The combobox is editable so user can also write. I have two usecases:
Get the text from combobox in a Lostfocus way, when user writes
something in the box and when he presses "Tab" then I want the text
from the combobox and I add the value in the itemsSource list.
When the users makes the selection from the combobox dropdown, I want that
selected item as soon he selects it and this time I dont
want to have it in Lostfocus manner but somewhat like
PropertyChanged way.
I tried the code which is given below:
<ComboBox Margin="3" x:Name="Combobox" SelectedItem="{Binding SelectedPath, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Text="{Binding PathLocation, UpdateSourceTrigger=LostFocus, ValidatesOnNotifyDataErrors=True}" IsTextSearchEnabled="True" VerticalContentAlignment="Center" ItemsSource="{Binding SelectedPaths}" IsEditable="True" Grid.Row="0" Grid.Column="1" Grid.ColumnSpan="2" HorizontalAlignment="Stretch"/>
Things worked fine for the first time when the application starts but after some interactions the problem arises. When the user starts typing in the combobox the SelectedItem property of combobox triggers which is contrary to what I want in the first use case.
In short: when the user writes something in the combobox I want to have it in a Lostfocus manner and when he makes the selection from the dropdown of combobox I want to have it in a PropertyChanged manner.
Let me know if more details are required.
I removed the "IsTextSearchEnabled" property but it also didnt work then I came to know that "IsTextSearchEnabled" property of Comobobox is by default true, which is causing some values suggested by the combobox are setting in my properties. As soon as I made the "IsTextSearchEnabled" to false, it is working fine.
Related
I have created search option using combobox, for example
In combobox1 items are m1,m2,m3,m4,m5 based on that, if m1 item selected then
another combobox2 displays with items a,b,c,d and if a item is selected another
combobox3 dispalys, based on last combobox it searches on the datagrid.
I think it is long process, use of many combobox makes it lenghty. Is any
other way is their to implement this. plz help
<ComboBox Grid.Column="1"
Grid.Row="1"
x:Name="cmbType"
VerticalAlignment="Top"
IsEnabled="{Binding IsOther}"
ItemsSource="{Binding Source={StaticResource enumTypeOfType}}"
SelectedItem="{Binding SearchType,Mode=TwoWay}"
SelectedIndex="{Binding CmdResIndex,Mode=TwoWay}"
IsSynchronizedWithCurrentItem="True"
SelectionChanged="DataSource1"
Margin="0,0,1,0">
</ComboBox>
So if i get this right, you have a collection a, which goes to collection b,etc, and the second collection will change based on the selected item of the first? You have to remember, that since the data will change for each selection, hard coding the value is out of the question.
Knowing this, WPF provides you with a great mechanism for this. Using a stackpanel, with a list view will actually work.
<ItemsControl ItemsSource="{binding collections}" ItemTemplate="{binding TemplateForListViewItems}" ItemPanelTemplate="{binding itemPanelTemplate}"></ItemsControl>
Now, with the items control, one can simply set an ItemTemplate/DataTemplate, to set the styling of each control. Linking to the onclick event, or using interactions, you can simply do collections.Add to add your new list view with generated data for the selection, and done.
I have a radcombobox which is TextSearchEnabled and Editable. The issue is whenever there is a textchanged it automatically selects the first item that is matched and that actually filters out the other dropdown which i wanted to restrict it.
Is there anyway i can restrict this behavior and only update the selected item on lost focus.
<telerik:RadComboBox x:Name="ComboBox"
ItemsSource="{Binding Users}"
SelectAllTextEvent="GotFocus"
IsTextSearchEnabled="True"
IsEditable="True"
telerik:TextSearch.TextPath="FullName"
IsFilteringEnabled="True"
SelectedItem="{Binding SelectedUser}"
TextSearchMode="Contains"
MinWidth="80"
DisplayMemberPath="FullName"/>
I got the answer from telerik forum where i posted the same question. So here i am answering it on my own.
ANSWER:
In order to disable the auto selection of items in the RadComboBox
control all you need to do is set its CanAutocompleteSelectItems
property to False.
Here's the link to forum:
http://www.telerik.com/community/forums/wpf/combobox/radcombobox-selects-first-item-on-textchanged.aspx
I have a custom WPF control - essentially a combo-box with check-boxes. The combo-boxes are successfully bound to a list of available items.
This control is to represent a field on a form. It is possible for the form to be completed already, in which case, the control must be rendered with the selected items - i.e. any items previously selected must be rendered as a checked CheckBox; it is here I'm running into trouble.
My first thought was to simply bind the IsChecked property - I don't think this can be done as the list of currently-selected-items is different from the list of available items which the ComboBox is bound to.
