I want to listen for changes that are happening in the localStorage API on the same page (Not in multiple tabs like the spec says). I am currently using this code: Does anyone know a vanilla JavaScript way to listen to events on localStorage on one page (no jQuery) Answer Since JS is dynamical language just r…
Tag: events
In this code, copied from ch 15 of eloquent javascript, what does the keyup event listener do?
In the following code, copied from ch 15 of Eloquent Javascript, how does pressed[codes[event.keyCode]] end up as a boolean value? I just can’t figure out why you need the ‘keyup’ event listener. The idea is to make sure that ‘keydown’ gets registered only once when it is being h…
addEventListener firing multiple times for the same handle when passing in arguments with anonymous function
For some reason, the event listener is firing twice for each element when passing arguments into an anonymous function. I.e., the click event on element el will register once and, thus, fire once. But if I want to pass my own arguments to it, it will register and fire twice. The question is why and what’…
Javascript: cancel or let an event continue?
My scenario deals with Kendo UI, but I think it probably applies to JavaScript generally, hence the JavaScript tag. I have a Kendo scheduler with the edit event option set to functionA. In functionA, I create a Kendo window (basically a modal) that asks the user a question; in one case the edit event should c…
Socket.io – listen events in separate files in node.js
For example my idea is: File1.js File2.js This code is for a node server, will I have problems with this code? Answer Nope, just use the same “io” object. File1.js File2.js app.js index.html
Do JavaScript bindings take up memory while not in use?
I have a calendar that I’ve built, and on clicking a day on the calendar, a function is run. You can go month to month on the calendar, and it generates months as it goes. Since every day on the calendar, shown or not, is binded to an event using the class of all the “days,” I’m worrie…
Copying JS events from one element to another
I’m attempting to copy events from one element, to another using pure JS (i.e. not JQuery). The bug I’m hitting, is when there’s multiple events, the last event is used for both. Bit hard to explain, please refer to my jsbin example, I want to copy the mousedown and mouseup events from #foo …
How to run a function only once when it’s triggered by both focus and click events
I have an input element with 2 events attached: focus and click. They both fire off the same helper function. When I tab to the input, the focus event fires and my helper is run once. No problems there. When the element already has focus, and I click on it again, the click event fires and my helper runs once.
On an EventEmitter, how can I know all the events I can listen to?
Supposing I have an object that inherited from EventEmitter, like a stream or any other, is there a good way to know all the events I can listen to, and all the attached event listeners ? I think the second part of the question is easy, emitter.listeners(event) will tell me all the listeners to an event. But …
How to create an event handler for a range slider?
I’m trying to get a range slider to work but I can’t. How do I add an event handler so when the user chooses a value my code reads that value. Right now its value is always 1. I would like to do this using pure Javascript. HTML: JAVASCRIPT: JSFIDDLE Answer Single Read The problem is that you’…