keypress | 易学教程

Can I intercept control-A keypresses on IE?

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问题 I'm trying to use jQuery to intercept control-A keypresses on my web page, like so: $(document).keypress(function (event) { if (event.ctrlKey && (event.which == 65 || event.which == 97)) { event.preventDefault(); // ... } }); This works on Firefox, but on IE7, my event handler doesn't get called, and all of the text on the page gets selected instead (as happens on Firefox without the event handler). Is there any way I can intercept control-A's on IE? 回答1: This works under FF 3.5 and IE7 for

c++ breaking out of loop by key press at any time

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What I have here is a loop that is supposed to read the output on a piece of equipment every 500 milliseconds. This part works fine. However, when I try to introduce cin.get to pick up the key "n" being pressed to stop the loop, I only get as many outputs as the number of key presses up to this point. If I press any keys (apart from 'n') several times followed by enter, I will get a few more outputs. What I need is the loop keep looping without any interaction until I want it to stop. Here's the code: for(;;) { count1++; Sleep(500); analogInput = ReadAnalogChannel(1) / 51.0; cout << count1*0.5

Detect if key “delete” was pressed with angularJS

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问题 Hi I've got follow code: angular.module("myApp", []).controller("myController", function($scope) { $scope.pressedKey = function(keyObj) { $scope.myKey = keyObj.key; } }); <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> <div ng-app="myApp" ng-controller="myController"> <input ng-keypress="pressedKey($event)"><br>{{myKey}} </div> I use the ng-keypress on an input for detecting if there was a key-event and which key was clicked. I need all numbers

distinguish between keyboard's Real and Virtual key presses

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问题 I'm writing a program in C#, that have to simulate keyboard's key press commands. The problem is - I need to simulate "realistic" keyboard button clicks, not the fake ones. For example, as far as I understand: when user presses any button on the keyboard - the signal is sent via USB, and then proceed via keyboard's driver. when API's are used (SendInput, SendKeys, KeyBoardEvent, or whatever) - we bypass USB and driver, so basically these kind of presses can be tracked via global hook method..

submit a comment on Instagram posts using jQuery or pure javascript

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问题 I need to submit a comment on an Instagram post, using javascript or jQuery, so I use : $('input[placeholder="Add a comment…"]').val('MY COMMENT'); This code fills the comment textbox for and instagram post page like this : And the last thing which I need is triggering of "Enter" button. I've tried codes below that I'd found on stackoverflow but no luck : 1) var ev = document.createEvent('KeyboardEvent'); // Send key '13' (= enter) ev.initKeyboardEvent( 'keydown', true, true, window, false,

Get a textbox to accept only characters in vb.net

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问题 I'm creating a simple application in Vb.net where I need to perform certain validations. So I want a name textbox to accept only characters from a-z and A-Z for example. For this I wrote the following code: Private Sub txtname_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox5.KeyPress If Asc(e.KeyChar) <> 8 Then If Asc(e.KeyChar) > 65 Or Asc(e.KeyChar) < 90 Or Asc(e.KeyChar) > 96 Or Asc(e.KeyChar) < 122 Then e.Handled = True End If End If End

How to make keyPress work with keyListener

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问题 Below is a code from "Simon" in which I have running showing the correct segments that are supposed to be shown but I am have trouble with my keyPress and it will not light up using the arrow keys when I use it. Not really a great coder and I really need some help with this. import java.awt.BasicStroke; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Component; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.ActionListener; import java.awt

How to implement a timer keypress in bash?

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问题 Here's what will happen, a message is displayed with a specified time waiting for keypress, if no keypress then it will resume. Example "Press ESC to exit, otherwise you will die.. 3..2..1" "Press 'x' to procrastinate and check email, read some blogs, facebook, twitter.. otherwise you will resume work for 12 hours.. 3..2..1" This should be a really handy function. How do I create this functionality in bash? 回答1: Look on the bash man page for the "read" command and notice the "-t timeout"

Keypress on tab not working

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问题 <!doctype html> <head> <meta charset="utf-8"> <title>Gazpo.com - HTML5 Inline text editing and saving </title> <link href='http://fonts.googleapis.com/css?family=Droid+Serif' rel='stylesheet' type='text/css'> <style> body { font-family: Helvetica,Arial,sans-serif; color:#333333; font-size:13px; } h1{ font-family: 'Droid Serif', Georgia, Times, serif; font-size: 28px; } a{ color: #0071D8; text-decoration:none; } a:hover{ text-decoration:underline; } :focus { outline: 0; } #wrap{ width: 500px;

Detecting multiple simultaneous keypresses in C#

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问题 I am looking to emulate hyperterminal functionality for my Serial Communication in C# by detecting the keypresses of certain key combinations (escape sequences) which cannot be typed out such as Ctrl+C, Ctrl+Z, etc. I understand that these keys have their ASCII equivalents and can be transmitted as such. But I am facing problems with the detection of multiple keypresses. Some of my code is provided as a reference : private void Transmitted_KeyDown(object sender, KeyEventArgs e) { if (e