Questions tagged [callback]

A callback refers to a code snippet (like the location or pointer of a function, method, or lambda expression) that is provided as input to another section of code. The purpose of this is for the other code to invoke (execute) the callback at an appropriate moment. This tag is relevant when discussing APIs that utilize callbacks to inform the caller about the completion of an action. For inquiries regarding event subscriptions, particularly within a graphical user interface framework, it is advisable to employ the event-handling tag.

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Receiving a triggered event from a nested component or within an mdDialog

Developing with Angular 1.5 and Material Design, I have successfully created a component that serves as a panel for creating a foobar. This panel includes a "cancel" button which triggers a callback function when clicked. The challenge arises from the fact ...

Merging PHP Webservice with C# Client for Enhanced Functionality

In my C#/Winforms application, I am using PHP webservices. One PHP webservice called uploadFile.php is responsible for uploading a blob file (e.g., by a unix application) to a MySQL database. Another webservice, getFile.php, is used to retrieve the file if ...

c#php web-services callback

Surprising outcome arising from simultaneous execution of numerous asynchronous operations on every individual object within an array

I'm fairly new to working with Node.js and I'm still trying to grasp the concept of callbacks and the asynchronous nature of Node.js. However, I've encountered a problem that I can't seem to solve. I've already searched extensively on online forums and doc ...

javascript node.js asynchronous callback async.js

What is preventing me from assigning to a class variable within a $http success handler?

During the course of my project, I have encountered a perplexing situation that is difficult to comprehend. My intuition tells me that the issue lies in a peculiar nuance of javascript while I am working in TypeScript. Unfortunately, I am unable to prove t ...

angularjs typescript callback typeerror handle

Getting the value returned by http.request in an app.get method using express.js

When attempting to deliver data from an API on another domain using app.get, I am able to write the data to the console successfully. However, the data is not showing up on the page ('~/restresults'). This is the current code I have: app.get('/restresult ...

javascript node.js http express callback

Using a callback function with jQuery in a focus event

Is there a way to ensure that a callback function inside a focus() is only played once while the element has focus? For example, in the code snippet below, the alert('ok') will continue to be triggered as long as the textarea maintains focus. Is ...

jquery callback focus

Confusion with Javascript callbacks - seeking clarity

I am having difficulty grasping the concept of callback functions. I know that they are functions passed as parameters to other functions. My assumption was that when a function is passed as a parameter, it would be recognized as a callback function and ex ...

javascript callback

dojo.xhrGet not triggering callback function in Internet Explorer

My current challenge involves utilizing dojo.xhrGet to retrieve JSON data from a PHP file. Although it works seamlessly in Firefox, I have encountered compatibility issues with Internet Explorer and occasional inconsistencies with Chrome. The main proble ...

ajax dojo callback xmlhttprequest

Partially accessible Angular service within a callback function

I'm currently facing an issue in my Angular simple app related to a factory that is not fully available within a callback function. You can check out a simplified version of the application on this Plunkr link. Here's a snippet of the code: The controll ...

javascript angularjs callback angularjs-service

Exploring the world of data management and callback functions in React native and React navigation

I'm currently working on developing a mobile app to learn React Native. The app is quite basic, as it simply displays the current weather of predefined cities using API calls. Check out some screenshots I took below! HomeScreen View, UserSettings Vie ...

reactjs react-native react-hooks callback

What is the best way to execute a sequence of consecutive actions in a protractor test?

To achieve logging in, verifying, and logging out with multiple users, I decided to use a loop. I came across a helpful post that suggested forcing synchronous execution. You can find it here. Below are the scripts I implemented: it('instructor se ...

javascript selenium asynchronous callback protractor

What is the correct way to pass the res object into the callback function of a jest mock function?

Currently, I am working on developing a web server using Node.js and am in the process of ensuring comprehensive test coverage with Jest. One specific function, logout, requires testing within the if statement where it checks for errors. // app.js functio ...

javascript node.js express callback jestjs

What is the best way to transform these nested callback-heavy functions into async await or promises?

