keydown

Javascript: Keydown Event: “Up” arrow key preventing further arrow-key Keydown events? (answered: keyboard ghosting)

由 时光怂恿深爱的人放手 提交于 2019-12-01 15:50:33
I've found a lot of related questions (here and elsewhere), but haven't found this one specifically. I'm trying to listen for keydown events for the arrow keys (37-40), however when using the arrow keys in a certain order, subsequent arrow do not generate "keydown" events. Example: http://blog.pothoven.net/2008/05/keydown-vs-keypress-in-javascript.html At that page, click in the "type here ->" box. Press and hold right arrow key: table updates to keycode 39 While continuing to hold right arrow key, press and hold up arrow key: table updates to 38 While continuing to hold right and up arrow

KeyDown event not Working on PrintScreen Key

由 ↘锁芯ラ 提交于 2019-12-01 15:49:37
I am using C# windows Application I am checking which key, user have pressed down by keyboard. I have checked for all keys but its not working in case of printScreen private void comboBox1_KeyDown(object sender, KeyEventArgs e) { MessageBox.Show(e.KeyCode.ToString()); } So how to detect PrintScreen Key You can use KeyUp, It captures PrintScreen key. The print-screen key is trapped by the OS before it is sent to applications. To detect such keys, you need to use a keyboard hook . You may be interested in this article: Low-level Windows API hooks from C# to stop unwanted keystrokes You can use e

Detect Enter Key C#

由 ╄→гoц情女王★ 提交于 2019-12-01 15:38:41
问题 I have the following code which does not show the MessageBox when enter/return is pressed. For any other key(i.e. letters/numbers) the MessageBox shows False. private void cbServer_TextChanged(object sender, EventArgs e) { if (enterPressed) { MessageBox.Show("Enter pressed"); } else MessageBox.Show("False"); } private void cbServer_Keydown(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.Enter || e.KeyCode == Keys.Return) { enterPressed = true; MessageBox.Show("Enter presssed: " +

KeyDown event not Working on PrintScreen Key

由 人走茶凉 提交于 2019-12-01 15:18:09
问题 I am using C# windows Application I am checking which key, user have pressed down by keyboard. I have checked for all keys but its not working in case of printScreen private void comboBox1_KeyDown(object sender, KeyEventArgs e) { MessageBox.Show(e.KeyCode.ToString()); } So how to detect PrintScreen Key 回答1: You can use KeyUp, It captures PrintScreen key. 回答2: The print-screen key is trapped by the OS before it is sent to applications. To detect such keys, you need to use a keyboard hook. You

Detect which key is pressed [closed]

由 拥有回忆 提交于 2019-12-01 14:50:57
How do I tell which key was pressed in a Cocoa Application (I know each key has an associated number)? In my case, I want to log the key to the console. This is my code: - (BOOL)acceptsFirstResponder { return YES; } -(void)keyUp:(NSEvent*)event { NSLog(@"Key %@", event); } Use the NSEvent methods keyCode , characters or charactersIgnoringModifiers . - (void)keyUp:(NSEvent *)event { NSLog(@"Characters: %@", [event characters]); NSLog(@"KeyCode: %hu", [event keyCode]); } NSEvent has the keyCode method that returns exactly what you're looking for. 来源： https://stackoverflow.com/questions/12770980

WPF Key is digit or number

由 给你一囗甜甜゛ 提交于 2019-12-01 14:03:22
问题 I have previewKeyDown method in my window, and I'd like to know that pressed key is only A-Z letter or 1-0 number (without anyF1..12, enter, ctrl, alt etc - just letter or number). I've tried Char.IsLetter , but i need to give the char, so e.key.ToString()[0] doesn't work, because it is almost everytime a letter. 回答1: Something like this will do: if ((e.Key >= Key.A && e.Key <= Key.Z) || (e.Key >= Key.D0 && e.Key <= Key.D9) || (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)) Of course you will

Keypress event in C++

由 我的未来我决定 提交于 2019-12-01 13:35:31
I'm currently using GetAsyncKeyState() to detect Keydown events, but then the events will be repeated while you are holding down the key. What would be an easy way to stop the event from repeating? Example If I hold down the key i on my keyboard for a while, I will get an output like this: iiiiiiiiiiiiiiiiiiiiiiiii Instead of this: i I want to force the user to press the key again to trigger the event. Avoid using a keyboard related message like WM_KEYDOWN or WM_CHAR to detect a key, Windows repeats WM_KEYDOWN when the user holds it down. You simply need a your own bool flag that keeps track

Detect which key is pressed [closed]

由 走远了吗. 提交于 2019-12-01 13:31:03
问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . How do I tell which key was pressed in a Cocoa Application (I know each key has an associated number)? In my case, I want to log the key to the console.

Detecting keydown and keyup events on Linux C++ [duplicate]

由 爱⌒轻易说出口 提交于 2019-12-01 11:36:01
Possible Duplicate: Access Keystrokes in C Monitoring Keyboard keys in Ubuntu I want to detect and time stamp every keydown and keyup event in a program (Yes, I mean keydown and keyup not just keypress) along with what key was pressed. I could do this by using an APi such as GTK, but I want to get as simple and low level as possible in order to avoid overhead from the libraries affecting the times as well as writing less code. I have been googling this for a while and so far have found a ton of stuff about how to do it on Windows, which doesn't help me since I am using a Linux system, and how

Capturing of keydown events in a html page with frames

由 那年仲夏 提交于 2019-12-01 11:17:18
I have a jsp page with frames <%@ include file="/includes/taglibs.jsp"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd"> <html> <head> <title>Welcome</title> <script type="text/javascript" src="/js/jquery-1.3.2.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $(this).keydown(function(e) { if(e.keyCode==27){ alert("escape pressed"); e.preventDefault(); } }); } ); </script> </head> <frameset rows="42,*" frameborder="0" framespacing="0" id="framest"> <frame src="/xyz/abc.html" scrolling="no" name="frame1"/>
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