keypress

问题 I need to simulate keyboard in google docs with using JavaScript to be able print or erase characters on cursor position. Unfortunately solutions with simulating keypress event didn't work for me. I tried with and without jQuery. After some investigation I detected that Google Docs have virtual keyboard. Clicks on virtual keys calls this function: C.MOa = function(a) { this.dispatchEvent(new Q(Td, {keyCode: a})) }; Where Td is a string "action" and Q some Event class. What is the correct way

问题 I am a total beginner and am learning front-end using a "just do it" and project-focus route. My web app will essentially work similar to that of a to-do list. I assume it is because I have "getElementById" twice for the same element. This works initially: // add idea to list button document.getElementById('btnSubmit').addEventListener("submitIdea", submitIdea); function submitIdea() { var ul = document.getElementsByClassName('anIdea')[0]; var enterIdea = document.getElementById('enterIdea');

问题 I am a total beginner and am learning front-end using a "just do it" and project-focus route. My web app will essentially work similar to that of a to-do list. I assume it is because I have "getElementById" twice for the same element. This works initially: // add idea to list button document.getElementById('btnSubmit').addEventListener("submitIdea", submitIdea); function submitIdea() { var ul = document.getElementsByClassName('anIdea')[0]; var enterIdea = document.getElementById('enterIdea');

问题 I am programming a simple GUI, that will open a opencv window at a specific point. This window has some very basic keyEvents to control it. I want to advance this with a few functions. Since my QtGui is my Controller, I thought doing it with the KeyPressedEvent is a good way. My Problem is, that I cannot fire the KeyEvent, if I am active on the opencv window. So How do I fire the KeyEvent, if my Gui is out of Focus? Do I really need to use GrabKeyboard? The following code reproduces my

问题 I am building a Qt Application for a raspberry pi, which is connected to a rotary encoder. When the user presses the rotary encoder button, the application registers the hardware interrupt from the button and emits a signal which the application can intercept. The challenge is that the application has multiple windows that can be displayed, and I would like to simply have a function which translates the button press signal into a global key press that can be registered by any active window in

问题 So I have Entries which have some values assigned to them from a CFG File. I want to modify the CFG file when the Entry is updated, live, without a submit button; Using <Key> binding will work but will take only the previous value, not the current one, as the last key pressed is not taken into consideration as a value, but as a key-press . For example: class EntryBox: def __init__(self, value, option, section, grid_row, master_e): self.section = section self.option = option self.box = Entry

问题 I have an iframe of Google Slides which I embedded in my web app. The iframe implementation is: <iframe ref={slidesRef} src={src} width='100%' height='100%' allowFullScreen={true}/> I want to listen to click events on the main web page (while the iframe is not necessarily in focus), then create their corresponding keypress events - and pass them to the iframe, thus making the slideshow iframe to trigger and react to the user key presses. I tried something like this: function onButtonClick(e)

问题 I have an iframe of Google Slides which I embedded in my web app. The iframe implementation is: <iframe ref={slidesRef} src={src} width='100%' height='100%' allowFullScreen={true}/> I want to listen to click events on the main web page (while the iframe is not necessarily in focus), then create their corresponding keypress events - and pass them to the iframe, thus making the slideshow iframe to trigger and react to the user key presses. I tried something like this: function onButtonClick(e)

问题 I want to limit user to type just numbers in TextBox. I add this code In keypress Event: private void txtPartID_KeyPress(object sender, KeyPressEventArgs e) { if (((e.KeyChar >= '0') && (e.KeyChar <= '9')) == false) { e.Handled = true; } } but after that BackSpace key don't work for this TextBox. How can I change this? 回答1: You can check for backspace using this, if(e.KeyChar == '\b') And better way to check only for numbers is private void txtPartID_KeyPress(object sender, KeyPressEventArgs

问题 I can make a widget inside another widget, as example an urwid.Frame father could have as body an urwid.Pile widget as child. In this situation, the father should process some input keys when the child have to treat some specific others keys. Like in this functional example: import urwid class NewFrame(urwid.Frame): def __init__(self, givenBody): super().__init__(urwid.Filler(givenBody, "top")) def keypress(self, size, key): if key in ('f'): print("We are in NewFrame object") return super