I'm hopefully missing something extremely obvious here, but for the life of me I can't figure this out.
I have an AutoCompleteBox control that is retrieving results by way of an asynchronous call, although I can't find a reliable way in which to know when a user has selected an option from the list of returned values. I've tried hooking into the SelectionChanged event, but that fires on every movement within the autocomplete's drop down list, when what I actually want to know is when a user has definitively said "Hey, that's the item I want!" by either clicking it, or selecting it with the return key.
Any advice would be greatly appreciated as this is starting to drive me a tad crazy now. =)
Thanks
P.S. The SelectionChanged event arguments provide AddedItems and RemovedItems, but don't give any direct indication of the type of selection I'm looking for.
There isn't a specific event that indicates that the used has specifically plumped for an option rather then merely browsing.
For you scenario the closest you can get is DropDownClosed or even LostFocus events then access the SelectedItem property.
If you are using the Telerik AutoCompleteBox, perhaps the "OnEntryAdded" event is what you are looking for. I see this question was asked over 4 years ago so perhaps this event didn't exist back then. I just updated to the latest update of Telerik controls (2014 Q2). Here's a quick example. I removed the properties that we're not discussing here to clean it up but, obviously, those will need to be added back in unless you're setting them in code (e.g. DataSourceID).
Source Page:
<telerik:RadAutoCompleteBox ID="RadAutoCompleteBox1" runat="server" OnEntryAdded="RadAutoCompleteBox1_EntryAdded" >
</telerik:RadAutoCompleteBox>
Test Code (in VB):
Protected Sub RadAutoCompleteBox1_EntryAdded(sender As Object, e As AutoCompleteEntryEventArgs)
MsgBox(e.Entry.Text) 'This is just to show you the DataValueField in your dev
MsgBox(e.Entry.Value) 'This is just to show you the DataTextField in your dev
racbCustomer.Entries.Clear() 'This will wipe out the selection(s)
End Sub
Related
I'm using the ObjectListView control from here.
I'd like to detect when a user right clicks the headers and hides or shows a column. Basically a ColumnVisibilityChanged event. The reason I want to detect this is to save the visible columns between sessions.
The ColumnWidthChanged event fires when this occurs (not on the column that has been removed), so I could iterate through AllColumns and check the value of IsVisible. However, that seems hacky and I'd like to avoid it. Also, that would get run several times when it didn't need to.
Anyone know of a better way of detecting a column being hidden or shown?
Well I found a solution that wasn't quite what I was looking for, but possibly better.
ObjectListView has SaveState() and RestoreState() methods as described here.
I'm displaying incomplete datasets in a listview.
When an item gets selected (doubleclicked or highlighted + enterKey),
I want to open a form, that allows me to add the missing data.
I checked the doc-page of ListViewItem and found that I should probably either use .OnSelected()-Method or .Selected-Event. However my IDE(#develop) offers neither of those, just a property called Selected Adding hte System.Windows.Controls-Namespace didn't change anything, though some googling suggested otherwise.
My question is:
How can I get access to these Methods/Events or is there a workaround, i.e. a ListView-Event that offers similar functionality?
Nevermind,
I used the ListView.ItemActivate-Event.
I'm having the hardest time using the dropdown list side of Krypton Dropbuttons -- specifically, I don't know how to register that I've actually selected something within the dropdown list.
In my project, I am using a dropbutton to apply a change over time, where simply clicking is immediate and the drop list has various increments of time -- I am using tweener-dotnet for the value change over time, as my calculus is awful and why reinvent the wheel?.
I am able to use the dropbutton as a regular button just fine. In addition to that, I've been able to set my ContextMenu in the dropbutton, so when I build the solution and click on the dropdown arrow, the list shows up. What I can't do, however, is figure out how to tell the code that I've actually selected something within the dropdown list.
I've spent a couple hours, collectively, staring at all three iterations of the DropButton examples, and none of them actually show what I'm looking for (seriously, Component Factory?!).
How do I use the dropdown side of the Krypton Dropbutton?
(For open source sake, I may just go back to a regular dropdown list and a regular button, but I really like the simplicity of the Krypton DropButton, and open source isn't really a priority with this project.)
I know that this is late, but I've been dealing with something similar.
For a KryptonDropButton you need to create a KryptonContextMenu, as #Roberto has stated.
Then I went to add a listener to the manu items that I've added to the assigned KryptonContextMenu and found out that the designer does not support the Name property (or maybe I was too blind to find it).
Anyway, I navigated to the designer file I found that those menu items were generated anyway, with default names.
Something like this:
I then went to rename those and added events like I would normally to respond to user selection, but I won't hide that this is overkill.
I'm about a year and a half late, but here's a radiobutton click event.
Just select the control and event at the top of the IDE.
