i've got two textboxes in my form.
According to title, when I write something in one textbox (a random one), i need that at the same time, in the other textbox a text (given in the code) appears.
1 letter for 1 letter
1)Example with random text:
1 textbox ) How are you?
2 textbox) Let's just c
2)Example with random text:
1 textbox ) What is the aim of the project?
2 textbox) Let's just chill out for a mome
thanks so much
You will need to determine which responses you would like to which questions. However, the tackle to letter for letter problem. I would use the substring method and get the length of the current text.
Dim Response as String = "Hello World!"
Private Sub Text(ByVal..) Handles Textbox1.changed
Textbox2.text = Response.Substring(0, Textbox1.text.length)
End Sub
As the text changes in the textbox you are typing in, this will output the response corresponding to the length of the text input. Since the event is textbox.changed, each character entered will update the second textbox
You need to use an event based code here. I would use a loop per stroke of the key and make the event "Key Press." Write the code onto the textbox you are inserting data into.
Related
Im working on a code in VB.NET wherein I scan a barcode(21 digit input) into a text box, and immediately, it’s supposed to show some data. I get the barcode input via a text box, which is supposed to contain the entire 21 digits, and I’m using the function textChanged() to see if the text box value has updated.
The problem is, the code runs after only the first value of the barcode gets read, and the rest of the values don’t reflect in the text box at all.
Is there any way I can get the entire 21 digits and then pursue the remainder of the code (note: it has to be automatic after the 21 digits are entered)
Code:
Private sub number_textChanged(sender as Object, E as EventArgs) handles number.TextChanged
If number.text.length =21 then
Value=number.text
End if
Send your textChanged() code, in that you can count then entered valued once reached 21 count then you can show 21 digit barcode. Or you can use textbox mouseout event, in that it will wait until you enter value fully, when you mouseout from textbox, it will trigger event.
Otherwise you can use javascript to get textbox value count and show after 21 digit.
function checklength() {
var len = document.getElementById("TextBox18").value.length;
if (len == 21) {
alert(document.getElementById("TextBox18").value);
}
}
and Textbox in source code add onkeyup event like this
<asp:TextBox ID="TextBox18" onKeyUp="checklenght()" runat="server"></asp:TextBox>
You can store that value in hidden value use in server side.
The code I use is the following:
' (is on top of the listing directly after Public class form1)
Dim Score as Integer
...
Score=Val(Txtbox5.text) "Txtbox5 is control where I put in the value."
Lbl2.text=score "Lbl2 is the label where the score must display."
Txtbox5.text="" "Makes the Textbox empty."
Then the problem occurs: when I enter a new value in Txtbox5.text the I want this value update
the value in the label with the value that is already in the label by the score.
The code I use therefor is Lbl2.text=score +score but whats happend is the score in the label is double???
So what I want is: when I have a value in the label say 2 and I insert a new value in the textbox
say 3 then I want to see in the label a value of 5.
But I have tried everything but nothing works
Is there somebody who can help me with this problem??
If I understand you correctly you want to sum the current value of the TextBox5 to the Score variable and then update the label
This could be simply resolved without any thinking with
Score += Val(Textbox5.Text)
Lbl2.text=Score
Txtbox5.Text=""
But you could meet some problems because in your textbox the user can type anything, not just a number. In that context the Val function from the Microsoft.VisualBasic compatibility assemble doesn't tell you anything, simply converts the non numeric string to zero. This could be acceptable or not depending on your requirements. If you want to have a message for your user when the input is not good you could write
Dim currentInput as Integer
if Not Int32.TryParse(Txtbox5.Text, currentInput) Then
MessageBox.Show("You should input a numeric value!")
Else
Score = Score + currentInput
Lbl2.text=Score
Txtbox5.Text=""
End If
I have tried everything but nothing works
That's not strictly true..
