ComboBox Problem - Combo Box Won't Drop Down After Cancelling Validation?
Feb 24, 2012
I've found some unexpected behaviour in my ComboBox, which I'm hoping someone can help me with. If focus is lost by pressing the Return key on a form which has AcceptButton set, then after handling the Validating event and cancelling the validation,the ComboBox will not drop down any more. When you click on the drop-down arrow, the list drops down momentarilly then goes away again To reproduce this, create a new VB.NET Windows Forms application. Drop a Combo Box and a Button onto the default form, then add the following code:[code]....
Run this application, click on the Combo Box, enter some random text (e.g. "asdf"), then press Return. After this, click on the drop-down arrow on the Combo Box.I'm using Visual Basic 2010 Express on Windows 7 Home Premium.
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Feb 21, 2012
How to use a databound combo box to display one field in the drop down, and another as the combo box text on roll up? Using VS 2005... For example, I have a datatable that has 2 fields. One called "ShortDesc" and one called "LongDesc". I want to be able to see the "LongDesc" column values in the drop down on the combo box. When I make a selection, I want the text in the combo box to read the corresponding "ShortDesc" value.
[Code]...
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Jun 10, 2010
I want to VALIDATE Image Combo control just like the one that is in CommonDialog control. Now I have to choices:1. Put validation routine in Click Event, it works fine if I only use mouse, but if I use keys (Arrorw, PgDn-PgUp, Home-End, etc) Click Event is invoked.2. Put validation routine in Validate Event, perfect; but I will work until when focus is moved to other control.How CommonDialog Image Combo does work? I can open it with mouse click or with F4, then I can move across options with mouse or keys and, when I click a choice or press Enter is when validate routine is invoked.
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May 9, 2011
ComboBox drop up instead of drop down..i want to defualt for a particular drop down box to work this way how can i do it.
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Feb 8, 2011
i have a login form that contains a combo box and a text box and a button. the items of the como box are from the databse while the person selected can only log into the system if the password he enters on the textbox matches the password details in the database.(of the name selected)
my problem is, the second tab contains a couple of textboxes and combo boxes that need to be filled in. but i want the first combo box in the second tab to have drop down value of the name of the person that has logged in to fill in the form.
the person login in the first tab, his name should appera on the combo box in the second tab
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Nov 29, 2005
I have a problem with Combo Boxes. When one uses the mouse to open the drop down menu, the text appears to be missing, but when you click on a entry, the text appears in the box at the top of the combo box (the thumb?). Likewise, when the cursor keys are used to scroll through the options, the text appears in the thumb.
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Jul 20, 2011
Recently started working with VB.NET, and I'm just playing around with the controls and everything. What I want to do, is populate a drop-down list or a combobox (on program load) with data from a dictionary. I'm used to php, so I tried a for each dictionary.items as newitem combobox.items.add(newitem) but I can't get it working. Can someone give me an example of this? And what if i wanted only the key to show in the drop-down, and the corresponding value shown on a label besides it when I make a selection?
[Code]...
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Jun 12, 2011
How to turn the combo box/drop down box uneditable.
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Jan 29, 2010
I have in my code the CBN_DROPDOWN command that is sent using a Windows Message, but I want to be able to make the Combo Box List Drop Up as well. Does anyone know if this is possible or how I can do it?
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May 22, 2009
I have a modal form with a single instance of the built-in .NET 2.0 tab control. The tab control has several pages, and on one of them is a combo box that isn't populated until the user activates it for the first time. When that happens, I handle the DropDown event and run a process that takes several seconds, then I add the items returned by that process to the combo box.It works fine, except right after the list portion of the combo box is dropped down, it immediately closes as if some other control took the focus. I've narrowed it down to the fact that there is a tab control on the form, and the process that retrieves items for the combo box takes more than 4 seconds. If I create a completely blank form with just the combo box, I don't see this behavior.
Needless to say, this is strange beyond belief. Any idea why the tab control would interfere with the control that currently has focus?
[Code]...
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Jul 24, 2011
I've created a form to handle "frequently asked questions". In the form I have five Drop-Down Combo Boxes and I want the user to be able to select one of the questions listed in the drop down boxes and have it return a "message box" with the answer to the question. Naturally I'll have different "answers" for each question, but my initial efforts have me getting my message box as soon as I click on the drop-down arrow itself, and I don't want that triggered until I click on the specific question.
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Oct 5, 2011
I want a to create a combo box that gets the selectable items from a table and when I save the form I want the selected item saved to a different table. I'm sure this is simple I'm not a database wiz and still very much a newbie.
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Jun 15, 2012
I have decided to add some validation to my combobox, what I'm trying to achieve is to make sure that the user can ONLY enter fields that are in the combobox but the problem I have now is that if the user clicks on the combobox and doesnt enter anything and tries to leave the combobox the message box appears.
Private Sub Combobox1_Validating(sender As Object, e As System.ComponentModel.CancelEventArgs) Handles Combobox1.Validating
If Combobox1.Items.Contains(Combobox1.Text) = False Then
e.Cancel = True
[Code] .....
As stated before the coding does work, but I was trying to make sure the message box does not appear if the user doesnt enter anything in the combobox.