Public Sub KryptonContextMenuRadioButton1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles KryptonContextMenuRadioButton1.Click
'do something
End Sub
Update 2018: the toolkit has been opensourced here: https://github.com/ComponentFactory/Krypton
Component factory hasn't been actively worked on since 2011. Its still closed source so that is an issue.
The Krypton Toolkit itself is a bit iffy in .net 4 and above. The KryptonContextMenu that you need with the KryptonDropButton is one of the bits that I've been having difficulty getting to work.
I began to make a program in c# using wpf and the mvvm pattern to learn this program language. I feel sorry that I finally have problems I can't solve using Google. But I try being precise.
At first I present you the GUI, so I can explain my problems more easily.
The xaml file of the MainWindow comes here.
As you see, it's not a serious and important program, I just made it to learn some techniques.
Now comes my main question:
I need the SelectedItem Property of the second ListView(Consumables) in the footer. I thought this wouldn't be a serious problem cause I can just bind it to the selected item using relative path and the name of the listview. This didn't work and caused a null reference error as soon as I added an item to this listview. I double checked the code and I am sure I haven't made something wrong there. So I thought the problem is, that it's kind of a descendant ui element.
My next try was to create a new property in my main view model which is bound to the selected item. You can find this in line 136. But as I found out, this causes me a System.NullReferenceException too if i click on an item. I think it's because this property is read only. I don't know what to do. Isn't there any other possibility to bind the SelectedItem as DataContext for the footer?
My Second Question is about line 27. The TabControl should always select the first Tab automatically. But it makes it only every second time. It's quite funny. If I scroll down the Champion Combo Box, the first tab goes: selected - unselected - selected - ...
My third and last Question is about 72 which is similar to line 50 (The DataContext is the same too) But the ICommand of the ContextMenu of the itemtemplate you see line 50 works, whereas the contextmenu (l. 72) does not call the Icommand. Weird.
It's a fun project, so I can provide you the source code if my information are not enough.
--Sorry, only two hyperlinks allowed--
Please help me. I am just a bit confused by this unsuspected behaviour. I haven't found anything that could help me and I'm sorry if the answers of these questions will be simple :P
Just to emphasize it: The main question is the only one I really need an answer for. The second one could be solved programatically. And to solve the third one, I could just remove this feature.
I'm happy for EVERY HINT!
Haven't gone through the entire question but you should bind selected item to your view model property (two way binding) and then bind another UIElement to this view model property (probably one way binding or check for value equality as to not cause stackoverflow exception)
Im trying to emulate a 'find as you type' function like that of the address bar ("awesome bar") in FireFox. I want a suggestion box to appear below a textbox, and the suggestion box contains strings that contain what is in the textbox. I looked at the autocomplete feature of a normal WinForms textbox, but it seems to only search the beginning of the strings.
Has anyone here built or have experience with implementing something like this?
edit:
Some clarification- It is a WinForms project.
It needs to search inside a string, not just the beginning (which is what a normal textbox does if i recall correctly). And the suggestions should be displayed in a popup like a textbox autocomplete.
You need to handle the TextChanged event for your text entry field, and when the text changes, start a new thread running that will apply the new search. If the text changes before you get your results back, just kill the thread. If the thread returns results in time, display them.
You can get slightly more advanced (e.g. wait for a short time after the text changes so that the user can type a word without you triggering off loads of useless threads) but essentially that's it.
There was a discussion earlier on this topic where the author concluded that you are better off doing the whole thing yourself.
How can I dynamically change auto complete entries in a C# combobox or textbox?
I did something vaguely similar, but more like the iTunes® search box than the Awesomebar. My control used the textbox to actively filter a grid; so it wasn't for autocompletion.
...but... basically I had a DataView of all eligible items, whenever the TextBox's Text changed I'd update the Filter to hide all non-matching items. It worked well and might suit your needs for filtering the data--but not sure how to go about using it as an AutoComplete source for the textbox.
I have done such a thing for an app of mine not too much time ago.
What I did is make my search function in a new thread, so every time I typed a new letter, it called the search function in another thread, so I could keep on typing.
I can post some code if you need, but this should be enough to get you started. :)
Hemmed and hawed about deleting this after I noticed the OP edit mentioned winforms, but I think it'll be useful to anyone who comes here looking for the same but for asp.net apps.
Just because nobody has mentioned it yet, for a webforms app you absolutely want to do this with ajax (.net controls or pure JS, your choice). The feature is often called "autocomplete" and the one thing you don't want it to be breaking the seamlessness by making server round trips at the page level.
I suggest you look at this and this.
I've used Search As You Type in C# and How do I make a Textbox Postback on KeyUp?
Basically you use the keyup action to call a postback thats attached to the trigger to the update panel. then you do your update in the textbox_changed event with the dataview or whatever your backend looks like.