keypress

问题 I am trying to simulate a user pressing a key, holding it for some specific time interval, and then releasing it. I have tried to implement this using SendKeys.Send() , but I cannot figure out how to control the duration of how long the key is pressed. I don't want to just keep sending the same key over and over; I want a single key-down and a single key-up event. For example, I have code like this: //when i press this button, will sent keyboard key "A", i want to hold it until i release

问题 I can only retrieve the value without the newly pressed key. Using the keyup event isn't an option, because it does not fire if the user doesn't release the key. This is important because I want to act upon every single keypress. Combining the old value with the keyCode that is reachable from the event's arguments isn't acceptable either, because it's not guaranteed that the user will type to the end of the string in the textbox. 回答1: It's possible to work out what the value will be after the

问题 I'm creating a <select> replacement using jQuery to replace it with divs and links. Now I want to filter it when I start to type something with the new select open. Like Google Translate does on the language selector. Do you have any advice how do i proceed? I started something with: $(document).bind('keypress', function(event) { //... }); But I capture only single keys, not the whole typed string. Important: I don't have an <input /> to detect the keypress or keyup events on it I prefer not

问题 In UITextView there is a Changed event to handle keypress. However the UITextField has not such event. How can I detect a KeyPress event in UITextField ? There is a method described here using notifications, however the problem I have is that I cannot unsubscribe from the TextFieldTextDidChangeNotification. 回答1: I'm not sure which is your question. The first one you seem to have answered yourself, i.e. the solution (from your link) is to use NSNotificationCenter.DefaultCenter.AddObserver .

问题 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

问题 I have this interesting problem - I would like to read keypresses using javascript, but not directed into a text field. This is straightforward on computers and I have that working (As long as the window has focus, the javascript can detect keypresses). However, on tablets running Android and iOS, the operating system ignores the keypresses. The javascript code only receives the keypress data if I am focused in a text field. Is there some way around this? I would like to read the keypresses

问题 I've been playing around with some ANSI stuff (like colors etc.) in java and php (from scratch) and I'm trying to find a way to basically wait for a key press. I'd like to have something like the following pseudo code at the end of my main event loop: If (KeyPressed) Begin var event = new KeyboardEvent(); event.Key = ReadKey(); this.BubbleEvent(event); End But everything I've been trying over the last couple days fails because the key presses only become available on STDIN after the user has

问题 In my TEdit field I have text in the form <number1>..<number2> . My idea is: When a user enters the control using TAB from another control, number1 gets selected. When my TEdit control has a focus and user presses TAB again, I want the number2 to get selected and number1 to be deselected. And if current caret position is at the place where number2 is, pressing TAB should act normal and move the focus to the next control on the form. I have 2 problems. I cannot catch the tab key press when the

问题 I have a content editable div and I want to modify input character when key press event fired: $('#div').on('keypress', function (e) { e.preventDefault(); $(e.target).trigger(jQuery.Event('keypress', { which: e.which + 1728 })); }); <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> <div id="div" contenteditable> Hi I am a div </div> Why this not work? 回答1: For add a character in contenteditable, you must get cursor position and paste at same position. You

问题 I'm making a 2-D platformer style game with an HTML5 canvas. In it the character can jump and move side-to-side using the arrow keys, it works fine except for one problem. When I jump and move to the side at the same time the sprite goes up and doesn't move to the side. Only when it's coming down it moves properly. Is there a way to fix it? I've done research on other "move sprite diagonally" questions, but according to my code; when I let go of the 'up' key the sprite should move to the side