keydown

问题 I'm pretty new when it comes to getting my head around JS functions. Everything I've used before, I've tended to use as-is, but I've been trying to combine and modify a function to get a Div to toggle (height & opacity) on a specific keypress. I have the first part (can get the div to show on a 'ctrl + o' combo), but can't combine it with an if statement to show or hide, based on current display status. Current working 'show only' JS: $(document).keydown(function (e) { if (e.keyCode == 79 &&

问题 I have a form with CancelButton and AcceptButton (named btnCancel and btnOK). And I have some ComboBoxes as input fields. ComboBoxes prevent my AcceptButton and CancelButton to receive Escape and Enter keys, so I added this code to KeyDown event for all fields: if (e.KeyData == Keys.Escape) { ComboBox field = (ComboBox)sender; if ((field.DropDownStyle == ComboBoxStyle.Simple) || (!field.DroppedDown)) { e.SuppressKeyPress = true; btnCancel.PerformClick(); } } else if (e.KeyData == Keys.Enter)

问题 I am programming a game in microsoft visual studio c# and I have to catch lot's of keys simultaneously. I can't detect Q,W,E,R,T,Y at the same time but I can detect Q,W,E,R,T,A. I tried to use KeyDown and [DllImport("user32.dll")] but both of them has the same result. What is the difference between Y and A keys and how can I solve this problem? int code1 = GetVirtualKeyCode(Keys.Q); int code2 = GetVirtualKeyCode(Keys.W); int code3 = GetVirtualKeyCode(Keys.E); int code4 = GetVirtualKeyCode

问题 I am programming a game in microsoft visual studio c# and I have to catch lot's of keys simultaneously. I can't detect Q,W,E,R,T,Y at the same time but I can detect Q,W,E,R,T,A. I tried to use KeyDown and [DllImport("user32.dll")] but both of them has the same result. What is the difference between Y and A keys and how can I solve this problem? int code1 = GetVirtualKeyCode(Keys.Q); int code2 = GetVirtualKeyCode(Keys.W); int code3 = GetVirtualKeyCode(Keys.E); int code4 = GetVirtualKeyCode

问题 I'm working on programming a Tetris game in Visual C# 2005. This is the most extensive program I have designed yet. I create a shape class and a block class to control the location, movement, and display of the different Tetris pieces. I have moveDown(), moveLeft(), and moveRight() functions for each shape (and corresponding canMoveDown(), canMoveLeft(), canMoveRight() boolean functions that verify it's ok to move). This is all working beautifully. I want to use the down, right, and left

问题 I'm trying to make the background color change when certain keys are held down. For example, when the 'r' key is being held down, the background should be red. When the 'r' key is not being pressed anymore, the background should default to white. $(document).ready(function () { $('body').keydown(function(e){ if(e.keyCode == 114){ $(this).css({'background':'red'}); } if(e.keyCode == 121){ $(this).css({'background':'yellow'}); } }); $('body').keypress(function(e){ if(e.keyCode == 114){ $(this)

问题 I asked a question earlier about keyhooks in vb.net. My current issue is such: I have created a program which should perform a certain action whenever a certain group of keys is pressed at the same time. The program must be able to run in the background, or in the system tray or something. Essentially, this should work like the KeyDown event on a form, except the form in this case is everything. I'm not certain if there is a way to do this directly from within the .net API, but if there is I

问题 I can't figure out how to trigger a keydown event on a textarea element, e.g. imagine i have two textarea elements and when i type something in the first one, I want the second box to show the typing as well, but for a certain reason I have to do it via events. This is what I tried and it doesn't work: <script language="javascript" type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js"></script> <textarea id='first'></textarea> <textarea id='second'><

问题 I have a div element. I need to catch a mouse click on this div while alt-key (keyCode = 17) is pressed. Here is what i've got to catch key press: // Html <div id="targetDiv">I want to put a ding in the universe.</div> // Java-script $(document).ready(function(){ $(window).bind('keydown', function(event){ if ( 17 == event.keyCode ) { // How to catch mouse click on $('#targetDiv') ? } }); }); How to catch mouse click on div while alt-key is pressed? 回答1: You can check the .altKey property, for

问题 This is a bit of a weird one so I figure I'm either missing something obvious or this is a flaw with how these events are implemented in browsers. Let me first summarize an example scenario this issue comes up with before providing an isolated case-example; The arrow keys are used to move the player (as a handleKeyDown function is fired anytime a key is hit anywhere on the page). Likewise, anytime a key is released another function is fired (handleKeyUp). As you (the player) hold the left key