keydown

Winform Datagridview handle tab and arrow keys

由 僤鯓⒐⒋嵵緔 提交于 2019-12-13 13:25:05
问题 I want to handle the KeyDown event on the DataGridView cell. I use the following code to get the KeyDown event on cell: private void dgvData_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { var tb = (DataGridViewTextBoxEditingControl)e.Control; tb.KeyDown += cell_KeyDown; } But looks like I cannot handle some special keys like tab and arrows. Those keys does not go to my cell_KeyDown method. So I try to handle them in the DataGridView's KeyDown event:

Keydown processes previous character instead of current one

由 ぃ、小莉子 提交于 2019-12-13 12:50:40
问题 I try to create an MS-Dos emulation window with jquery and ajax. It works well but when I type a word or press enter, the script is one character too late on display (no character displayed on first press then, for each next keydown, it shows the previous character typed by the user instead of the current one). Here is a simplified version of my script: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <link rel="stylesheet"

More efficient way of screening KeyCodes on KeyDown Event

由 谁都会走 提交于 2019-12-13 05:15:33
问题 I'm trying to fire an event perform some work when the user tries to enter only useful data into a form-field using the KeyDown event. But, I keep getting false alarms because the KeyDown event works for just any key! I'm trying not to make the event fire for buttons such as "Alt, Control, Shift, Esc, the F-keys, etc." What's the best way of doing this? What I have so far is this: private void formControl_KeyModified(object sender, KeyEventArgs e) { if (e.KeyCode != Keys.Shift && e.KeyCode !=

Keydown event - cool down

由 房东的猫 提交于 2019-12-13 02:15:56
问题 I have a project with keydown event, but as every keypress, i click on the key and if i kip clicking it, it will wait a half second and start spam quickly the key. I need it to spam with no cool down, what can i do? 回答1: Instead of changing the system-wide settings and still have a delay of 250ms, you can watch keydown and keyup events for the same key (don't forget that a user can press multiple keys at once and release them in different order). Start a timer with required frequency on

String.fromCharCode not working on keydown event

由 你离开我真会死。 提交于 2019-12-12 18:25:13
问题 I am tyring to read the input characters on keydown event and try to process them. When I am triing to convert them into character using "String.fromCharCode(key);" Its always giving me the capital letters. Upadte: Strangely the code works if I listen for "keypress" event. What is the reason for this. Could some one please explain this behavoir. The sample code is given below: var inp = document.getElementById("ti"); inp.addEventListener("keydown", onKeyDown); function onKeyDown(e) { if

In Javascript, How to detect the character case (upper/lower) in keydown & keyup events?

由 隐身守侯 提交于 2019-12-12 16:16:08
问题 I need to detect the case of characters in event keydown and keyup $('body').keydown( function(event) { var charCode = (event.which) ? event.which : event.keyCode; var char = String.fromCharCode(charCode); console.log(char + " is down pressed"); } ); $('body').keyup( function(event) { var charCode = (event.which) ? event.which : event.keyCode; var char = String.fromCharCode(charCode); console.log(char + " is up pressed"); } ); You may try it here: http://jsfiddle.net/8dqwW/ It's always

keydown not detected until window is clicked

由 一个人想着一个人 提交于 2019-12-12 13:44:43
问题 In my web application I have an event listener for a key that opens a menu. This works just fine only AFTER I have clicked anywhere on the page. I have tried to add focus to the window onload...but this still does not let the keydown function run until after I have clicked somewhere on the page. Does anyone know if this is possible? I can't imagine that it is not, but .focus(); is not the goto as far as I have tried Example of my primary function: document.addEventListener('DOMContentLoaded',

How can I get keydown events on a div in chrome?

由 南楼画角 提交于 2019-12-12 07:36:18
问题 I'd like to get keydown events on a div. I use JQuery keydown. Pretty simple. However, it does not work on chrome. For this to work on chrome, I have to set tabindex = 0. If I do this, Chrome puts an ugly orange border around my div. Is there a way to make this work on chrome without the ugly orange border? 回答1: Keydown event is only sent to the HTML element that has the focus. Focusable elements vary between browsers, but elements of which tabindex property is set can always get focus in

Silverlight keydown event for games

由 可紊 提交于 2019-12-12 06:16:28
问题 I'm trying to use the key down event in silverlight for a game I'm working on. The problem I'm having is that silverlight treats keydown like windows does. For example if you hold down the left arrow key the keydown event triggers once, then pauses for a short while before triggering repeatedly. Obviously in a game this won't do since a player expects to be able to hold a key down to repeat an action without a pause in event. So how do I get key down events constantly without the brief pause

jQuery kepress detection on left, right arrows and space bar

由 半腔热情 提交于 2019-12-12 02:25:32
问题 I'm trying to use a little jQuery here to detect which keys are being pressed. I've a lot about trying to use functions to detect ASCII codes and such to see which keys are being pressed, but I'm a little confused. Also, what's the difference between keyUp, keyDown and keypress? 回答1: keydown: Fires when the user depresses a key. It repeats while the user keeps the key depressed. keypress: Fires when an actual character is being inserted in, for instance, a text input. It repeats while the
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