to pass the event object: <p id=”p” onclick=”doSomething(event)”> to get the clicked child element (should be used with event parameter: function doSomething(e) { e = e || window.event; var target = e.target || e.srcElement; console.log(target); } to pass the element itself (DOMElement): <p id=”p” onclick=”doThing(this)”> see live example on jsFiddle. You can specify the name … Read more
You need to use named functions. Also, the click variable needs to be outside the handler to increment. var click_count = 0; function myClick(event) { click_count++; if(click_count == 50) { // to remove canvas.removeEventListener(‘click’, myClick); } } // to add canvas.addEventListener(‘click’, myClick); EDIT: You could close around the click_counter variable like this: var myClick = … Read more
The cause is simple to explain: while an event handler is subscribed, the publisher of the event holds a reference to the subscriber via the event handler delegate (assuming the delegate is an instance method). If the publisher lives longer than the subscriber, then it will keep the subscriber alive even when there are no … Read more
For the specific question “Will pClass be garbage collected”: the event subscription has no effect on the collection of pClass (as the publisher). For GC in general (in particular, the target): it depends whether MyFunction is static or instance-based. A delegate (such as an event subscription) to an instance method includes a reference to the … Read more
Not all browsers support event capturing (for example, Internet Explorer versions less than 9 don’t) but all do support event bubbling, which is why it is the phase used to bind handlers to events in all cross-browser abstractions, jQuery’s included. The nearest to what you are looking for in jQuery is using bind() (superseded by … Read more
The problem is autofill is handled differently by different browsers. Some dispatch the change event, some don’t. So it is almost impossible to hook onto an event which is triggered when browser autocompletes an input field. Change event trigger for different browsers: For username/password fields: Firefox 4, IE 7, and IE 8 don’t dispatch the … Read more
PyPI packages As of January 2022, these are the event-related packages available on PyPI, ordered by most recent release date. pluggy 1.0.0: August 2021 pymitter 0.3.1: June 2021 zope.event 4.5.0: Sept 2020 python-dispatch 0.1.31: Aug 2020 RxPy3 1.0.1: June 2020 Louie 2.0: Sept 2019 PyPubSub 4.0.3: Jan 2019 pyeventdispatcher 0.2.3a0: 2018 buslane 0.0.5: 2018 PyPyDispatcher … Read more
DOM event delegation is a mechanism of responding to ui-events via a single common parent rather than each child, through the magic of event “bubbling” (aka event propagation). When an event is triggered on an element, the following occurs: The event is dispatched to its target EventTarget and any event listeners found there are triggered. … Read more
The C# specification explicitly states (IIRC) that if you have two anonymous functions (anonymous methods or lambda expressions) it may or may not create equal delegates from that code. (Two delegates are equal if they have equal targets and refer to the same methods.) To be sure, you’d need to remember the delegate instance you … Read more
Working DEMO This is a classic JavaScript closure problem. Reference to the i object is being stored in the click handler closure, rather than the actual value of i. Every single click handler will refer to the same object because there’s only one counter object which holds 6 so you get six on each click. … Read more