I'm relatively new to Node.js and I need to execute a series of functions one after the other, as they are interdependent. Initially, I opted for the callback function approach where I invoked another callback, essentially creating nested callbacks in ...

node.js promise async-await callback

When using lambda functions with async.parallel, the last callback function may not be executed

I have created a lambda function in node.js with two files - index.js and loader.js. The problem I am facing is that the callback function in index.js is not being executed after the method in loader.js completes its execution. Below is the code: var yat ...

node.js amazon-web-services callback aws-lambda

Node.js Named Function to Escape the Callback Abyss is experiencing technical difficulties

I've been trying to tackle the issue of callback hell by utilizing the named function technique, but unfortunately, the callbacks are not functioning as expected. Instead, an error message saying TypeError: callback is not a function keeps appearing. ...

node.js callback

utilize a Vue animation complete callback to incorporate a function

Can a function be passed inside the "done" callback for Vue animation? enter: function(e, done) { element.animate({ // ... }, duration, done) } Is there a way to ensure that the next "afterEnter" hook will still be called? If I wer ...

vue.js animation callback hook

Using Selenium to handle asynchronous JavaScript requests

Having recently started working with Selenium and JavaScript callback functions, I've encountered a problem that I can't seem to solve on my own. My issue revolves around needing to retrieve a specific variable using JavaScript. When I manually i ...

javascript function selenium asynchronous callback

Is it possible for an AJAX request to return both HTML data and execute callback functions simultaneously?

Is it possible to update the content of an HTML div and call a JavaScript function with specific parameters obtained through AJAX after the completion of the AJAX request, all within a single AJAX call? ...

javascript ajax callback

Click event binding with getter/setter in jQuery

Is there a way to replace this timeout with a getter/ setter? I want the images in the filter gallery to be sorted based on the globalVariable value when a user clicks on a section. Currently, I am using a timeout which stops working after one click. I ha ...

jquery callback get set getter-setter

The callbacks in NextAuth do not appear to be functioning

I am currently working on implementing authentication with NextAuth in my Next.js app. I've noticed that the callbacks from the GoogleProvider are not being executed. Even after adding a console log statement, I cannot see any output in the console. Additi ...

javascript authentication next.js callback next-auth

Testing AngularJS applications using Jasmine for mocking callbacks

Although I have a good grasp on Angular JS, I'm relatively new to Jasmine unit testing. Here's the challenge I'm facing: I want to conduct a test on a service method (specifically from myService): myService.method = function(args) { var parameter = " ...

angularjs testing callback jasmine

Ways to effectively pass arguments to the callback function within the catch function in JavaScript

While working on my code, I suddenly felt the need to pass an extra argument, "msg", to the callback function renderError(). This extra argument should be passed along with the default error argument generated by the catch function itself. I tried doing i ...

javascript callback asynccallback

Javascript callback function cannot access variables from its parent function

As a Javascript newbie, I am currently diving into callbacks for my project. The goal is to retrieve address input from multiple text boxes on the HTML side and then execute core functionalities upon button click. There are N text boxes, each containing an ...

javascript html callback

Need a jQuery callback function in PHP that only retrieves the value without any redirection

Initially, I expected this task to be simple but it turns out my skills are a bit rusty. The snippet of javascript/jquery code that I am using is: $.get("plugin.php", {up_vote:surl}, function(data){ //alert(data); document.getElementById(&apo ...

php javascript jquery http-redirect callback

can you explain which documents outline the parameters that are passed into the express app.METHOD callback function?

As a beginner in javascript and nodejs, I often struggle with understanding callback functions. One thing that particularly confuses me is determining what arguments are passed into a callback function. Let's consider the following example: app.get('/', ...

javascript node.js express callback

Express session cannot be set within a callback function

Although there are similar questions, none have provided the solution I need. I'm utilizing the client-session module. Followed the documentation precisely, yet facing issues setting session values from async callback. Here's my code snippet: router.get ...

node.js express cookies callback cookie-session

Why are PHP Callbacks important in programming?

I'm curious about the appropriate use cases for PHP Callback functions and the advantages they offer over traditional functions. For instance The usual method of converting a name to lowercase <?php function string($string){ $result = array( ...

php callback

Accessing data from arrays asynchronously using JavaScript

Update I have included actual code below, in addition to the concept provided earlier. Here is the async array access structure I am trying to implement: for (p = 0; p < myList.length ; p++){ for (k = 0; k < RequestList.length; k++){ i ...

javascript ajax asynchronous callback promise

Utilizing an Ajax call within "for" loops can result in skipping either odd or even iterations

Seeking assistance because we are facing a challenge that we cannot seem to overcome. Despite researching on platforms like StackOverflow and search engines, implementing a solution or solving the problem remains elusive. The goal is to develop a JavaScri ...

javascript jquery ajax asynchronous callback

How the Marvel of jQuery Ignites the Power of

I require some assistance with the callbacks. It appears that they are not functioning properly. I am in the process of creating a jQuery-based game. I have designated a <div id='button'></div> for all the buttons that will be used in the gam ...