Lbl2.Text = (Convert.ToInt32("0"&Lbl2.Text) + Convert.ToInt32(Txtbox5.Text)).ToString()
ps;
Your life would be a lot simpler if you used a couple of numericupdown controls, one readonly and no border etc to look like a label. Then life would be like:
resultNumericUpDown.Value += inputNumericUpDown.Value
Whenever you're asking the user for numbers, using a NUD saves a lot of headaches
I would like some code which can:
Pick up a number that has been entered in a text box in a user form.
The text box is called Height
Thanks
You can get the value from the text box like this.
Dim heightInput = Height.text
However, you should do some validation before assuming it is a valid number.
such as
Dim validHeight as Integer
If int.TryParse(heightInput, validHeight) then
' Put code here
End If
for more
http://www.homeandlearn.co.uk/NET/nets1p14.html
I am working on a VB program for school. I am having some trouble extracting a substring from a string and I would really appreciate some help.
The form has different text boxes and one of them is where you type in a person's full name into one text box. The listbox on the form, when hitting the compute button, is supposed to display only the person's last name.
I am not sure how I am supposed to extract just the last name of the string of whatever name is typed into the text box.
All I got so far is:
Dim name As String
name = txtName.Text
(txtName is the name of the text box)
Okay, so I added:
lstOut.Items.Add(name.Substring(6))
That to my code. The name I typed in for an example when I ran the program was Helen Woods. 6 is in the substring because that is where the space starts and when I clicked compute, it listed only the last name, just like I wanted. But, this only works if the first name is five letters long. I need a way to make the program automatically find the space in between the two names.
EDIT:
When I add:
lstOut.Items.Add(name.IndexOf(""))
The listbox gives me a 0 whenever I type in a name and hit the compute button.
try this:
Private Sub GetLastName()
dim lsName as new List(Of String)
dim name as string
for each name in txtName.text.split(" ")
lsName.Add(name)
next
lstOut.items.Add(lsName.item(lsName.count-1))
end sub
You can call this procedure at your button event.
I has 4 item on my form.........
tow listbox ,one button and one text box
I has a listbox 'A' with many items.....
i need a item in a listbox 'B' from listbox 'A'
steps are as follow.....that i like to performe...........
1)enter a word or character in a textbox
2)press a button
3)the list appear in listbox 'B'.......that is character or string start in listbox 'A' that is we write in textbox (for matching)
i need a help in which a item that can be in listbox 'B' is getting for listbox 'A'
that is Starting string or character we enter in the text box.
please try to solve me out..........
Not quite sure I follow. Using the text box' Changed event would be a good trigger instead of a button. Just iterate the list items and check for a match with String.StartsWith. For example:
Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
ListBox2.Items.Clear()
If TextBox1.Text.Length > 0 Then
For index As Integer = 0 To ListBox1.Items.Count - 1
Dim txt = ListBox1.Items(index).ToString()
If txt.StartsWith(TextBox1.Text, StringComparison.CurrentCultureIgnoreCase) Then
ListBox2.Items.Add(txt)
End If
Next
End If
End Sub
I don't have an IDE in front of me, and it's been a while since I've done WinForms development, so I may not have the exact event name or other stuff, but you get the idea. This also means my code will be in C# since I'm more familiar with that, but you should be able to find the VB equivalent.
You'll want to bind to the proper event on the text box first. Maybe the KeyPress or KeyUp event? Or TextChanged? You want one that fires any time text changes in the text box. In that event, you'll loop through the items in listbox A and compare their values to the text in the text box. Basic string comparison is all that's needed, if there's a .StartsWith() or something of that nature, otherwise some basic use of .Substring() will do fine (based on the length of the string in the text box).
The loop would likely be something along the lines of:
listboxA.Items.ForEach(i =>
{if (i.StartsWith(textboxA.Text)) listboxB.Items.Add(i);});
Or...
foreach (var i in listboxA.Items)
if (i.StartsWith(textBoxA.Text))
listboxB.Items.Add(i);
Like I said, this is all off the top of my head, so the code may not be exact. But hopefully you get the idea.