keydown

问题 This question already has answers here : Prevent JavaScript keydown event from being handled multiple times while held down (7 answers) Closed 3 years ago . When user keeps a key pressed, I want the keydown() event get called only once, but its called until user stops pressing the key. Here is what I am trying to do: $(document).keydown(function(event){ var keycode = (event.keyCode ? event.keyCode : event.which); if(keycode == '39'){ $("#box").animate({"left": "+=30px"}, "fast"); } }); So,

问题 I need to figure out which character was typed into a text field from within the handler that is called by jQuery's keydown function. key.which gives me only the keycode, but I need to figure out which ASCII character key represents. How do I do this? 回答1: For character input, it is suggested you use keypress() , which will report the actual ASCII code for the character pressed. It automatically takes care of letter case, and ignores non-character presses. In either case, you can use

问题 I have the following jQuery code: function showResult(str) { if (str.length == 0) { $('#mySearch').html(''); return; } else { $('#mySearch').load('search/'+str,function(){ $('#mySearch').css({ 'background-color': 'white', 'width': '250px', 'position': 'absolute', 'right': '0' }) }); } $(document).click(function(event) { if ( !$(event.target).hasClass('mySearch')) { $('#mySearch').html(''); $('#main_search').val(''); } }); $(document).keydown(function(e){ if (e.keyCode == 40) { $('#mySearch tr

问题 I just want to "catch" when some user press the TAB key in a Textbox. I'm working in a simple CRUD asp.net application, c# as code behind. I try to do this as a test: private void KeyForm_KeyDown( object sender, KeyEventArgs e ) { keyInfoLabel.Text = "KeyCode: " + e.KeyCode + '\n' + "KeyData: " + e.KeyData + '\n' + "KeyValue: " + e.KeyValue; } But it just works with C# desktop application. 回答1: TAB key can not be catched by KeyPress or KeyDown. so to achieve your requirement use Leave Event

问题 First, thanks for reading this post. I am trying to force participants to read several pictures for 30 seconds each. For some specific pictures, participants are asked to press "K." I wonder how I can record if participants correctly press "K" for the assigned pictures and mistakenly press "K" while seeing those unassigned pictures. I used the two lines to remove the previous/next page buttons. Participants can automatically advance to the next screen after 30 seconds. this.hideNextButton();

问题 When handling key[Up|Down|Press] events, should I use .which or .keyCode? Can I have some example code for handling the three keyboard events in jQuery? Can you do it without jQuery? I want it to work reliably in every browser. Update Strangely, jQuery's event.which normalization wasn't working for my handleKey Press (event) handler: // Add which for key events if ( !event.which && ((event.charCode || event.charCode === 0) ? event.charCode : event.keyCode) ) { event.which = event.charCode ||

问题 I have a table using ng-repeat... I want to be able to allow the users to select an item in the table using the key 'enter' which is equal to the keydown event 13. When a user clicks enter, I want to be able to focus in on the specific table row and make the variable 'selected' to true. When the user clicks on enter the second time, I want the 'selected' field to be set to false. Here is what I have so far, any ideas? html: <tbody ng-model="educators"> <tr ng-keydown="keydownevt()" tabindex=

问题 Below is the sample code. - (void) keyDown: (NSEvent *) event { NSString *chars = [event characters]; unichar character = [chars characterAtIndex: 0]; if (character == 27) { NSLog (@"ESCAPE!"); } } Should I need to set any delegate in InterfaceBuilder or any kinda binding?? Help Appreciated... 回答1: keyDown needs to be overridden in an NSView subclass whose object is set as first responder. The responder chain should pass down the event, but to be sure you get it, make sure that your object is

问题 The problem: I need to obtain the selected text from a window in a Windows application (not my program). I am doing my work in Delphi XE and the software I am attempting to access is a kluge built over the past 15 years with C, C++, VB and who knows what else. I do not have the source code. The edit box (an RTF memo) I am attempting to read is of the class "Ter32Class". When I use wm_copy , nothing goes to the clipboard. when I use wm_gettext , nothing. When I use wm_keydown commands (to

问题 In the code below I am Initialising a NSViewController [a NSResponder], with a NSWindow , a NSOpenGLView , presenting the view and attempting to set the NSViewController as the windows first responder. It is not working. I was expecting to be able to hit a breakpoint in the keyUp: and keyDown: methods also below, but nothing is happening. Am I missing something? -(void)initwithFrame:(CGRect)frame { window = [[MyNSWindow alloc] initWithContentRect:frame styleMask:NSClosableWindowMask |