Detect Textbox Change?
May 7, 2012
The Textbox_TextChanged event fires when a key is pressed or when text is pasted while cursor is in a text box.
Is there an event that fires on Textbox1.text="NewText"? How do I detect this?My reason for doing this is I would like to reformat text property automatically on assignment rather than do something like textbox.text=myreformat("Newtext").I can put code in validating or validated event but then I'd have to force focus/lostfocus to trigger one of those events.
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Dec 13, 2011
how can I detect if press Enter in the Textbox Change event and not in Textbox Keypress?
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Feb 1, 2009
I want to be able to detech when a text box changes, this is populated from another application the text box is [code]What I would like to be able to do is detect when this changes from 0-1 and 1-0 so I can log this to my text file, the code for that is below.[code]
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Apr 16, 2012
I have a Treeview in a form. I can add a child node, delete nodes, shift a child node by creating a subfolder in the Treeview and also change text of any child node.
How can I determine programmatically, whether one of these events/changes was occur?
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Apr 4, 2009
Working with detailed forms that is displaying a row form a table adapter, is it possible to detect that a change has been made to a database field when the form is closed?
I.e. if a change has been made I need to ensure that an update is performed before the form actually closes.
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Jan 7, 2011
I need to be able to detect when the background changes, for example user right clicks and selects next background, My first thought was using a FileSystemWatcher on the folder where the images are kept to detect when windows reads a image but that didn't work with the filter to last access but it doesn't seem to be working even when i run as administrator
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Jul 22, 2009
How to create a program that detects the screen resolution and change it to 1280x800 or 1024x768? What are the computer requirements to support each of these resolutions. (I don't want for the program to request the user as programs do this especially in Windows Vista, because my program will be created for Windows Vista).
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Aug 21, 2010
I'm trying to figure out some simple code to detect when a single pixel changes color at a location I choose -anywhere- on the screen (ex. 100,100). Maybe with just a msgbox popup when it changes.
The visual basic program will just be hidden and running in the background.
I should be able program the rest of the program around it, I just need the detection part. That is where I am stumped.
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Mar 10, 2010
for example:
im viewing a web page, and it changed to blue...(bg color was white)
is it possible for vb to monitor this?
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Nov 12, 2011
I am writing an application on Windows-7 using Visual Basics 2010. I am accessing System Date with
Dim today As Integer
today = Format(Now, "dd")
Well, that works fine. But I need some indication/notification when system date changes, so that I can retrieve the new date.
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Jun 16, 2011
I'm creating a basic text editing program that will be used for UCAS Personal Statements (probably not a unique idea but hey). It will be a basic text editor with no special text formatting to sit in line with the guidelines of UCAS (there is a character limit for personal statements).
What I want to do is have a save/load option (which is easy enough), however on the "Exit" function I want the program to detect text changes and alert the user that saving is recommended (ya know like when you close word and it asks if you want to save blah blah blah)
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Jan 11, 2012
VB 2010
Is there an event generated when you plug in or remove screens/monitors. I know you can keep checking but wondered whether there was an event generated.?
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May 15, 2012
iam using the below code to check text change in clipboard but its not supported with unicode chracters like ا ب ج is there any way to add support for unicode text or is there any other way to do same work?
#Region " Definitions "
'Constants for API Calls...
Private Const WM_DRAWCLIPBOARD As Integer = &H308
[Code]....
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Jun 22, 2010
Is there a event detect change of Listview item count? Like it will be trigger whenever i add an item or delete an item form listview. I search on MSDN Listview Event member, but cant c any usefull.
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Sep 14, 2011
The purpose of the code below is to scan a program of mine to detect a pixel color change. It loops through until a change is detected. It works fine for about 10-15 seconds and then I get an ArgumentException was unhandled error. So far this has happened on two different lines at separate times...
Image = New Bitmap(Rec.Right - Rec.Left, Rec.Bottom - Rec.Top)
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Sep 26, 2011
I have a question about event handling. Is it possible to detect field level data change in vb.net? i don't want my codes to be dependent on the the bound control's event to detect the change on the field value. I'm thinking there must be a better way (coming from a Delphi background). For example: a change on the Qty field will automatically trigger the event to compute the invoice detail Amount - (pseudo-case sample: Amount = Qty * UnitPrice).
In Delphi, every field is treated as an object with its own properties and events. So it's very easy to associate an event with it.
Example:
procedure TfrmInvoice.qryInvDetQtyChange(Sender: TField);
begin
inherited;
qryInvDetAmount.value := qryInvDetQty.AsInteger * qryInvDetUnitPrice.AsCurrency;
end;
How can I achieve the same using vb.net?
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May 11, 2010
I'm using VB Express 2008 and I want tto write a simple code.
[Code]...
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Nov 19, 2010
I am new to Visual Basic and i am using VS 2008. I have a form with multiple (7) text boxes. What i would like to accomplish is basically, when i click on textbox 1 a predefined message would load to label1 and when i click on textbox2 label1 would now displays a different pre-defined message and etc... I've tried using the "focus" parameter of the textbox but it doesn't work. So i am thinking of using the cursor as a way to solve my problem but i don't know how to work with it. I found a very similar thread titled " Detect when the cursor is in a textbox/typing in webbrowser?" on this forum but i don't think it applies to my situation.
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Dec 28, 2010
I've got a couple of instances of a user control on a flowlayoutpanel. The user control has got a couple of controls on it, and very little / almost none of the control's original space is visible. I need to know when the mouse is inside the usercontrol. What then happens is that the border color changes (of a control in the user control), and when it leaves the control, it changes back to original state.
