The best place to demystify this is the source code. The docs are woefully inadequate about explaining this. dispatchTouchEvent is actually defined on Activity, View and ViewGroup. Think of it as a controller which decides how to route the touch events. For example, the simplest case is that of View.dispatchTouchEvent which will route the touch … Read more
Give the child component a ref and use $refs to call a method on the child component directly. html: <div id=”app”> <child-component ref=”childComponent”></child-component> <button @click=”click”>Click</button> </div> javascript: var ChildComponent = { template: ‘<div>{{value}}</div>’, data: function () { return { value: 0 }; }, methods: { setValue: function(value) { this.value = value; } } } new … Read more
Use the oncontextmenu event. Here’s an example: <div oncontextmenu=”javascript:alert(‘success!’);return false;”> Lorem Ipsum </div> And using event listeners (credit to rampion from a comment in 2011): el.addEventListener(‘contextmenu’, function(ev) { ev.preventDefault(); alert(‘success!’); return false; }, false); Don’t forget to return false, otherwise the standard context menu will still pop up. If you are going to use a … Read more
So this is way late, but I’ve discovered an answer, in case it becomes useful to anyone who comes across this thread. Changes in value to hidden elements don’t automatically fire the .change() event. So, wherever it is that you’re setting that value, you also have to tell jQuery to trigger it. function setUserID(myValue) { … Read more
e.target is what triggers the event dispatcher to trigger and e.currentTarget is what you assigned your listener to.
To understand event handlers, you need to understand delegates. In C#, you can think of a delegate as a pointer (or a reference) to a method. This is useful because the pointer can be passed around as a value. The central concept of a delegate is its signature, or shape. That is (1) the return … Read more
As noted in comments, some of this becomes irrelevant in Java 8, where final can be implicit. Only an effectively final variable can be used in an anonymous inner class or lambda expression though. It’s basically due to the way Java manages closures. When you create an instance of an anonymous inner class, any variables … Read more
There’s a couple of ways you can do this. If the onchange listener is a function set via the element.onchange property and you’re not bothered about the event object or bubbling/propagation, the easiest method is to just call that function: element.onchange(); If you need it to simulate the real event in full, or if you … Read more
See How to find event listeners on a DOM node. In a nutshell, assuming at some point an event handler is attached to your element (eg): $(‘#foo’).click(function() { console.log(‘clicked!’) }); You inspect it like so: jQuery 1.3.x var clickEvents = $(‘#foo’).data(“events”).click; jQuery.each(clickEvents, function(key, value) { console.log(value) // prints “function() { console.log(‘clicked!’) }” }) jQuery 1.4.x … Read more
From proper way to do uitextfield text change call back: I catch the characters sent to a UITextField control something like this: // Add a “textFieldDidChange” notification method to the text field control. In Objective-C: [textField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged]; In Swift: textField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged) Then in the textFieldDidChange method you can examine the … Read more