Given the following examples, why is outerScopeVar undefined in all cases? var outerScopeVar; var img = document.createElement('img'); img.onload = function() { outerScopeVar = this.width; }; img.src = 'lolcat.png'; alert(oute...
I would like to upload a file asynchronously with jQuery. This is my HTML: <span>File</span> <input type="file" id="file" name="file" size="10"/> <input id="uploadbutton" type="butto...
I have service which returns an observable which does an http request to my server and gets the data. I want to use this data but I always end up getting undefined. What's the problem? Service: @Injectable() export class EventService { con...
I am currently reading Async Javascript by Trevor Burnham. This has been a great book so far. He talks about this snippet and console.log being 'async' in the Safari and Chrome console. Unfortunately I can't replicate this. Here is th...
This question already has an answer here: JavaScript closure inside loops – simple practical example 43 answers I am running an event loop of th...
I have an AngularJS service that I want to initialize with some asynchronous data. Something like this: myModule.service('MyService', function($http) { var myData = null; $http.get('data.json').success(function (data) {...
I have just found that in react this.setState() function in any component is asynchronous or is called after the completion of the function that it was called in. Now I searched and found this blog (setState() State Mutation Operation May Be Synch...
According to the docs, "Without middleware, Redux store only supports synchronous data flow". I don't understand why this is the case. Why can't the container component call the async API, and then dispatch the actions? For exampl...
I have code that looks something like this in javascript: forloop { //async call, returns an array to its callback } After ALL of those async calls are done, I want to calculate the min over all of the arrays. How can I wait for all of them...
I have a question regarding the native Array.forEach implementation of JavaScript: Does it behave asynchronously? For example, if I call: [many many elements].forEach(function () {lots of work to do}) Will this be non-blocking?...
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