I tried the following:
Private Sub ctrDashboardWidgetFrame_MouseEnter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.MouseEnter
Try
ShowControls()
Catch ex As Exception
[Code] .....
And it works, but it only works when you move over the original visible space of the user control, and doesn't work when you move over the child controls inside the user control. How I'll be able to achieve this to also work while the user is inside the full user control and not just it's visible space?
dp.SyntaxHighlighter.ClipboardSwf = '/dp.SyntaxHighlighter/Scripts/clipboard.swf'
dp.SyntaxHighlighter.HighlightAll('c7f9624a181a409ebf7e3e1f57df5ce8')
[URL]
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May 7, 2012
What I have: 1 OpenFileDialog, 1 PictureBox, 2 TextBox's This is what I got so far, but I'm just stuck on how to have the width of the image automatically detect and put the images width in pixels in TextBox1, and the height in TextBox2.
Public Class Form1
Private sizew As Integer
Private sizey As Integer
[code]....
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Apr 19, 2011
If this is a stupid question, then let me know. I can't just figure it out.First of all, this is my question. How do I detect the changed value on those text boxes?I have an idea that I create a another string values that have the original values and compare them right before saving or form closing event. This sample just have 3 text boxes, but I have 50 + text boxes on my one form. I can do it that way, but that is not really smart idea.Can I use abcDB.SubmitChanges() to detect any data changes on text boxes?
Dim sqlQuery = (From obj in abcDB.HelloWorld
Select obj.Fname, obj.Lname, obj.PhoneNumber).FirstOrDefault()
me.textboxFname.text = sqlQuery.Fname
[code].....
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Mar 21, 2011
I am fairly new to visual basic and have written this program to detect a change in a selected pixel on the screen. When the pixel changes, a sound plays every x seconds. It works fine but after a few hours of operation a possible memory leak causes it to either crash the program or the PC. I have watched the process and I can see 4k added to it every 4 seconds or so. Where this memory leak is coming from?
Here is the code:
Public Class Main
Public pointx As Long
Public pointy As Long
Public areaselected As Integer
Public TimeToPause, SecondTimer, changefound As Integer
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Dec 15, 2011
I have a DGV I am working on, and I have many columns.
For example I have Columns colcase(Combobox), colreportTime(Time)
the combox shows 4 cases {A,B,C,D}
what I need to do is if the user select "C"
the the colreporttime will show the time of this change unless the old value is C
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Jan 5, 2012
I have a TextBox with a list of filenames in it. The user is able to change these file names, but I don't want them to enter invalid characters, such as slashes or question marks.
I've tried two approaches, but they are not satisfactory:
1. Detect the key pressed with the KeyDown event:
Use e.KeyValue to detect keys like Keys.Oem5 (= backslash), then use 'e.SuppressKeyPress = True' to suppress the key.Problem is, with different Keyboard layouts, The Oem5-key isn't always a backslash.
2. Filter the text:
Use the TextChanged event and do a Replace("", "") on the text for every invalid character (there's 9 of them).Of course this will create 'lag' with every keystroke, especially if there's a lot of text. Also the text-cursor and scrollbar will jump back to the top-left when using Replace.
In short: I'm looking for a way to detect the character that is being entered and suppress or remove it when invalid.
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Sep 29, 2009
How can I detect if a text is pasted in a textbox (and not typed?)
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Mar 28, 2010
I'm using a custom webbrowser to display a special intranet for my company.I need to be able to display a custom keyboard whenever the user can type in the webbrowser. So if they click on a textbox within the page to type, this custom keyboard appears.when the user is in 'typing mode'. I thought maybe checking when the cursor changes to 'ibeam' which is the typing cursor? How might I do that, or is there an easier way?
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Feb 26, 2011
I want to detect when the user has changed the content of a Textbox.
The following does not work for me, because: When the user navigates through the database (using my navigation buttons), the textbox is also changed, but NOT by the user making input. I would only like to know when the user EDITED the Textbox.
Private Sub mskStudentNumber_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles mskStudentNumber.TextChanged
If Not Movement Then '' If not navigation
[Code]....
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Dec 2, 2009
whats wrong with my code?if i change the item from the combo box..the textbox not change or has an error?
conn = New MySqlConnection()
conn.ConnectionString = "server=localhost; user id=root; password=12345; database=gigzta; allow zero datetime=no"
strsql = "SELECT accNo FROM accinfo WHERE (completename LIKE '%" & ComboBox2.Text & "%')"[code].....
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Jul 23, 2011
When you you right click on a textbox the context menu is automatically open.
I have put a textbox inside a relatively complex user defined user control.
The annoing thing is that when I try to open the context menu with a rightclick the context menu is open but it shuts down soon after.
I tried to see if the mousedown or mouseUp of my (preview and not) usercontrol could interfere with this but i did not find anything.
Is there any trick that I can use to see what forces my context menu to close soon after is open?
Is there something in Vb2008 that allows me to see the steps widthout using breackpoints
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Feb 28, 2011
I have some textboxes bound to a bindingsource and bindingnavigator.
I want to detect when the values have changed and prompt the users to confrim if they want to update.
When the form is first initalised and when then binding navigator moves to the next record the text_changed event fires on textbox where I have a boolean to determine if things have changed.
Is there a way to set my boolean only when valid data changes have occured or a better way to detect if things have changed
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