javascript jquery callback jquery-events

ClickAwayListener's callback function stops executing midway

I am currently utilizing Material-UI's ClickAwayListener in conjunction with react-router for my application. The issue I have come across involves the callback function of the ClickAwayListener being interrupted midway to allow a useEffect to run, only to ...

javascript reactjs callback react-router material-ui

Assessing asynchronous HTTP function with Jamine: Exceeding time limit - No response received within 5000ms

ISSUE: Dealing with asynchronous functions returning Promises that rely on nested HTTP calls. USED TECHNOLOGIES: Angular 9, Jasmine 3.4.0 ERROR ENCOUNTERED: Error: Timeout - Async callback was not invoked within 5000ms (set by jasmine.DEFAULT_TIMEOUT_INT ...

angular promise callback jasmine karma-jasmine

Exploring the capabilities of window opener in AngularJS applications

I am facing an issue with a function that utilizes an API to redirect me to a callback URL. After this redirection, I need to execute a function in my core JavaScript. If I keep the function separate from AngularJS and use window.opener, it works fine. How ...

javascript angularjs callback

Preventing the callback nightmare in nodeJs / Sharing variables with nested functions

Let's simplify this scenario: const generateUrl = (req, res) => { const id = req.query.someParameter; const query = MyMongooseModel.findOne({'id': id}); query.exec((err, mongooseModel) => { if(err) { //handle error ...

javascript node.js express callback mongoose

What are the steps to develop a personalized callback in Keras?

I want to enhance my keras model by incorporating a callback feature. Specifically, I am looking to get updates on val_acc through a telegram bot message after each epoch. While I understand the concept of adding a callback_list as a parameter in classifie ...

python tensorflow keras neural-network callback

Using JQuery to send a post request to an iframe and receiving a

Currently, I am utilizing a form on a webpage to send data to an iFrame. This process can occur multiple times based on user requests. You can see an example of this process here: Target an iframe with a HTML Post with jQuery My goal is to implement speci ...

jquery html iframe callback

Rendering a Vue select list before receiving data from a Meteor callback

I am currently facing an issue with populating my events array from a meteor call so that it appears in a select list. The 'get.upcoming' Meteor function returns an array of JSON objects, but it seems like the select list is being rendered before ...

javascript meteor callback vue.js vuejs2

Utilizing jQuery to Trigger a JavaScript Function in a Separate File

Here is my question: I currently have 2 files: //File1.js function TaskA() { //do something here } //File2.js function TaskB() { //do something here } $(function() { TaskA(); }); The issue I am facing is that the TaskB function in File2.js ...

javascript jquery ajax function callback

Trigger a function when the browser automatically populates an input field

I am attempting to trigger a function that can detect if the browser has autofilled a field and then add a specific class to it. After finding a thread with a solution that mostly works, mentioned here: Here is how I implemented it: $.fn.allchange = fun ...

javascript jquery html autocomplete callback

The sequence of the exported promise chain in node.js is not executing in a sequential manner when combined

I am currently working with 2 files. The first file, get_data.js, is responsible for retrieving data from an API by acquiring an access token, using that token to access the URL containing the desired data, and then converting the CSV data obtained into JS ...

node.js http promise callback node-modules

What is the most effective method for nesting loops in NodeJS and Mocha?

Currently, I am attempting to create a loop within a loop in my NodeJS code, but I seem to be getting lost along the way. The results are not as expected - sometimes callbacks are triggered twice and so on. My approach involves using the async module. I wo ...

javascript node.js asynchronous callback mocha.js

Building a Facebook application using NODE, EXPRESS, and PASSPORT with a designated Callback URL

I'm currently working on a Facebook app and I want to enable users to log in to my website using their Facebook accounts. I've integrated the code, but Facebook is unable to find the callback page/URL. URL: {here_goes_the_callback_code} Error: The webpage ...

node.js facebook express callback

What is the correct way to invoke a function from a different file?

Having trouble calling a function from another file in my JS code. I am unable to call a function from another js file. I suspect there is an issue with linking the two files. Code snippet from my first JS file const { response } = require('expre ...

javascript node.js mongodb callback express-generator

What is the best way to access a variable from a different function in JavaScript?

