events

Detect user scroll down or scroll up in jQuery [duplicate]

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To differentiate between scroll up/down in jQuery, you could use: var mousewheelevt = (/Firefox/i.test(navigator.userAgent)) ? “DOMMouseScroll” : “mousewheel” //FF doesn’t recognize mousewheel as of FF3.x $(‘#yourDiv’).bind(mousewheelevt, function(e){ var evt = window.event || e //equalize event object evt = evt.originalEvent ? evt.originalEvent : evt; //convert to originalEvent if possible var delta = evt.detail ? evt.detail*(-40) : … Read more

Is it possible to pass arguments into event bindings?

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You can always use a lambda or another function to wrap up your method and pass another argument, not WX specific. b = wx.Button(self, 10, “Default Button”, (20, 20)) self.Bind(wx.EVT_BUTTON, lambda event: self.OnClick(event, ‘somevalue’), b) def OnClick(self, event, somearg): self.log.write(“Click! (%d)\n” % event.GetId()) If you’re out to reduce the amount of code to type, you … Read more

How do I get the subscribers of an event?

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C# events/delegates are multicast, so the delegate is itself a list. From within the class, to get individual callers, you can use: if (field != null) { // or the event-name for field-like events // or your own event-type in place of EventHandler foreach(EventHandler subscriber in field.GetInvocationList()) { // etc } } However, to assign … Read more

How should I fire Javascript blur event after click event that causes the blur?

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We had a similar problem at work. what we figured out in the end was that the mousedown event will fire before the blur event allowing you to set the content before the validation or even cancel the validation process completely using a flag. check this fiddle I made using your example- http://jsfiddle.net/dL3K3/31/ $(function(){ var … Read more

How to listen to localstorage value changes in react?

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The current answers are overlooking a really simple and secure option: window.dispatchEvent. Where you set your localStorage item, if you dispatch an event at the same time then the eventListener in the same browser tab (no need to open another or mess with state) will also pick it up: const handleLocalStorage = () => { … Read more

Idiomatic jQuery delayed event (only after a short pause in typing)? (aka timewatch/typewatch/keywatch)

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I frequently use the following approach, a simple function to execute a callback, after the user has stopped typing for a specified amount of time:: $(selector).keyup(function () { typewatch(function () { // executed only 500 ms after the last keyup event. }, 500); }); Implementation: var typewatch = (function(){ var timer = 0; return function(callback, … Read more

C# – Event keyword advantages?

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What is the advantage of using the event keyword other than for modifying how the delegate can be accessed? That is the primary advantage of using the event keyword. You use an event over just a raw delegate to prevent the delegate from being invoked or cleared from outside the scope of the class it … Read more