keydown

问题 I am using arrow key navigation for table. Based on current selected row I have to load some details in a div. after selecting a row it will make Ajax call to server to get more details and load that detail in a div. This might take some time to make Ajax call and and update div. Within this time I want to disable key down event. $('#tbl tbody').on('keydown', function (event) { var keyCode = event.keyCode; if (keyCode >= 37 && keyCode <= 40) { event.preventDefault(); ChangeTarget(keyCode) } }

问题 I'm trying to make the classic Snake game in VB.NET, but if I hold a key (any key) during the game, after a few seconds the game freezes until I release the key. I've tried lots to fix this, but nothing works, maybe because I don't understand the problem. I'm assuming that when I hold down a key, the Form1_KeyDown function gets called, and when, after a few seconds, the key goes into "I'm being held down" mode, that function is constantly called, so the timers don't get a chance to update.

问题 I'm trying to make the classic Snake game in VB.NET, but if I hold a key (any key) during the game, after a few seconds the game freezes until I release the key. I've tried lots to fix this, but nothing works, maybe because I don't understand the problem. I'm assuming that when I hold down a key, the Form1_KeyDown function gets called, and when, after a few seconds, the key goes into "I'm being held down" mode, that function is constantly called, so the timers don't get a chance to update.

问题 Hi there is an issue that doesn't really matter when developing a game with pygame but that kept on bothering me for a while. while not gameExit: for event in pygame.event.get():e if event.type == pygame.KEYDOWN: if event.key == pygame.K_RIGHT: pass so above is a working code and I believe while not gameExit: for event in pygame.event.get():e if event.type == pygame.KEYDOWN and event.key == pygame.K_RIGHT: pass works as well. However, when I just try something like "event.key == pygame.K

问题 I'm working on a racing game. I have been using this code but my player keeps moving once only. How do I solve this problem? change = 7 dist = 7 change_r = 0 change_l = 0 dist_u = 0 dist_d = 0 pygame.display.update() for event in pygame.event.get(): if event.type == pygame.KEYDOWN: if event.key == pygame.K_RIGHT: change_r = True elif event.key == pygame.K_LEFT: change_l = True elif event.key == pygame.K_UP: dist_u = True elif event.key == pygame.K_DOWN: dist_d = True if event.type == pygame

问题 I'm currently trying to change the default behaviour of a multiselect element, so that a user can select and deselect multiple values, without having to press the Ctrl key all the while. I found a simple solution here, but this does not work in ie8 (because in ie, the onmousedown does not apply to option elements). But I figured, that one could just simulate a pressed control key, whenever the mouse hovers over a multiselect: $(document).ready(function() { $('select').hover(function(e) { var

问题 I am using PreviewKeyDown event on a window to receive all the keys from a barcode scanner. The KeyEventArgs is an enumeration and does not given me the actual string. I dont want to use TextInput as some of the keys may get handled by the control itself and may not bubble up to the TextInput event. I am looking for a way to convert the the Keys that I get in PreviewKeyDown to actual string. I looked at the InputManager, TextCompositionManager etc but I am not finding a way where I give the

问题 I need to only allow one character to be entered into the editable datagridview cells (every other column, the odd-numbered ones, are editable); if the user adds a second character while in one of these cells, the cursor should move to the next cell down and put that second value there (pressing again on that key moves down again, and so forth). If at the bottom of the grid (the 12th row), it should move to row 0 and also move two columns to the right. I tried doing this: private void

问题 I need to set up an <input type="text" /> so that it will accept only numeric chars, backspace, delete, enter, tabs and arrows. There's a lot of exemple around there, i started with something similar to this: function isNumericKeyCode (keyCode){ return ( (keyCode >= 48 && keyCode <= 57) //standard keyboard ||(keyCode >= 96 && keyCode <= 105)) //Numpad } $('#myTextBox').keydown(function(e){ var handled = true; var keyCode = e.keyCode; switch(keyCode){ //Enter and arrows case 13: case 37: case

问题 I have been working on a Cocoa OSX project in swift that requires the use of keyboard input to preform an action. On keydown i want to move an object across the window, but stop the object as soon as the key is let up. I have looked in the documentation for AppKit and found the KeyDown function but I cannot seem to figure out how to use it. I want to create a function to call in my game update timer that will preform this. Thanks import Cocoa import Appkit @NSApplicationMain class AppDelegate