I am using a textbox in winform (c#) and using the text to make consults in a database.
But I need constantly consult the text of the textbox every time that text changes. So for these, I use the KeyUp. But this event is too slow.
Is any event that just fires when the textbox editing has been finished ?. I consider for finish 2 conditions
The control lost focus.
The control has 200ms without keypress
You could use the LostFocus event, to capture when the user clicks on a control outside the textbox.
Otherwise, you'll need to choose from one of the existing events. (Listed here)
Come to think of it, you will likely have to capture multiple events. DragDrop if someone copies/pastes, for example...
You mean something like this?
Control.LostFocus
Provided that you consider finished as being when they click off the textbox.
Related
I want to use an event or something what is fired when I am typing in the cell. I tried SheetChange and SelectionChange events, which were not I need. Both of them are fired after things changed. Is there any way I can fire a event when I'm editing in a cell? Like some controls that have XXXEditing/XXXChanging events?
At least, you can detect when the cell is in "Edit mode", i.e. is accepting input, see:
https://www.codeproject.com/Articles/20267/Determining-if-Excel-is-in-Edit-mode
But you won't be able to detect when the user is typing anything, unless you are willing to use dirty Win32 API tricks.
There is no event against changing cell that starts before changing it.
change event fires after you have changed the content of the cel
selectionchange event fires when you change the selection
I have a feature request that when a ComboBox is 'clicked into' that it clears the text so that the user can start entering in new data to search. Does anyone know of a way to hook into this? The 'click' event is raised on when the text is clicked as well as when the drop down arrow is also clicked (which opens up the drop down with items). I only want it to happen on the first, not the latter.
Right now I'm capturing the click event and filtering on the DroppedDown property like so:
if(!comboBox.DroppedDown)
{
// clear selection
}
This seems to work most of the time, but bugs out frequently as well... so its not 100%.
If anyone knows of a proper way to do this I would appreciate!
Don't handle the click event. For one thing, it won't fire if the user tabs the focus into the control. Use the Enter event which fires when the control receives focus. And rather than clearing text you should just select it all which will give the best of both worlds:
1) The user can start entering new text which will clear any old text or
2) tab past the control and leave the contained text as it was.
If you always remove the previous text you may anger users.
Try the "Enter" event. It happens when a control gains focus on the form.
I'm wondering how to filter the input of a .NET textbox.
I already know that I could listen for the KeyDown event and intercept the key, but that won't filter pasted strings by a right-click menu or a CTRL+V.
I also don't wan't to completely disable the possibility of pasting of characters in the textbox. The paste action should be cancelled whenever it contains one or more invalid characters.
Finally, I'd like to display a notification balloon whenever invalid characters are either entered or pasted.
μTorrent already has this exact behavior:
How can I achieve this functionality in C# ?
TextChanged event - Seems like a good call.
You can spawn your own baloon or ToolTip on any control you want to show a detailed feedback to the user
It seems like a combination of KeyPress, TextChanged, Validating, and Validated events should work for your purposes.
I'm currently updating it on click, but this results in the user being able to see the repopulation occur. Which other event can I use which will allow me to handle it myself, then show the combobox when i'm ready? ( after population)
I don't know what you're developing, but that combobox is probably on a window or so that will have an event that fires on show. Use that event to populate the combobox in.
[edit] Ah Winforms. Use the Load event.
[edit2] On each click eh.
Alright. I found a dirty solutions that advises you to override the WndProc and capture messages, but I think it's better to inherit the combobox and override OnDropDown to perform you populating before calling the ancestor's OnDropDown method.
You should populate the box when entered too, because a value may be selected using the keyboard (arrows) without even dropping down the box. You'll need both if you want it on each selection, because a click only causes the Enter event when the box didn't have focus before.
Have you tried the ComboBox.DropDown Event?
You could try to call SuspendLayout() before updating and calling ResumeLayout() after the changes.
combobox.add_HandleCreated triggers after the control is created as the form is loading
i'm doing a webshop in asp.net (c#).
Is there a way to push the edit button in the gridview through the code of c#?
I have a "new" button, that just adds the row, it would be great if that same row would "open" itself for editing without user having to press "new" then "edit"...
I know there are other ways to do this, i just want to know if this is possible... it would save tons of time!!
thanks in advance for the anwsers!!
Andrej
Just call the event handler you wrote to handle the edit button push.
Basically speaking, all that happens in code when you click a button is that the button's Clicked event is raised. In a GridView, the event is actually something like GridViewButtonClick. However many handlers you have plugged in will then execute (and you can't, and shouldn't have to, control the order of execution). For a built-in button, because you cannot raise the event from outside that button, you can simulate the button click by just calling the handlers you have attached to the event. If this were your own custom control, you could define a method you could call from outside that would cause the control to raise a certain event.