dispatchevent | 易学教程

Re-dispatch KeyboardEvent

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问题 Working on an Angular / TypeScript app, where we have a custom basic text editor. Trying to appropriately handle when a user has a highlighted selection and then hits a key, intending to replace the selection. To handle this, we need to properly remove the "hidden" components that they have selected before inserting their intended content. My initial thought was to: Capture KeyDown event Check if there is a highlighted range selected If yes, delete all of the selected content Re-dispatch the

Intercepting all events, handling, then letting them to object underneath

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问题 I have a page which has an iframe (containing an interactive map) and a canvas positioned over it by z-depth, to draw as if into the map. So neither are a parent of the other, they're just located in the same place. Both the canvas and the map need to be able to handle the same click events: the map (for interaction with it), and the canvas (to set timeouts for map status changes, for selecting objects, etc). I'm having trouble figuring out how one is supposed to get all events to flow from

How to properly initialize an ErrorEvent in javascript?

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问题 I need to fire an ErrorEvent programmatically, but can't figure out how to initialize the properties of the event. The properties are readonly, and initEvent() only initializes the event type, whether it bubbles, and if it's cancellable. I tried var myErrorEvent = new ErrorEvent("error", new Error("This is my error")); and myErrorEvent.initEvent("error", false, true, new Error("This is my error")); or // This function would be defined in IE only. Could not find it in Chrome. myErrorEvent

Leaflet JS - Implementing Gesture Handling to enforce 2 fingered scrolling

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问题 You know when you're on a mobile device and you scroll down a web page which has a google map. The map goes dark and tells you "Use two fingers to move the map". I want to implement exactly this in my Leaflet map. Leaflet doesn't currently offer this kind of functionality out the box. Google refers to this functionality as Gesture Handling. If you set it to "Cooperative" you get the effect I just described. https://developers.google.com/maps/documentation/javascript/interaction It's easy

quick lua下自定义事件处理

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Quick-Cocos2d-x中的事件机制在官方的文档中已经讲解得很清楚了，查看这里。这些方法能处理绝大多数的事件，但如果要实现自定义的事件（例如我们自己实现一个类，对该类添加自定义的事件处理）就需要对类进行扩展了。下面讲讲如何使用自定义（扩展）的事件机制。首先认识一下类EventProxy，就是这个类实现了自定义的消息处理该类有四个函数，分别是： addEventListener removeEventListener removeAllEventListenersForEvent removeAllEventListeners 根据名字就能知道这几个函数的作用。下面以我们定义一个继承自Node的类来了解自定义事件的处理方法定义类EXNode如下： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 local EXNode = class ( "EXNode" , function() return display.newNode() end) function EXNode:ctor() cc.GameObject.extend(self):addComponent( "components.behavior.EventProtocol" )

Flash-AS3: Calling a function in a Class from another Class (Part 2) via DispatchEvent

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问题 Hey this question is in reply to Joel Hooks's comment on an older question of mine (How to call a function in a Class from another Class?) I was able to fix my own problem using a public static var to reference one of my Classes, so in the other class I just needed to use the this keyword so it could be called. instance = this; // in Navigation Class Navigation.instance.introPlayButtonClick(); // in Intro Class Now it seems I'm not doing this in the best or purist way for OOP (can sense

Dispatch MouseEvent

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问题 Is there a way to dispatch MouseEvent , same as dispatchKeyEvent using the KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(listener); that happens before the event transferred to the component ? I know I have 2 options 1) add mouse event to all compoenents recursive 2) use a transparent glasspane Does Java support this , or do I have to use the one of the options above? thank you 回答1: Have you tried java.awt.Component.dispatchEvent(AWTEvent) ? import java.awt.*;

Uncaught InvalidStateError: Failed to execute 'dispatchEvent' on 'EventTarget': The event provided is null

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问题 I am getting weird behavior where javascript event that I am trying to dispatch is not being interpreted as event while when I inspect it is is Event . Then it fails with following error Uncaught InvalidStateError: Failed to execute 'dispatchEvent' on 'EventTarget': The event provided is null. JSFiddle I must be missing something obvious here. $(function () { $("[type='tel']").keydown(function (event) { var position = this.selectionStart; var $this = $(this); var val = $this.val(); if

Dispatch MouseEvent

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Is there a way to dispatch MouseEvent , same as dispatchKeyEvent using the KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(listener); that happens before the event transferred to the component ? I know I have 2 options 1) add mouse event to all compoenents recursive 2) use a transparent glasspane Does Java support this , or do I have to use the one of the options above? thank you Have you tried java.awt.Component.dispatchEvent(AWTEvent) ? import java.awt.*; import java.awt.event.*; import javax.swing.*; JButton jb = new JButton("Press!"); MouseEvent me = new

Why firing a defined event with dispatchEvent doesn't obey the bubbling behavior of events?

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I'm confused with the script below: var event = new Event('shazam'); document.body.addEventListener('shazam',function(){ alert('body'); }); document.addEventListener('shazam',function(){ alert('document'); }); window.addEventListener('shazam',function(){ alert('window'); }); document.body.dispatchEvent(event); When I run this script on my browser, I just get the alert('body'); event. but if i set the capturing parameter of addEventListener (the third optional parameter) to true, all the alerts captured in order they should. Why the shazam event doesn't bubble up ? Patrick Evans You need to set