keypress

问题 I have a custom CMS and would like to add a "shortcuts menu" triggered by the pressing of the Ctrl key twice within, say, 300 milliseconds. I use prototype, so my starting point obviously is: Event.observe(document, 'keypress', function(event) { if(event.keyCode == Event.KEY_XYZ) { show_shortcuts}); My approach at the moment would be populating a global variable with the current time in milliseconds, and checking on each keypress whether a keypress has happened less than 300 milliseconds ago.

问题 I have a custom CMS and would like to add a "shortcuts menu" triggered by the pressing of the Ctrl key twice within, say, 300 milliseconds. I use prototype, so my starting point obviously is: Event.observe(document, 'keypress', function(event) { if(event.keyCode == Event.KEY_XYZ) { show_shortcuts}); My approach at the moment would be populating a global variable with the current time in milliseconds, and checking on each keypress whether a keypress has happened less than 300 milliseconds ago.

问题 I have a custom CMS and would like to add a "shortcuts menu" triggered by the pressing of the Ctrl key twice within, say, 300 milliseconds. I use prototype, so my starting point obviously is: Event.observe(document, 'keypress', function(event) { if(event.keyCode == Event.KEY_XYZ) { show_shortcuts}); My approach at the moment would be populating a global variable with the current time in milliseconds, and checking on each keypress whether a keypress has happened less than 300 milliseconds ago.

问题 In one of my automated tests I need to press Ctrl + V in text box to paste text in it. But I can't do that. I'm using Selenium WebDriver for .net v. 2.35.0.0. Here is my code, it does not work. It presses Ctrl and then V , but text not gets pasted in the box: IWebDriver webDriver = new InternetExplorerDriver(); webDriver.Navigate().GoToUrl(@"C:\Users\us\Documents\Visual Studio 2012\Projects\SeleniumTests\SeleniumTests\test.html"); var el = webDriver.FindElement(By.XPath(".//*[@id='fld']"));

问题 I've disabled X button in Qt from my dialog using this line: myDialog->setWindowFlags(Qt::Dialog | Qt::Desktop) but I couldn't detect Alt + F4 using this code: void myClass::keyPressEvent(QKeyEvent *e) { if ((e->key()==Qt::Key_F4) && (e->modifiers()==Qt::AltModifier)) doSomething(); } what should I do to detect Alt + F4 or disable it in Qt? 回答1: Pressing Alt+F4 results in a close event being sent to your top level window. In your window class, you can override closeEvent() to ignore it and

问题 This question already has answers here : KeyListener, keyPressed versus keyTyped (4 answers) Closed 6 years ago . I have searched about difference between KeyPressed and KeyTyped Events but still I'm not clear about that . One thing I have found is Keypressed is triggered first than KeyTyped . Please clarify me when these are triggered exactly . Which is appropriate to use for which purpose ? Thanks in advance 回答1: keyPressed is fired whenever any key press occurs. keyTyped is fired when a

问题 This question already has answers here : KeyListener, keyPressed versus keyTyped (4 answers) Closed 6 years ago . I have searched about difference between KeyPressed and KeyTyped Events but still I'm not clear about that . One thing I have found is Keypressed is triggered first than KeyTyped . Please clarify me when these are triggered exactly . Which is appropriate to use for which purpose ? Thanks in advance 回答1: keyPressed is fired whenever any key press occurs. keyTyped is fired when a

问题 I need to detect when someone hits "enter" in text inputs with a specific class. My jQuery is as follows: $('input.large').keypress(function (e) { if(e.which ==13) console.log("pressed enter"); }); My HTML is something like this: <tr><td> Personal Name </td></tr> <tr><td> <input type='text' class='large'> </td></tr> <tr><td> Email</td></tr> <tr><td> <input type='text' class='large'> </td></tr> When I've given the fields IDs and tried $('#elementid').keypress it worked. But this isn't working.

问题 I am compiling and executing my programs in cygwin on a windows computer. I am quite inexperienced in C but I would like a way to detect if a key has been pressed without prompting the user(e.g me). My pseudo code with desirable functions is shown below. char ch; while(1){ if(KeyBeenPressed()){ //a key has been pressed before getting here ch=getKeyPressed(); if(ch=='0'){ printf("you have pressed 0"); } else{ printf("you did't press key 0"); } } //do other stuff } And my own try to solving

问题 Why after I press the directional arrow ON, the function GetKeyState continues to give me a value greater than 0? #include <iostream> #include <windows.h> using namespace std; int main() { for(int i = 0; i < 1000; ++i) { if(GetKeyState(VK_UP)) { cout << "UP pressed" << endl; } else cout << "UP not pressed" << endl; Sleep(150); } return 0; } 回答1: From the documentation: The key status returned from this function changes as a thread reads key messages from its message queue. The status does not