Suppose I have an array and I need to apply an asynchronous function to each element of the array.
let arr = [item1, item2, item3]
// My goal is to
await arr.forEach(async (item) => {...})
// This can be achieved by
let asyncFunc = async (item) => {...}
await asyncFunc(item1)
await asyncFunc(item2)
await asyncFunc(item3)
Is there a way to accomplish this task?
Does this look good to you?
for (let item of array) {
await function(item);
}
If you really don't want to create a separate function:
for (let item of array) {
await (async value => {
...
})(item);
}
You can even include it in Array.prototype:
Array.prototype.handleSeries = async function(func) {
for (let item of this) {
await func(item);
}
}
// Example:
await arr.handleSeries(func);
// Or:
await arr.handleSeries(async item => {
...
});
Recently, I have been utilizing a popular library known as async. One of the key features it offers is a function called eachSeries, which allows you to iterate through an array and apply an asynchronous function to each item.
Working with this functionality can lead to a tangle of intricacies. It's crucial to ensure that your async function does not trigger any more asynchronous calls itself. Thankfully, the library provides a handy callback mechanism to assist in managing this scenario.
function asyncFunction(value, callback) {
return (function() {
//perform tasks
callback();
})();
}
By using the provided callback, you can smoothly transition to processing the next item in the array.
This particular function has been a part of my toolkit for quite some time now, especially when I don't feel the need for a separate library:
// Here's how you can use this function:
// array.asyncEach(function(item, resume) {
// do something...
// console.log(item);
// resume(); // call `resume()` to continue the iteration
// }
//
// The loop won't move on to the next item until resume() is invoked
Array.prototype.asyncEach = function(iterator) {
var list = this,
n = list.length,
i = -1,
calls = 0,
looping = false;
var iterate = function() {
calls -= 1;
i += 1;
if (i === n) return;
iterator(list[i], resume);
};
var loop = function() {
if (looping) return;
looping = true;
while (calls > 0) iterate();
looping = false;
};
var resume = function() {
calls += 1;
if (typeof setTimeout === 'undefined') loop();
else setTimeout(iterate, 1);
};
resume();
};Feel free to include any asynchronous operations within the function and make sure to invoke resume() upon completion.
I honestly can't recall where I originally found this snippet of code.
Will these functions only be called during a specific event?
If so, could this behavior be achieved using closure in JavaScript?
At the moment, your function will execute with the last value in the array when it is invoked.
An issue arises with the error message Uncaught TypeError: Cannot read property 'opacity' of undefined identified on three.js:12917 The current scene file in use is as follows: { "metadata": { "version": 4.3, "type": "Object", "gene ...
My task involves processing a list of strings that look like this: Client Potential XSS2Medium Client HTML5 Insecure Storage41Medium Client Potential DOM Open Redirect12Low The goal is to split each string into three parts, like so: ["Client Potential X ...
I am encountering an error in the navigationOptions() function when running my React app, but everything is working correctly in the render() function. App.js import React, { Component } from 'react'; import { AppRegistry, View } from 'r ...
My current issue involves an ajax web application that loads all parts on a single page, specifically index.html. The inner parts being loaded in index.html have exceeded 32 pages (html, js, css). Now I am facing difficulties with the CSS files that need ...
There seems to be an issue with the code below. When I click the button next to the canvas, my intention is to have a new window open displaying the canvas in full view. However, it's not working as expected. Can someone please assist me in troublesho ...
Utilizing Angular and Cloud Firestore for my backend, I have a setup where users can follow or unfollow each other. The issue arises when the button text and list of followers/following do not immediately update on the front end after a successful click ev ...
I've been struggling to make this code work. In my footer file, I have the following: footer.php: <script type="text/javascript"> $(document).ready(function(){ $.ajax({ url: '', type: 'GET', dataType: "script", success: ...
I have a code snippet for the Cards.js file that displays a card which links to the Services page on my website. I now want to add a link to an external website. How can I achieve this? Do I need to include an <a href= link in the Cards.js file? import ...
I am trying to populate a Swiper slider carousel with images from an array of objects. However, when I use map in the fetch to generate the HTML img tag with the image data, it is not behaving as expected. All the images are displaying in the first div a ...
Currently, I am in the process of refactoring a complex and extensive form that primarily operates within a controller. To streamline the process, I have started segregating related functions into separate modules or services. However, I am grappling with ...
I successfully created an AJAX function, but I am facing an issue with retrieving the variable using PHP. Below is my code: // Validate signup function validateSignup(){ // Get values var username = document.getElementById("pm_username").value; ...
When creating a service and calling it from the required functional component, there are two different approaches you can take. 1. export const userProfileService = { ResetPassword: async (userId: string) => { var response = await http.get ...
As a newcomer to JavaScript, I am eager to tackle the challenge presented below: Situation: In possession of a JSON file containing personal details such as name, email address, bio, etc., my task is to design a basic web page showcasing this data for ea ...
TEST AREA I've put together a basic demo of jquery-ui autocomplete. QUERY How do I trigger a postback when a selection is made from the autocomplete list? HTML <select id="ddl"></select> <input id="field" type="text"></input& ...
Looking to safeguard the inputs provided to a nodejs server with the assistance of the google-caja sanitizer. However, it's somewhat overzealous and cleanses away the > and < symbols too. My project requires me to retain html characters in the ...
Trying to eliminate an element from an array using the Splice method. arrayFinalChartData =[{"id":"rootDiv","Project":"My Project","parentid":"origin"},{"1":"2","id":"e21c586d-654f-4308-8636-103e19c4d0bb","parentid":"rootDiv"},{"3":"4","id":"deca843f-9a72 ...
Currently, I am developing a feature for a Chrome extension and I could use some assistance in debugging. The feature involves retrieving a user's input as a string from a text box on popup.html and then scanning through all the open tabs in the curr ...
I am having trouble with sending a REQUEST to a server in order to retrieve a message. I have tried using the jQuery method $.get(), and it seems to have successfully reached the server. However, I am facing an issue where I am unable to send a RESPONSE b ...
As a newcomer to frontend development, I have a basic understanding of HTML5, CSS, and Javascript. Recently, I started working on a vue.js project where I integrated bootstrap and axios. Everything seemed to be working fine until I encountered an issue whe ...
I understand that vuetify's grid system is based on a 12-column flex-box layout, but I would like to customize it to have 7 or 8 columns by default instead of the usual 12. In the code snippet below, you can see my attempt: <v-row> <v-col ...