Basically, how do I gain access to the CheckBox object to set the Checked property to true? I've looked into this extensively and I can't fathom this out.
I'm using the ItemContainerGenerator approach - so when the user clicks on the drop-down, it is intended that a handler will iterate through the CheckBoxes and set the relevant boxes to checked.
Here's the XAML:
<ComboBox x:Name="FieldOptions"
ItemsSource="{Binding}"
HorizontalAlignment="Stretch"
Height="30"
KeyDown="FieldOptions_OnKeyDown">
<ComboBox.ItemTemplate>
<DataTemplate>
<CheckBox Name="checkbox"
Content="{Binding Path=Text}"
Uid="{Binding Path=ID}"
FontStyle="Normal"
Foreground="Black"
Checked="CheckBox_OnChecked" />
</DataTemplate>
</ComboBox.ItemTemplate>
Any thoughts would be much appreciated.
In the below window, the Existing Reports combo is bound to an observeablecollection of reportObjects. I have a reportObject property currentReport bound to the combo's SelectedValue property, OneWay. However, that's not working when bound in XAML.
SelectedValue="{Binding currentReport, Mode=OneWay}"
TwoWay binds fine, but I can't do it that way without writing an undo() method to the reportObject class. I'm binding the currentReport's properties to the various textboxes for editing. I want to bind OneWay so the source doesn't get changed. The currentReport's properties are all TwoWay bound to the corresponding textboxes so when I update the table in SQL [Save], it'll pull from that object, who's data is current.
<TextBox Text="{Binding currentReport.reportName, Mode=TwoWay}"
All of the properties bound from currentReport to the textboxes work fine as well. The only problem is the OneWay binding from the SelectedValue to the currentReport object. Does anyone have any ideas how to get this to work? I saw there was a bug, but the post I saw was 2009.
Sorry about the yellow. Not my idea. =)
EDIT: Added this XAML just in case.
<ComboBox ItemsSource="{Binding reportsCollection}" SelectionChanged="cboReports_SelectionChanged"
DisplayMemberPath="displayName"
SelectedValue="{Binding currentReport, Mode=TwoWay}"
x:Name="cboReports" Width="342" Height="40" VerticalAlignment="Center"/>
Forget about you need to change values - that is a separate problem - need to review your data design. Start with the UI problem question. If you want a user to be able to select an item from a combo box then it must have two way binding. Your first question is SelectedValue="{Binding currentReport, Mode=OneWay}" is failing why?
I have a ComboBox that uses an ItemTemplate as shown below. Somehow the Text property of the text box defined in the item template gets disconnected from the binding and stops being updated when the selected item changes.
The ComboBox.ItemsSource is bound to a DependencyProperty that is list of CatheterDefinition objects. The ComboBox.SelectedItem is bound to a DependencyProperty that is a single CatheterDefinition object.
<ComboBox
AutomationProperties.AutomationId="CatheterInfoModelFieldID"
VerticalAlignment="Center" HorizontalAlignment="Stretch"
ItemsSource="{x:Static PumpAndCatheter:CatheterInfoViewModel.CatheterModelDefinitions}"
SelectedItem="{Binding ElementName=UserControl, Path=ViewModel.SelectedCatheterModel, Mode=TwoWay, NotifyOnSourceUpdated=True}"
SourceUpdated="HandleModelSourceUpdated">
<ComboBox.ItemContainerStyle>
<!-- A style used to set the AutomationID based on the item goes here -->
</ComboBox.ItemContainerStyle>
<ComboBox.ItemTemplate>
<DataTemplate>
<!-- This line below is the location of the problem -->
<TextBlock Text="{Binding Converter={StaticResource CatheterModelDefinitionToStringConverter}}">
<!-- A style used to set the AutomationID based on the item goes here -->
</TextBlock>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
I have an automated test that produces a very strange behavior (I saw the same behavior a few time during the initial development of the code, but was unable to reproduce it manually) - The test that reproduces this selects an item form the ComboBox, then goes to another part of the application and takes some actions that end up saving this change in a data model. When the test returns to the screen with this ComboBox, it tries to select another item from the ComboBox. The SelectedItem changes, and the values that it is bound to change, BUT the text in the ComboBox does not change - somehow the binding to the Text property of the text box gets broken (or something)... The binding still executes (the converter still runs when the selection changes and it converts to the correct value), but the text property is never updated.
Thoughts? (I can't provide an example of this because it is a huge application and it is only reproducible under one test that I know of)
Broken bindings are most of the time caused by not calling (or not correctly calling) the OnPropertyChanged("PropName") method.
Without seeing your underlying implementation, I would say that this is most likely the source of the problem.