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Feb 23, 2011
I have read through some of the other posts and I think what I want to do is slightly different. I have a combo box in VB ExpEd2010 that I want to allow the user to only select from the drop down list. However, I want to be able to set the value in the combo box to something that is not in the list. So the drop down list will have values 1, 2, 3 but I want to be able to write to the same combo box a value of 2.4, 1.2, etc.
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Dec 7, 2011
Is it possible to force a combobox to run it's validation event without moving the focus out of the ComboBox?
I need the event (or an event) to trigger when an item is selected with the mouse or an entry is typed into the combo box. I tried using SelectedValueChanged and SelectedIndexChanged however, these events do not fire if the user types a value that does not exist in the list source. I know I can change the DropDownStyle to DropDownList however, I still want the users to be able to type entries in the combobox (with auto complete).
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Jul 16, 2009
See the below
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
[Code]....
the last value inserted into the access database will be add to the drop down list of their corressponding combo box.
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Jun 5, 2011
If there was any easy were to make sure that an entry havent been used twice in a selection of ComboBoxes. Heres the start for what id have to do if there isnt.
Private Sub ComboBox9_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox9.SelectedIndexChanged
If ComboBox9.Text = ComboBox1.Text Or ComboBox2.Text Or ComboBox3.Text Or ComboBox4.Text Or
[CODE]..............................
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Mar 27, 2011
Combobox, Textbox , NumericUpDown and MaskTextBox validation in VB?
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Sep 11, 2010
I have a small requirement and that is: There are two combo boxes on a form and for populating the employee names and roles. I am populating the combo boxes as follows: I have created a class called "DbConnect" and in that there are 02 functions as:
Public Function getEmployees() As DataTable
Dim employeeDS As New DataSet
Dim employeeDA As New SqlDataAdapter("prc_emp_list", conn)
employeeDA.Fill(employeeDS, "employees")
[code].....
The data is getting populated into the combo boxes correctly and my requirement is that when I select and employee from the first combo, his corresponding role should get selected in the second combo.
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Jun 23, 2010
when i call my Form2.Show() i need to make a combobox in Form2 show its "drop down". in other words i do not wish for the user to have to press the combobox before it shows its "drop down" and would like to do it automatically.is this possible?
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Aug 9, 2009
I want create a DateTimePicker Component and Using a combobox for type date in it, with vb.net ... I created a form Likes Calendar in V.S.Net and added to this project ...now, I want if you click on combobox not open drop down list, open form. but opening both.I don't know how to blokage it.
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Aug 12, 2010
how to drop this laybout combobox in vb.net ?
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Apr 15, 2011
In a Windows Form application (VB.NET) I have a combo box and under certain conditions, when the user opens the DropDown list, I want to display a warning message.All of this works well: In the DropDown event, I check the conditions and if required I display the warning message.The problem is that when the user clicks on Yes on the warning message, I move to another tab on the main form and the drop down list still shows even though I've moved away from the tab containing the combo box.I've searched quite a bit and tried to set DroppedDown to False, call OnDropDownClosed, etc but nothing worked.It seems that when I try to close the drop down list from within the DropDown event, it doesn't work.
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Oct 6, 2008
1. Although I have enabled AllowDrop property of ComboBox it does not allow me to drag and drop files into ComboBox. Why?
2. Then should I process incoming files in the _DragDrop event, yes?
3. How can I get the Files.Count to get the number of dropped files?
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Mar 12, 2012
Is using Public Property the best way to achieve the following.From a drop down combobox, a list of options are available. Each option in the combobox has a number of public properties that need to be associated with it.When a option is selected, the user will then have two buttons that each call a different sub, the appropriate options are passed to the sub.Each option will always have the same properties required to be passed.So I'm looking at something like this.
Public Class Parameters
Public Property server As String
Public Property replica As String
Public Propery path As String
End Class
[Code]...
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Mar 23, 2010
I have created a drop-down list box that holds 8 numbers representing a month span (3, 6, 9, 12, 15, 18, 21, 25 months). In order to prevent users from typing just anything into the text box above the combo box, I changed it to a drop-down listbox. The other requirement that I was hoping to implement was for the user to be able to type a number, after which the selection would jump to the appropriate item (i.e. the user types in '1', and the selection jumps to 12). This partially works. It will jump to 12, for example, but immediately after the user types the '1', the Selected Index event changes. The user cannot scroll down or up after typing in a number.
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Jun 7, 2010
How can i set the tool combobox when i write any thing the drop down list goes down and data begins to appear?as Google when you want to search for something it begins to suggest words for you. is it a special tool?
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Nov 18, 2009
I have a drop-down combobox. Is there any action that drop it down on runtime? I'd like to drop it down for the user, instead of asking him to press the "down" arrow.
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Nov 12, 2010
I have created a combo box in my project which takes a certain amount of numbers from a file. This Combo drops down the list of the numbers each of represents something. That something I want to be displayed in a tooltip when the mouse hovers on the combo box. Until now everything has gone fine. What I want now is to see the tooltip when the mouse rolls over the list of the dop down combo. How can I do that? Until now the internet didn't give me something to work on it. Is there some one to assist me on that?
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Apr 3, 2012
The issue I'm having is I have 3 items in my combobox however when I maximize my window the items do not enlarge and are the same size(or relative) to what they were prior to maximizing, hence overlapping. Is there a way? I've ony known how to increase width.
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