keydown

问题 I am using a 'keydown' event to replace specific characters typed in an input textbox. When I use: document.getElementById('inputText').onkeydown = handleInputTextKeydown; or the JQuery equivalent: $('#inputText').on('keydown',handleInputTextKeydown); I get the expected result - e.g. the keypress Shift+i displays as 'í'. However if I use addEventListner as the keydown hook: var tb = document.getElementById('inputText'); tb.addEventListener('keydown', handleInputTextKeydown, false); the input

问题 How can I detect keyboard events in a SwiftUI view on macOS? I want to be able to use key strokes to control items on a particular screen but it's not clear how I detect keyboard events, which is usually down by overriding the keyDown(_ event: NSEvent) in NSView. 回答1: There is no built-in native SwiftUI API for this, so far. Here is just a demo possible approach. Tested with Xcode 11.4 / macOS 10.15.4 struct KeyEventHandling: NSViewRepresentable { class KeyView: NSView { override var

问题 How can I detect keyboard events in a SwiftUI view on macOS? I want to be able to use key strokes to control items on a particular screen but it's not clear how I detect keyboard events, which is usually down by overriding the keyDown(_ event: NSEvent) in NSView. 回答1: There is no built-in native SwiftUI API for this, so far. Here is just a demo possible approach. Tested with Xcode 11.4 / macOS 10.15.4 struct KeyEventHandling: NSViewRepresentable { class KeyView: NSView { override var

问题 I am trying to capture keydown events where specific keys correspond to specific audio clips to be played. I've been searching but I am stumped. It seems that the keydown event is only available in the window/document object. Is this correct? Ive seen some talk of jQuery plugins, although i would like to stay away from jQuery. Vanilla JS is ideal. I have 2 DIVS that I want to listen for keydown events on at the same time. Based on which keys are pressed, the function plays the corresponding

问题 How do you get the character appropriate for the given KeyDown event in WPF? 回答1: public enum MapType : uint { MAPVK_VK_TO_VSC = 0x0, MAPVK_VSC_TO_VK = 0x1, MAPVK_VK_TO_CHAR = 0x2, MAPVK_VSC_TO_VK_EX = 0x3, } [DllImport("user32.dll")] public static extern bool GetKeyboardState(byte[] lpKeyState); [DllImport("user32.dll")] public static extern uint MapVirtualKey(uint uCode, MapType uMapType); [DllImport("user32.dll")] public static extern int ToUnicode( uint wVirtKey, uint wScanCode, byte[]

问题 I have been working on a little game and I encountered with this problem and I can't figure out how to solve it. Everything worked fine until I put a checkBox on the form. How can I reach that to use the checkBox and the control at the same time and not to break the control loop with the checkBox. Here is my code: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading

问题 Why this code works with the alert line commented, but dont work when not commented? I want block the form submit, but allow other functions on enter (example, do $.get() in other page). Sorry for my bad english. $(document).ready(function() { $('#txtPesquisaServidor').keydown(function(event){ if(event.keyCode == 13) { //alert('enter!'); event.preventDefault(); return false; } }); }); I'm using Jquery 1.6.2. EDIT: Done! The problem was the alert https://jsfiddle.net/o0mkjnwk/1/ 回答1: Instead

问题 Why this code works with the alert line commented, but dont work when not commented? I want block the form submit, but allow other functions on enter (example, do $.get() in other page). Sorry for my bad english. $(document).ready(function() { $('#txtPesquisaServidor').keydown(function(event){ if(event.keyCode == 13) { //alert('enter!'); event.preventDefault(); return false; } }); }); I'm using Jquery 1.6.2. EDIT: Done! The problem was the alert https://jsfiddle.net/o0mkjnwk/1/ 回答1: Instead

问题 How can I dynamically detect the characters in a DataGridView cell(while it is being edited)? For example, I have a Winforms application with a DataGridView and a TextBox private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { if (e.Control is TextBox) { var tbox = (e.Control as TextBox); // De-register the event FIRST so as to avoid multiple assignments (necessary to do this or the event // will be called +1 more time each time it's

问题 How can I dynamically detect the characters in a DataGridView cell(while it is being edited)? For example, I have a Winforms application with a DataGridView and a TextBox private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { if (e.Control is TextBox) { var tbox = (e.Control as TextBox); // De-register the event FIRST so as to avoid multiple assignments (necessary to do this or the event // will be called +1 more time each time it's