I have an Ajax ModalPopUpExtender which works fine when launched by the target control, but what I want to do is launch it from a server side Button_Click event in VB.
This is because I want to check some variables before launching the ModalPopUpExtender.
I have tried the .show method which works fine on an initial PageLoad event when there is no post back, but the method won't work from an asp:button's onclick event or from a post back event.
I have given the ModalPopUpExtender a dummy button to target as you can't run one without the TargetControlID being set. The dummy control is visible.
As the .show method works on a PageLoad event I know the ModalPopUpExtender is set up correctly, but what could be stopping it from running from a server-side event?
Here's my code:
<ajax:ModalPopupExtender
ID="mp1"
runat="server"
PopupControlID="Panel1"
TargetControlID="btnShowPopUp" CancelControlID="btnClose"
BackgroundCssClass="modalBackground">
</ajax:ModalPopupExtender>
Sub btnShow_Click(ByVal sender As Object, ByVal e As EventArgs)
if myVariable = 1 then
mp1.show
End if
End Sub
After searching on more permutations of my question I finally found the answer in an existing answer on the site. The target control has to be a hidden field object, not another button.
The full answer is at:
ASP.NET: ModalPopupExtender prevents button click event from firing
Related
I've come across a peculiar focusing issue. I have created the following "search" program:
It runs in the background.
When you double-tap the Ctrl key it becomes visible.
You can type in the textbox because the form has focus.
If the form loses focus (I click on my desktop, for example), it disappears after 3 seconds.
I double-tap the Ctrl key again, and again it becomes visible.
But this time, no matter what I try, the form is not focused and I cannot type in the textbox without first manually clicking on the form.
What's particularly interesting is that when I run this program in debug mode from Visual Studios, the program regains focus upon double-tapping Ctrl key and becoming visible, and I can immediately start typing in the text box. However, when I build this program and run it alone, the program appears but does not regain focus upon double-tapping Ctrl key, and therefore I cannot type in the text box until I manually click the form.
After Me.Show() I have tried:
Me.Focus()
Me.Validate()
Me.Select()
Textbox1.Select()
Textbox1.Focus()
The form is topmost and normally running in administrator, but the same problem arises regardless.
The issue can be recreated in a more simple manner. Create a form with
Button ("Button1")
TextBox
Two timers ("hideForm", "showForm") both with intervals of 1000
Code:
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
hideForm.Start()
sender.Enabled = False
End Sub
Private Sub hideForm_Tick(sender As Object, e As EventArgs) Handles hideForm.Tick
Me.Hide()
hideForm.Stop()
showForm.Start()
End Sub
Private Sub showForm_Tick(sender As Object, e As EventArgs) Handles showForm.Tick
showForm.Stop()
Me.Show()
Me.Activate()
End Sub
End Class
Click the button, and immediately click on a different window (so the form loses focus). Wait until the form is hidden and shown again. The textbox should have focus. Try typing.
If the program is run in debugging mode in Visual Studios, it works as expected. If you build the program and run it outside of VS, the form will reappear without focus, and you cannot type in the textbox without manually selecting the form.
Sorry for the long-winded explanation. It's a difficult issue to properly describe.
Try the form event handler Activate. Inside that method, you can use setFocus to gain focus for that particular Text Box. I know this answer is too late. But hope this helps someone.
Private Sub Form_Activate()
TextBox1.SetFocus
End Sub
Try an event handler for Form_Activate, and within that handler pass the focus to your textbox.
Instead of Focus, you can also try TextBox1.Select. This SO link provides some additional information and something about the difference between Focus and Select.
Select the Textbox you want to assign a focus to in the Design View Window.
Under the Properties window, set the TabIndex to 0 (zero).
I didn't even have to use the TextBox1.Focus() command. It still bothers me that the TabIndex overrides the Focus command.
What I tried (and worked for me), was to set the Focus() of the Textbox in the event handler Shown() [VB]:
Private Sub Form1_Shown(sender As Object, e As EventArgs) Handles MyBase.Shown
Me.Textbox1.Focus()
End Sub
Note: the Select() method just didn't do the job. I hope this helps anyone else that comes with this same issue.
My form is displayed as TopMost on my application. The problem I have is that whenever I minimize my application or it loses focus, the form remains displaying. I want to be able to minimize my application or move to another and also hide or close my form. Once the application regains the focus, then unhide or open the form again.
Here is what I worked out on the form's closing event:
Private Sub frmNavigation_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
Static Minimize As Boolean
If Minimize = True Then
e.Cancel = True
Me.Hide()
End If
End Sub
I tried using the same code in the applications WindowDeactivate event but nothing happens.
