event-handling – Page 10

Vanilla JavaScript version of jQuery .click

March 1, 2023 by Tarik

Working Example: http://jsfiddle.net/6ZNws/ Html <a href=”https://stackoverflow.com/questions/7556564/something”>CLick Here</a> <a href=”https://stackoverflow.com/questions/7556564/something”>CLick Here</a> <a href=”https://stackoverflow.com/questions/7556564/something”>CLick Here</a> Javascript: var anchors = document.getElementsByTagName(‘a’); for(var z = 0; z < anchors.length; z++) { var elem = anchors[z]; elem.onclick = function() { alert(“hello”); return false; }; }

Touch move getting stuck Ignored attempt to cancel a touchmove

March 1, 2023 by Tarik

The event must be cancelable. Adding an if statement solves this issue. if (e.cancelable) { e.preventDefault(); } In your code you should put it here: if (this.isSwipe(swipeThreshold) && e.cancelable) { e.preventDefault(); e.stopPropagation(); swiping = true; }

How to decode character pressed from jQuery’s keydown()’s event handler

February 27, 2023 by Tarik

The keyPress event is what you need to get which character was entered. (See below workaround for keydown event). keydown and keyup provide a code indicating which key is pressed, while keypress indicates which character was entered. Using jQuery e.which you can get the key code and using String.fromCharCode you can get the specific character … Read more

Android Overriding onBackPressed()

February 27, 2023 by Tarik

Yes. Only override it in that one Activity with @Override public void onBackPressed() { // code here to show dialog super.onBackPressed(); // optional depending on your needs } don’t put this code in any other Activity

Do you need to remove an event handler in the destructor?

February 24, 2023 by Tarik

Since PPMM is a long-lived object (singleton), then this code doesn’t make much sense. The problem here is that as long as that event handler is referencing the object, it will not be eligible for garbage collection, as least as long as that other object that owns the event is alive. As such, putting anything … Read more

Difference between the KeyDown Event, KeyPress Event and KeyUp Event in Visual Studio

February 21, 2023 by Tarik

The MSDN documentation states the order in which the three events occur fairly clearly: Key events occur in the following order: KeyDown KeyPress KeyUp KeyDown is raised as soon as the user presses a key on the keyboard, while they’re still holding it down. KeyPress is raised for character keys (unlike KeyDown and KeyUp, which … Read more

Is it bad practice to write inline event handlers

February 18, 2023 by Tarik

It’s absolutely fine – although there are two caveats: If you’re modifying a local variable from within a closure, you should make sure you understand what you’re doing. You won’t be able to unsubscribe from the event Typically I only inline really simple event handlers – for anything more involved, I use lambda expressions (or … Read more

How to overwrite jquery event handlers

February 11, 2023 by Tarik

As of jQuery 1.7 you should be using off to remove event handlers and on to add them, though you can still use the click shorthand. $(‘#clickme’).off(‘click’).on(‘click’, fireclick); $(‘#clickme’).off().on(‘click’, fireclick); Original answer: If you want to replace all click handlers, call unbind first without a function argument. If you want to replace all event handlers, … Read more

C#: Difference between ‘ += anEvent’ and ‘ += new EventHandler(anEvent)’

February 10, 2023 by Tarik

There is no difference. In your first example, the compiler will automatically infer the delegate you would like to instantiate. In the second example, you explicitly define the delegate. Delegate inference was added in C# 2.0. So for C# 1.0 projects, second example was your only option. For 2.0 projects, the first example using inference … Read more

What is an “event emitter”?

February 9, 2023 by Tarik

It triggers an event to which anyone can listen. Different libraries offer different implementations and for different purposes, but the basic idea is to provide a framework for issuing events and subscribing to them. Example from jQuery: // Subscribe to event. $(‘#foo’).bind(‘click’, function() { alert(“Click!”); }); // Emit event. $(‘#foo’).trigger(‘click’); However, with jQuery in order … Read more