In my current project, I have implemented a function that fetches a JSON string from an external URL. The JSON data is being retrieved successfully and is functioning as expected. However, I am facing an issue with the variable 'procode'. I need to access ...

javascript jquery json callback

Tips for retrieving a function value with MongoDB's collection.find() function

Whenever I execute collection.find() in MongoDB with Node and Express, I find myself struggling to retrieve values for my array due to being stuck in callback hell; foursquare.getVenues(params,function(error, venues) { if (!error) { var places ...

node.js mongodb express callback

Error receiving parameter in express route callback function

At the moment, I have been working with a number of routes in Express. Some routes are quite lengthy and tend to look like this: router.get('/api/comments', function(req, res, next){ Comment.find({"user": req.payload._id}).exec(function(err,comments){ ...

javascript node.js express callback routes

Is it advisable to send an object as an argument in a function?

Here's the code snippet I'm working with: const failure1 = false; const failure2 = false; function callbackFunction(callback, errorCallback) { if (failure1) { errorCallback({ name: 'Negative event1 occurred', message: ' ...

javascript function callback

Attaching a callback function to a directive using a template tag in Angular

I am having trouble binding a callback to a component using a template. The template includes an instance of another directive, but for some reason it is not working as expected. I am calling the directive from a modal, and I'm not sure if that could be ca ...

angularjs angularjs-directive callback

Annoying jQuery animation error: struggling to animate smoothly and revert back. Callback function conundrum?!

I'm completely lost with what I have accomplished. My goal was to create an animation where an element slides in from a certain position and then slides back when another element is clicked. To achieve this, I included the second event within the callback ...

javascript jquery events animation callback

Error encountered when trying to load Ajax script

As a beginner in the learning process, my code may appear messy. I am currently wrapping up my second project, which is a photo viewer. On the main page, there is a navigation system that loads different sections of the website using ajax. Since this proje ...

javascript jquery html ajax callback

I am facing an issue with the vtkTimerCallback when used together with the QVTKRenderWindowInter

Having an issue with vtk (8.1) and pyqt5 (5.10.1). When using the vtkCallBackTimer with the original vtk.vtkRenderWindowInteractor(), everything works correctly. However, when attempting to use the vtk.qt.QVTKRenderWindowInteractor.QVTKRenderWindowInteract ...

python callback pyqt vtk

Is it necessary to use next() in express routes?

Many instances in Nodejs/Express showcase that calling next() is not always necessary for success. exports.postLogin = (req, res, next) => { passport.authenticate("local", (err, user, info) => { if (err) { return next(err); } re ...

node.js express callback node-async

Retrieving the result of a callback function within a nested function

I'm struggling with a function that needs to return a value. The value is located inside a callback function within the downloadOrders function. The problem I'm encountering is that "go" (logged in the post request) appears before "close" (logged in down ...

javascript node.js asynchronous callback async-await

How can I implement a SWR refresh from a button click in a child component using a callback function?

I am currently working on a shopping cart component in Next.js and facing an issue with refreshing the cart data after making updates. My cart component is a function as per the recommendations in the Next.js documentation (https://nextjs.org/docs/basic-fe ...

reactjs callback next.js

Utilizing Ajax looping to generate dynamic HTML content with Bootstrap tabs

I am looking for a way to fetch multiple JSON files and display the data from each file in separate Bootstrap 3 Tabs. I understand that the getJSON function does not wait for completion before moving on, but I need help with using callbacks in situations ...

javascript ajax twitter-bootstrap callback twitter-bootstrap-3

Tips for managing Express.js callbacks and modifying an object's property from within a function

I am currently working with two JavaScript files. I have successfully retrieved data from MongoDB using the method bookDao.getActiveBookByCategoryId(). The Issue I Am Facing: Within the categoryDao.js file, I am attempting to update the resultJson.book_c ...

javascript node.js mongodb express callback

Javascript promise failing to deliver

As a beginner in the world of JavaScript development, I am excited to be part of the stackoverflow community and have already gained valuable insights from reading various posts. Currently, I am facing an issue where I need to load a file, but due to its ...

javascript json asynchronous callback promise

Converting Callbacks to Promises in Node.js

I am facing a challenge with my node js application as I am attempting to promisify multiple callback functions without success. It has reached a point where I am unsure if it is even feasible. If you can assist me in promisifying the code provided below, ...

javascript node.js callback promise

How can a callback be properly passed in programming?

