events

问题 I just can't understand what window.event() does in JavaScript. It is used without any definition. Same thing for document.event() . I also don't understand the difference between these two. Do they accept any arguments? 回答1: An event is something that is called when something happens, so for example click and keypress are events. The reason however for window.event() is for cross browser compatibility. So here is some javascript: object.onclick = function(e) { // e holds all of the

问题 There is a function OPEN in my javascript which is called when the user either blur (lose focus on the input field) or hit Enter. Then within OPEN(), depending on whether it was triggered by blur or keypress, it leads to two different other functions. For the Keypress, I did it like this. if (e.keyCode==13) ENTER_FX(); How do you do this for BLUR Thank you UPDATE: I found that it should be e.type=="focusout" So is focusout the right word instead of blur? 回答1: WORKING JSFIDDLE EXAMPLE e.type

问题 There is a function OPEN in my javascript which is called when the user either blur (lose focus on the input field) or hit Enter. Then within OPEN(), depending on whether it was triggered by blur or keypress, it leads to two different other functions. For the Keypress, I did it like this. if (e.keyCode==13) ENTER_FX(); How do you do this for BLUR Thank you UPDATE: I found that it should be e.type=="focusout" So is focusout the right word instead of blur? 回答1: WORKING JSFIDDLE EXAMPLE e.type

问题 I am having two WPF (from the standard set) widgets A and B. When I change some property of A it should be set on B, when it is change in B it should be set on A. Now I have this ugly recursion --> I change A, so code changes B, but since B is changed, it changes A, so it changes B... You have the picture. How to avoid this recursion the most "standard" way? Naive deleting and adding event handlers does not work, and checking if the new value is the same as old value is not applicable here

问题 I am having two WPF (from the standard set) widgets A and B. When I change some property of A it should be set on B, when it is change in B it should be set on A. Now I have this ugly recursion --> I change A, so code changes B, but since B is changed, it changes A, so it changes B... You have the picture. How to avoid this recursion the most "standard" way? Naive deleting and adding event handlers does not work, and checking if the new value is the same as old value is not applicable here

问题 I have a Chrome extension that tracks the order in which tabs are accessed by listening for tab-related events like tabs.onActivated , onRemoved , etc. It uses an event page instead of a persistent background page to add the event listeners. The tab access order is stored in chrome.storage.local . The extension works fine while in the normal course of using the browser. But when Chrome is first launched and restores the previous session, it reopens the windows in the order they were

问题 I have a Chrome extension that tracks the order in which tabs are accessed by listening for tab-related events like tabs.onActivated , onRemoved , etc. It uses an event page instead of a persistent background page to add the event listeners. The tab access order is stored in chrome.storage.local . The extension works fine while in the normal course of using the browser. But when Chrome is first launched and restores the previous session, it reopens the windows in the order they were

问题 I wrote this: import pygame finish = False while not finish: for event in pygame.event.get(): if event.type == pygame.QUIT: finish = True if event.type == pygame.KEYDOWN: if event.key == pygame.K_UP: print "A" if event.key == pygame.K_RIGHT: print "B" if event.key == pygame.K_LEFT: print "C" Why can't I press two buttons at the same time? 回答1: The keyboard events (e.g. pygame.KEYDOWN ) occure only once when a button is pressed. Use pygame.key.get_pressed() to continuously evaluate the states

问题 I wrote this: import pygame finish = False while not finish: for event in pygame.event.get(): if event.type == pygame.QUIT: finish = True if event.type == pygame.KEYDOWN: if event.key == pygame.K_UP: print "A" if event.key == pygame.K_RIGHT: print "B" if event.key == pygame.K_LEFT: print "C" Why can't I press two buttons at the same time? 回答1: The keyboard events (e.g. pygame.KEYDOWN ) occure only once when a button is pressed. Use pygame.key.get_pressed() to continuously evaluate the states

问题 Suppose you have a button on a form that counts to 1000 in a textbox and then clears it. If I quickly click the button five times (in runtime) the Click event handler will be called 5 times and I will see the count to 1000 five times. Is it possible to disable other clicks on that button while the first click is counting? Note: Disabling the button in the first statement of the click handler and then re-enabling at the end does not work. Also, unsubscribing/subscribing to the click event (the