How do I pass context into setTimeout? I want to call this.tip.destroy() if this.options.destroyOnHide after 1000 ms. How can I do that? if (this.options.destroyOnHide) { setTimeout(function() { this.tip.destroy() }, 1000); } When I try the above, this refers to the window. 6 Answers 6
I have a simplified function that looks like this: function(query) { myApi.exec(‘SomeCommand’, function(response) { return response; }); } Basically i want it to call myApi.exec, and return the response that is given in the callback lambda. However, the above code doesn’t work and simply returns immediately. Just for a very hackish attempt, i tried the … Read more
All I need to do is to execute a callback function when my current function execution ends. function LoadData() { alert(‘The data has been loaded’); //Call my callback with parameters. For example, //callback(loadedData , currentObject); } A consumer for this function should be like this: object.LoadData(success); function success(loadedData , currentObject) { //Todo: some action here … Read more
I’m trying to pass some parameter to a function used as callback, how can I do that? This is my try: function tryMe(param1, param2) { alert(param1 + ” and ” + param2); } function callbackTester(callback, param1, param2) { callback(param1, param2); } callbackTester(tryMe, “hello”, “goodbye”); 14 Answers 14
How to explain callbacks in plain English? How are they different from calling one function from another function taking some context from the calling function? How can their power be explained to a novice programmer? 33 Answers 33 I am going to try to keep this dead simple. A “callback” is any function that is … Read more
In C++, when and how do you use a callback function? EDIT: I would like to see a simple example to write a callback function. 11 Answers 11
What exactly is the difference between array_map, array_walk and array_filter. What I could see from documentation is that you could pass a callback function to perform an action on the supplied array. But I don’t seem to find any particular difference between them. Do they perform the same thing? Can they be used interchangeably? I … Read more
I’ve been developing JavaScript for a few years and I don’t understand the fuss about promises at all. It seems like all I do is change: api(function(result){ api2(function(result2){ api3(function(result3){ // do work }); }); }); Which I could use a library like async for anyway, with something like: api().then(function(result){ api2().then(function(result2){ api3().then(function(result3){ // do work }); … Read more
This question already has answers here: How to return the response from an asynchronous call (43 answers) Closed 7 years ago. This question is asked many times in SO. But still I can’t get stuff. I want to get some value from callback. Look at the script below for clarification. function foo(address){ // google map … Read more
I know how delegates work, and I know how I can use them. But how do I create them? 19 s 19 An Objective-C delegate is an object that has been assigned to the delegate property another object. To create one, you define a class that implements the delegate methods you’re interested in, and mark … Read more