My coding approach is outlined below: var CustomLibrary = (function (window, $, undefined) { return { URI: 'http://testpage/API/', OnSuccess: function (data, status) { }, OnError: function (request, status, error) { }, ...

javascript jquery callback

Utilizing callback functions within an AJAX request to return a response and trigger further functions within a promise chain

While working on a React project, I encountered three different scenarios regarding making AJAX requests using axios and redux-promise. Can anyone provide some insight into the differences in these cases? Case 1 (the payload is undefined - why?): axios.g ...

ajax callback promise react-redux axios

Bookeo API allows only a maximum of 5 requests to be processed through Node.js

Greetings! I am excited to be posting my first question here, although I apologize in advance if anything appears unclear! My current project involves utilizing Bookeo's API to extract booking data from emails belonging to a tour company and transferring ...

javascript node.js asynchronous callback

Sending a JavaScript function as part of an ajax response

I'm currently working on a system where the user can submit a form through AJAX and receive a callback in response. The process involves the server processing the form data and returning both an error message and a JavaScript function that can perform furt ...

javascript ajax json callback

Failure to Trigger Callback in Android's Asynchronous API for AJAX Queries

I am encountering an issue with the Android Query Async API sample code. The callback function is not getting called as expected. public void asyncJson(){ String url = "http://www.mysite.com/MyService.asmx/GetJson"; Map<String, Obje ...

android ajax callback

The error occurred in async JavaScript parallel code because the task is not recognized as a function

I am attempting to upload an image and update the image URL in the database collection using the code provided below. Controller.prototype.handle = function (req, res, next) { var id = req.params.id, controller = req.params.controller, optio ...

javascript node.js asynchronous express callback

Tips for synchronously waiting for a promise in a Node.js function

Using an asynchronous method, I generate a decrypted file that contains my users' credentials: initUsers(){ // decrypt user file var fs = require('fs'); var unzipper = require('unzipper'); unzipper.Open.file('encrypted.zip') ...

node.js asynchronous callback promise async-await

Insert HTML content into an iframe with a callback function

We are receiving information from the backend server and need to transfer it to an iframe. In order to accurately set the height of the iframe to match the content, we must wait for the content to be loaded into the iframe. However, this process may not ha ...

javascript html iframe callback

Tips for maintaining data in a React component across re-renders?

Currently, I am working on creating a basic axios call to communicate with a nodejs server from a react application in order to retrieve products stored in a mongoose schema model. The issue I am facing is that when the page initially loads, I can successf ...

node.js reactjs callback axios react-component

Every time I restart the server with MEN stack, I encounter an error message stating "Cannot read property 'name' of null"

I am currently working on developing a campgrounds application based on Colt Steele's Udemy course "The Web Developer Bootcamp". Everything is going smoothly except for one issue I encountered. When I restart the server and directly access the URL with an ...

javascript node.js express callback ejs

Vuejs allows objects to trigger the execution of methods through elements

My goal is to utilize a function in order to individually set the content of table cells. In this specific scenario, I aim to enclose the status with the <strong> - Tag (I refrain from modifying the template directly because it is stored within a com ...

javascript function object callback vue.js

unable to retrieve information from the redis cache

Attempting to retrieve data from cache using the readData function in the controller file. Encountering an issue where the someVal variable is initially undefined after calling readData, but eventually gets populated with data after receiving a callback ...

node.js typescript callback es6-promise node-redis

Is it advisable to avoid using try-catch in Node.js?

Currently, I am in the process of developing a data processing system using Node.js. The data that is inputted into the system can be provided by users or sourced from external entities, which means: There is a possibility for the data to be malformed i ...

node.js exception callback try-catch

The Importance and Purpose of Incorporating a Callback

Understanding asynchronous operations and callbacks has been a challenge for me. To improve my familiarity with these concepts, I've been studying code examples that utilize them. However, there's one aspect of this specific code snippet that confuses me ...

javascript node.js asynchronous callback

Is there a way to ensure that my code patiently waits until every iteration within a loop is executed before moving forward?

In my code, I am using a jQuery each function to iterate through a collection of HTML elements. During each iteration, I make use of the get method. My intention is to keep track of the successful get calls and display a count at the end. var numSuccessfu ...

jquery callback each

It appears that the NodeJs Express 4 async function in the model is returning before completion

I'm currently working on organizing my project by splitting the logic into different folders such as routes, views, models, and controllers. Within a model named data (models/datamodel.js), I have implemented two methods to retrieve data for populati ...

javascript node.js express asynchronous callback

What is the best way to have PHP execute numerous calls from an array to a script, ensuring that each function completes before proceeding?

In my script, I have an array of properties that includes a list of properties along with their corresponding .ics locations. When I run the script manually for each element in the array individually, it works perfectly. However, when I attempt to loop thr ...

php loops asynchronous callback

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