You do not show how you create the instance of your frmNavigation. I am assuming that you are using the Show Method, so just use the version of Show that you pass in the top level window. That will assign the owner of the form, it will then stay on top of your Main Form and minimize and restore with it also. If this doesn't work please show how you are creating and showing your form.
frmNavigation.Show(Me)
I was able to find an answer to the question. MSDN had an article on this very issue.
it can be found here: http://support.microsoft.com/kb/186908#appliesto
I want to update a database based on the form that is currently activated. I had originally decided to use the GotFocus event. However I now understand that will not work as the form has controls on it. So I then thought I wouls use the activated event. This works but seems to fire multiple times. I put in the following code:
Private Sub frmNewTicket_Activated(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Activated
MsgBox("Form Activated")
End Sub
I select the form and make it activated and the message box appears about 15 times.
Why does it do this? How should I handle this. I only want my code to execute once when the form is activated.
NOTE: There are several forms that the users will be changing between, incuding forms from other applications.
Each time you click OK on the messagebox, the form regains the focus and is activated again.
Put a static Boolean value in your frmNewTicket_Activated like someone has posted here:
Static HasRan As Boolean=False
If Not HasRan Then
HasRan=True
'put code here
End If
It sounds like you are wanting to do something everytime your form gets activated. The Form Activated event will work fine as long as what you are doing doesn't pull focus from the Form which will then trigger another Activation event when the Form gets focus again. Try using something other than a MessageBox for testing like Beep or changing the Form's Color
Please allow me to explain what I have and what I am trying to achieve.
I have a textbox (called txtb1) and a button under it (called btn_browse) on a winform in a vb.net project.
When the user clicks the button a folder browser dialog appears. The user selects his desired folder and when he/she clicks 'ok' the dialog closes and the path of the folder selected appears in the textbox. I also want to store that value in a variable to be used somewhere else(the value will be copied to an xml file when the user clicks 'apply' on the form, but this has no effect nor is related to my problem).
To achieve that I have the following code:
Public myVar As String
Private Sub btn_browse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_browse.Click
Dim f As New FolderBrowserDialog
If f.ShowDialog() = DialogResult.OK Then
txtb1.Text = f.SelectedPath
End If
myVar = txtb1.text
f.Dispose()
End Sub
This part works with no problems.
Now, what if the user either:
1- decides to enter the path manually rather than use the browse button. or,
2- after using the browse button and selecting the folder they decide to manually change the location
In trying to solve this I added a textchanged event to the textbox as follows:
Private Sub txtb1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtb1.TextChanged
myVar = txtb1.Text
End Sub
However, this is not working. Apparently, and I don't know if this is relevant, when the user selects the desired folder using the browse button the textchanged event is also triggered. and when I click on the textbox (to give it focus) and press any keyboard key the application simply stops responding.
So my questions are: am I going about this the right way? if my logic is flawed, could someone point me to how usually such a thing could be achieved? is it possible to limit the triggering events to only keyboard input as a way around this? I tried the keydown and keypress events but I am getting the freeze.
Set the TextBox.ReadOnly property to true and then set the backcolor to white and forecolor to black to look like a normal textbox but they can't edit it.
Then you have no need to worry about handling any events from the textbox like u are doing.
I think your solution is pretty simple. Just treat the textbox as a File upload control in web forms. Make it readonly. Don't let the users to edit the text. This solves two problems:
The user will always a select a folder using a known mechanism (clicking on button and seleting folder)
No need to use any variable since you can always get the location from the textbox.
HTH
Why do you need to store this value in an additional variable? So long as the textbox is visible to the user, it contains the definitive value and could be accessed directly. So, in this case you would have clicking the "Apply" button read the value from the text box instead of the variable, thus avoiding this problem with events altogether.
I'm trying to load up a YouTube page using Visual Studio 2008 and a very simple Visual Basic project that contains just a WebBrowser. I want to load the page when the form loads:
Private Sub Form1_Load(ByVal sender As Object,
ByVal e As System.EventArgs) Handles Me.Load
WebBrowser1.Navigate("http://code.google.com/apis/youtube/js_example_1.html")
End Sub
Every now & then (occurs once every 3-5 times, but varies), the form just shows a blank white box.
Could someone help me understand why this happens please.
Edit: This 'freeze' happens for any page, such as http://www.google.com. Is my WebBrowser control broken? Only seems to happen when i place the navigate code in the Form Load event, hmmm strange.
This is probably (almost certainly) happening because a form's Load event occurs before its first Paint event, so once in awhile the WebBrowser finishes navigating to Google (or wherever) before the form paints itself the first time, and thus the WebBrowser shows up as just a white box.
A very simple solution to this problem is to just put a Timer control on the form with a short Interval (say, 100 ms), set Enabled to true, and in its Tick event disable the Timer and then call Navigate(...) on your WebBrowser.