total as decimal = 0D
For x As integer = 0 to listBoxes.GetUpperBound(0)
For y As integer = 0 To listBoxes(x).SelectedItems.Count - 1
‘Put your summing code here
total += cdec(listBoxes(x).SelectedValues(y))
Next
Next
Msgbox(total.ToString(“c2”))
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Jul 29th, 2021, 05:19 PM
#27
Thread Starter
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Re: Need help with listbox texts to have a value and add onto another textbox
yes I have multiselect enabled. Is there anyway you could join a call with me? teams or messenger so i could share my screen
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Jul 29th, 2021, 05:27 PM
#28
Re: Need help with listbox texts to have a value and add onto another textbox
Ok, just using ListBoxes and parallel arrays…
Code:
Dim prices1(0) As Integer
Dim prices2(4) As Integer
prices1(0) = 10
prices2(0) = 11
prices2(1) = 15
prices2(2) = 20
prices2(3) = 50
prices2(4) = 90
Dim allPrices(1)() As Integer
allPrices(0) = prices1
allPrices(1) = prices2
Dim listBoxes() As ListBox = {ListBox1, ListBox2}
Dim total as integer = 0
For x As integer = 0 to listBoxes.GetUpperBound(0)
For y As integer = 0 To listBoxes(x).Items.Count - 1
‘Put your summing code here
If listBoxes(x).IsSelected Then
total += allPrices(x)(y)
End If
Next
Next
Does that work how you’re hoping for? It sums all values Of selected items in listbox1 then all values of selected items in listbox2. If that’s not what you’re looking for, the code will have to be modified
Last edited by .paul.; Jul 29th, 2021 at 05:34 PM.
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Jul 29th, 2021, 05:29 PM
#29
Re: Need help with listbox texts to have a value and add onto another textbox
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Jul 29th, 2021, 05:33 PM
#30
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
'IsSelected' is not a member of 'Listbox'
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Jul 29th, 2021, 05:36 PM
#31
Re: Need help with listbox texts to have a value and add onto another textbox
Code:
If listBoxes(x).Items(y).IsSelected Then
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Jul 29th, 2021, 05:37 PM
#32
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
Originally Posted by .paul.
Ok, just using ListBoxes and parallel arrays…
Code:
Dim prices1(0) As Integer
Dim prices2(4) As Integer
prices1(0) = 10
prices2(0) = 11
prices2(1) = 15
prices2(2) = 20
prices2(3) = 50
prices2(4) = 90
Dim allPrices(1)() As Integer
allPrices(0) = prices1
allPrices(1) = prices2
Dim listBoxes() As ListBox = {ListBox1, ListBox2}
Dim total as integer = 0
For x As integer = 0 to listBoxes.GetUpperBound(0)
For y As integer = 0 To listBoxes(x).Items.Count - 1
‘Put your summing code here
If listBoxes(x).IsSelected Then
total += allPrices(x)(y)
End If
Next
Next
Does that work how you’re hoping for? It sums all values Of selected items in listbox1 then all values of selected items in listbox2. If that’s not what you’re looking for, the code will have to be modified
well basically i want any highlighted items in listbox1 to be added with any highlighted items in listbox2 when a button is pressed in a textbox so, yes
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Jul 29th, 2021, 05:40 PM
#33
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
Originally Posted by .paul.
Code:
If listBoxes(x).Items(y).IsSelected Then
theres an error in this line when i try and press the button to sum the highlighted items "If listBoxes(x).Items(y).IsSelected Then" saying
System.MissingMemberException: 'Public member 'IsSelected' on type 'String' not found.'
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Jul 29th, 2021, 05:48 PM
#34
Re: Need help with listbox texts to have a value and add onto another textbox
Sorry, i was typing that on my phone. I tested it on my workstation now...
Code:
Dim prices1(0) As Integer
Dim prices2(4) As Integer
prices1(0) = 10
prices2(0) = 11
prices2(1) = 15
prices2(2) = 20
prices2(3) = 50
prices2(4) = 90
Dim allPrices(1)() As Integer
allPrices(0) = prices1
allPrices(1) = prices2
Dim listBoxes() As ListBox = {ListBox1, ListBox2}
Dim total As Integer = 0
For x As Integer = 0 To listBoxes.GetUpperBound(0)
For y As Integer = 0 To listBoxes(x).Items.Count - 1
'Put your summing code here
If listBoxes(x).SelectedIndices.Contains(y) Then
total += allPrices(x)(y)
End If
Next
Next
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Jul 29th, 2021, 06:01 PM
#35
Re: Need help with listbox texts to have a value and add onto another textbox
All of the prices in prices1 have to be relevant to their parallel item in ListBox1
All of the prices in prices2 have to be relevant to their parallel item in ListBox2
allPrices is an array of arrays, the first element contains prices1, the second element contains prices2
listBoxes is an array of listboxes
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Jul 29th, 2021, 06:05 PM
#36
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
Originally Posted by .paul.
Sorry, i was typing that on my phone. I tested it on my workstation now...
Code:
Dim prices1(0) As Integer
Dim prices2(4) As Integer
prices1(0) = 10
prices2(0) = 11
prices2(1) = 15
prices2(2) = 20
prices2(3) = 50
prices2(4) = 90
Dim allPrices(1)() As Integer
allPrices(0) = prices1
allPrices(1) = prices2
Dim listBoxes() As ListBox = {ListBox1, ListBox2}
Dim total As Integer = 0
For x As Integer = 0 To listBoxes.GetUpperBound(0)
For y As Integer = 0 To listBoxes(x).Items.Count - 1
'Put your summing code here
If listBoxes(x).SelectedIndices.Contains(y) Then
total += allPrices(x)(y)
End If
Next
Next
I think it worked cause its not crashing anymore but it isnt showing the supposed total in the textbox1
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Jul 29th, 2021, 06:08 PM
#37
Re: Need help with listbox texts to have a value and add onto another textbox
Originally Posted by .paul.
All of the prices in prices1 have to be relevant to their parallel item in ListBox1
All of the prices in prices2 have to be relevant to their parallel item in ListBox2
allPrices is an array of arrays, the first element contains prices1, the second element contains prices2
listBoxes is an array of listboxes
How many items do you have in listbox1?
What should be the total, and what is it showing?
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Jul 29th, 2021, 06:12 PM
#38
Re: Need help with listbox texts to have a value and add onto another textbox
After the loops, you should have something like...
Code:
TextBox1.Text = total.ToString("c2")
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Jul 29th, 2021, 06:18 PM
#39
Thread Starter
Member
Re: Need help with listbox texts to have a value and add onto another textbox
Originally Posted by .paul.
After the loops, you should have something like...
Code:
TextBox1.Text = total.ToString("c2")
OMG OMGOMG OMGOMG I LOVE YOU MAN! it worked so frikkin good! theres like a few more things i need help with still and is there anyway i could remove the $ thats showing before the total? or make it so that it shows £ instead?
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Jul 29th, 2021, 06:31 PM
#40
Re: Need help with listbox texts to have a value and add onto another textbox
Code:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Threading.Thread.CurrentThread.CurrentCulture = New CultureInfo("en-GB")
End Sub
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