What causes a javascript function to not run it's callback

What causes a javascript function to not run it's callback

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What causes a javascript function to not run it's callback
Tag : javascript , By : Sanoran
Date : November 29 2020, 12:01 PM

will help you
I have tried debugging and found that all values are normal while going inside the classify() function, but it simply doesn't execute its callback and it is skipped

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Jquery/Javascript - add a callback to my small function, apply that specific callback only when i choose to

Tag : javascript , By : adrianmooreuk
Date : March 29 2020, 07:55 AM
Does that help You need to pass a reference to flashArrow, not the result of calling flashArrow():
case "header": 
case "wrapper": 
    scrollMyScreen(flashArrow);   // change here

A function that takes a callback and creates a new version of the callback that can only be called once. Javascript

Tag : javascript , By : jim
Date : March 29 2020, 07:55 AM
this one helps. Your function once does not return anything, and your function call does not call anything. Make it
function once(func) {
    var hasActionBeenCalled = false;
    return function() { 
        if (!hasActionBeenCalled) {
            hasActionBeenCalled = true;
            return func.apply(this, arguments);
function once(func) {
    var res;
    return function() { 
        if (typeof func == "function") {
            res = func.apply(this, arguments);
            func = null; // unset func
        return res;

Javascript add callback function to passed callback variable

Tag : javascript , By : user107506
Date : March 29 2020, 07:55 AM
Does that help If you just want to show a loader (and nothing in the passed callback should care about it), change this line successButton.onclick = confirmCallback; to:
successButton.onclick = function() {
successButton.onclick = function() {

How to assign a variable in callback function in a callback function in javascript

Tag : javascript , By : chad
Date : March 29 2020, 07:55 AM
it should still fix some issue Your code doesn't wait for the files to get read and have the result pushed to result before moving on. Where you're doing asynchronous operations on items in an array, I would recommend using promises and using Promise.all() to wait for each file to get read and processed before you try using the result. You could do something like this:
function create_indicators() {
    const result = fs.readdirSync('../data/7XXX7/files/').map(file => 
        new Promise((resolve, reject) => {
            fs.readFile('../data/7XXX7/files/' + file, 'utf8', (err, data) => {
                if (err) reject(err);
                // do whatever
                if ($.poids || /* ... */ $.saturation) {
                    // ...
                    resolve($); // instead of `result.push($);`
                } else {
                    resolve(); // can't reject for `Promise.all()` to work
    return Promise.all(result).then(items => items.filter(item => item));

create_indicators().then(indicators => {
    // do something with your list of indicators
}).catch(err => {
    // handle error

JavaScript function(callback).then(), callback executes after then

Tag : javascript , By : mckasty
Date : March 29 2020, 07:55 AM
around this issue I know you didn't really ask, but…
Part of the reason the code is difficult to debug is because you are using callbacks when you don't need to and mixing them with promises. These are two different async paradigms that are normally better off separate. You can get rid of the callback in your code in a way that will make it much more readable.
const getItem = (key) => Expo.SecureStore.getItemAsync(key);
authorizedPost() {
  getItem('token').then(val => {
    this.setToken(val)           // the order is now obvious
  .catch((error) => console.log(error))
let Expo = {
  SecureStore: {
    getItemAsync() {
      return new Promise((resolve, reject) => setTimeout(() => resolve("someFancyToken"), 1000))

class Post {
  constructor() {
    this.token = false;
  post() {
    console.log('Token: ' + this.token);
  setToken(token) {
    console.log('Set token.');
    this.token = token;
  authorizedPost() {
    getItem('token').then(val => {
      .catch((error) => console.log(error))

const getItem = (key) => Expo.SecureStore.getItemAsync(key);

let post = new Post();
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