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Questions tagged [asynchronous-javascript]

Asynchronous JavaScript is a technique to load JavaScript asynchronously using async and defer attributes or script tag injection. Not to be confused with AJAX.

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How to make setting state with useEffect() to run on page refresh?

My code is not long or complicated at all. It's simple. so please read! (Im using react + next.js) In the root file, app.js, I have useEffect to fetch photo data. This data array will be used in a page component so I pass it down from app.js via…
user18553387
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Creating a soundtrack app in JavaScript to search and display tracks

I'm trying to build a small JavaScript program which allows the users to enter a search query, and then find the results of these query and display them through an asynchronous request. Below you can find what I tried so far, but it doesn't display…
Andrea Berger
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React.js: Fetching Data from API with Bearer Token

I am building a React.js SPA, that receives data from an API with Bearer Token Authentication (so a fetch request for authentication has to be done first and the given token can be used temporarily to access the data until the auth session ends) I…
David
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Looping over JSON objects synchronously NodeJS

I'm requesting a JSON API then doing a for each loop over a JSON object and want a way to know once it's complete. This is my current for each loop Object.entries(jsonbody.data.users).forEach(([key, value]) => { //code to run for each user }); At…
Charlie Simon
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Working with custom modules having asynchronous code node js

So, I have a file data.js(the custom module) with the following rough code(to not waste time understanding the whole code): let data; async function(){ data = await something; //the await returns an array, so data has an…
Haebel
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Call a method in child component only after parent completes re-render

I have a graph with lower graphic quality displayed by a parent component. HeatMap has a child component, . MyButton is basically a button, which is dowloads the graph image. My requirement is: after button is clicked,…
Amiay Narayan
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Typescript: how to call json() method on result of promise when result could be of type Response or void?

In my React Native app I make an API call and then try to apply the json() method to the result, like this: await fetch(...) .catch(e => {...}) .then(res => res.json().then(...) Typescript throws a warning on json() saying Property 'json' does…
gkeenley
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Passport, Bcryptjs, Async/Await: verify function passes any input in password as true

Everything in my passport-local strategy seems to be working, except the verifyCallback, where the truthiness evaluation of the validatesPassword function returns true regardless. The problem could stem from the fact that validatesPassword is an…
DeltaFlyer
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I am getting an error in my map function returning React component

This is my code, in which I am running a map function on an array of objects, there are 2 condition check for each object, there is an async operation in the first condition and then the return statement. The error is this- Uncaught Error: Objects…
Arun Pratap Singh
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nodejs api not showing product for a particular product id

I'm trying to create a basic nodejs API(No Framework) My Folder Structure is controllers productController.js models productModels.js data products.js node_modules package.json package-lock.json server.js I'm trying to send product…
Nishant Kumar
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Is there a way to write asynchronous code/function without any involvement of Web APIs?

I know it sound stupid because javascript is single threaded but can't help thinking about a function which takes unusual amount time with no involvement from web APIs like this console.log("start") function apple() { let appleCount = 10; …
AbHisheK ThaKur
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Using AfterEach with different file module in NodeJS getting different values

I'm quite new in using Node JS, and I have been working on a test script that take screenshots whenever a test fails. And I'm trying to do this without the use of Jasmine reporter. I tried to use this approach instead Check if test failed in…
Nicolo_
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Callback function returning promise instead of the value

I'm using fetch to grab data from a json file. In a .then(), I call a callback to do something with that data, and then eventually return the final value from the callback. The problem is that, when I return, it returns a promise instead of the…
ternt
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Manage bootstrap modal with javascript

Good evening guys, I program a symfony website by using webpack encore bundle to manage js & css. I used to work with jquery which is quite simple, but would like to evolve to pure javascript. I try to translate the following code in javascript…
juuk
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Using YouTube API in a *blocking* way in JS

For a side project I'm working on, and for the sake of learning some more JS, I was playing with the YouTube API examples, trying to see how they work. In Google's own documentation for getting playlists for a given YT channel we have the following…
Redoman
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