combobox

问题 I have a WPF Combobox that is bound to a list of viewModel objects. Initially the SelectedItem is null, and thus the Combobox display is blank. When the selected item is null, I would prefer the Combobox to display "Select an item" to guide the user to select something from the combobox. sort of like the way, some text boxes contain gray text such as "enter user name" Any ideas on how to do this? Edit: I ended up using the suggestion to overlay a textbox, and change its visibility based on

问题 I've already found a lot of questions about manipulating the highlight of items to select in the dropdown of the combobox or overriding system brushes. This is NOT what I'm after.. I want to get rid of the text highlighting of the selected item shown in the combobox textfield after selecting. But I do not want to get rid of the text highlighting in the dropdown! So overriding the system brushes is not what I need because that also affects the items in the dropdown. Below is XAML for a

问题 I have a combo box that I am binding from a sql server database. I am binding one column from the database into the combo box. The problem is that I get the same item showing up in there several times. I am querying from a stored procedure. Let me know if there is anything obvious that I am missing. Thanks public void BindComboBox() { _dsinventory = new DataSet(); _dsinventory = dbAccess.ExecuteQuery(InventoryOutputQuery.ComboBox_Type()); cmbType.ItemSource = _dsinventory.Tables[0]

问题 I have a combo box that I am binding from a sql server database. I am binding one column from the database into the combo box. The problem is that I get the same item showing up in there several times. I am querying from a stored procedure. Let me know if there is anything obvious that I am missing. Thanks public void BindComboBox() { _dsinventory = new DataSet(); _dsinventory = dbAccess.ExecuteQuery(InventoryOutputQuery.ComboBox_Type()); cmbType.ItemSource = _dsinventory.Tables[0]

问题 Suppose the combobox is linked to enum "ABC". The elements in it are A, B C and D. Now I need to get only A and C in the combobox and not B and D? Is this possible? 回答1: It is not possible to delete enum values or combobox values. You can duplicate the enum, then delete elements or change the order (but not the enum value). It will be your responsability to maintain both enum types synchronized with future changes. To assign an enum to another incompatible enum, just add zero to it! abc =

问题 I'm trying to change the background of certain items in a combobox that meet a condition <ComboBox ItemsSource="{Binding Path=Model.Names, Mode=OneWay}" SelectedValue="{Binding Path=SelectedCompanyName}" DisplayMemberPath="Alias" /> The thing is that "Alias" is saved in two different places (in company and in order) and if they dont match we want to highlight this. I want to do something like this: <Style>... <DataTrigger Binding="{Binding Path=isMismatch}" Value="True> <Setter Property=

问题 i have ComboBox cbx and a TabPane Contains Tabs (tab: t ) and a button b1 . So on click on this button b1 , it adds a new tab t in the TabPane and it adds a new item in the ComboBox cbx contains the same name of the tab. The problem is i don't know how to get the item from cbx and much the name of the item with the same name of the tab and then Do something so how i can do this with javafx and thanks very much :) 回答1: Take a look at the API: http://docs.oracle.com/javase/8/javafx/api/javafx

问题 i have ComboBox cbx and a TabPane Contains Tabs (tab: t ) and a button b1 . So on click on this button b1 , it adds a new tab t in the TabPane and it adds a new item in the ComboBox cbx contains the same name of the tab. The problem is i don't know how to get the item from cbx and much the name of the item with the same name of the tab and then Do something so how i can do this with javafx and thanks very much :) 回答1: Take a look at the API: http://docs.oracle.com/javase/8/javafx/api/javafx

问题 I have this code in start method: ObservableList<StringBuilder> list = FXCollections.observableArrayList(); list.add(new StringBuilder("0")); list.add(new StringBuilder("1")); list.add(new StringBuilder("2")); list.add(new StringBuilder("3")); list.add(new StringBuilder("4")); list.add(new StringBuilder("5")); list.add(new StringBuilder("6")); list.add(new StringBuilder("7")); list.add(new StringBuilder("8")); list.add(new StringBuilder("9")); ComboBox<StringBuilder> combo = new ComboBox<>

问题 I have this code: private void FillCombobox() { using (InventoryEntities c = new InventoryEntities(Properties.Settings.Default.Connection)) { List<Customer> usepurposes = c.Customers.ToList(); DataTable dt = new DataTable(); dt.Columns.Add("id"); dt.Columns.Add("name"); foreach (Customer usepurpose in usepurposes) { dt.Rows.Add(usepurpose.id, usepurpose.name); } comboBox1.ValueMember = dt.Columns[0].ColumnName; comboBox1.DisplayMember = dt.Columns[1].ColumnName; comboBox1.DataSource = dt; } }