To get a single callback for the completion of multiple element animations, use deferred objects. $(“.myClass”).animate({ marginLeft: “30em” }).promise().done(function(){ alert(“Done animating”); }); When you call .animate on a collection, each element in the collection is animated individually. When each one is done, the callback is called. This means if you animate eight elements, you’ll get … Read more
It depends on how your $(‘site-header’) is constructed. You can try to use $timeout with 0 delay. Something like: return function(scope, element, attrs) { $timeout(function(){ $(‘.main’).height( $(‘.site-header’).height() – $(‘.site-footer’).height() ); }); } Explanations how it works: one, two. Don’t forget to inject $timeout in your directive: .directive(‘sticky’, function($timeout)
around_* callbacks are invoked before the action, then when you want to invoke the action itself, you yield to it, then continue execution. That’s why it’s called around The order goes like this: before, around, after. So, a typical around_save would look like this: def around_save #do something… yield #saves #do something else… end
A Postback occurs when the data (the whole page) on the page is posted from the client to the server..ie the data is posted-back to the server, and thus the page is refreshed (redrawn)…think of it as ‘sending the server the whole page (asp.net) full of data‘. On the other hand, a callback is also … Read more
For completeness, since StackOverflow RSS just randomly resurrected the question for me, the other (newer) option is to use blocks: @interface MyClass: NSObject { void (^_completionHandler)(int someParameter); } – (void) doSomethingWithCompletionHandler:(void(^)(int))handler; @end @implementation MyClass – (void) doSomethingWithCompletionHandler:(void(^)(int))handler { // NOTE: copying is very important if you’ll call the callback asynchronously, // even with garbage collection! … Read more
While you can run a run loop manually (or, for asynchronous code that doesn’t require a run loop, use other waiting methods like dispatch semaphores), the “built-in” way we provide in playgrounds to wait for asynchronous work is to import the XCPlayground framework and set XCPlaygroundPage.currentPage.needsIndefiniteExecution = true. If this property has been set, when … Read more
Make startsWith accept the word to compare against and return a function which will then be used as filter/callback function: function startsWith(wordToCompare) { return function(element) { return element.indexOf(wordToCompare) === 0; } } addressBook.filter(startsWith(wordToCompare)); Another option would be to use Function.prototype.bind [MDN] (only available in browser supporting ECMAScript 5, follow a link for a shim for … Read more
Check the callable manual to see all the different ways to pass a function as a callback. I copied that manual here and added some examples of each approach based on your scenario. Callable A PHP function is passed by its name as a string. Any built-in or user-defined function can be used, except language … Read more
Rails 5.1+ class Page < ActiveRecord::Base before_save :do_something, if: :will_save_change_to_status_id? private def do_something # … end end The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c6a08383b974ae6c96faac5b4a3c81 Here is a blog post on these changes: https://www.fastruby.io/blog/rails/upgrades/active-record-5-1-api-changes Here is the summary I made for myself on the changes to ActiveRecord::Dirty in Rails 5.1+: ActiveRecord::Dirty https://api.rubyonrails.org/classes/ActiveRecord/AttributeMethods/Dirty.html Before Saving (OPTIONAL … Read more
1) What is a “callback hell” for someone who does not know javascript and node.js ? This other question has some examples of Javascript callback hell: How to avoid long nesting of asynchronous functions in Node.js The problem in Javascript is that the only way to “freeze” a computation and have the “rest of it” … Read more