Questions tagged [javascript]
For questions regarding programming in ECMAScript (JavaScript/JS) and its various dialects/implementations (excluding ActionScript). Please include all relevant tags on your question; e.g., [node.js], [jquery], [json], [reactjs], [angular], [ember.js], [vue.js], [typescript], [svelte], etc.
2,301,614
questions
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4 views
Socket.io check if url contains http:// or https:// and make it clickable
I have been working on a chat application where users can enter a room and message each other. Everything is working fine, but I’ve noticed that when sending a message containing HTTP:// & HTTP:// ...
-1
votes
0answers
6 views
How nodejs handle really fast events
I have a nodejs process with 4 different websockets, each pushing thousand events each second.
For each event I'm calling an async function which elaborate it.
Does nodejs execute this function in ...
0
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0answers
14 views
How do I stack the images above the text?
I am trying to figure out how do I stack each of the images above the text? The way it is currently it is it produces each image on the same line as the associated text so I am trying to do the ...
0
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0answers
9 views
I would like to copy a section of pixels of a photo with JavaScript, and then divide into parts, how to do this to achieve bubble/magnify effect?
<img height="500" width="500">
<script>
imgDimension = document.getElemetsByTagName('img')[0].?
imgSection = ?.[?];
imageSection.imgSection = function ?(){}
...
0
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0answers
3 views
Print out datafield in a md file onto one line
Wondering if anyone can help me out in figuring a way to print out in one text box the results from a script I made to pull data from other text boxes. So far it's all worked out but on the last stage ...
1
vote
1answer
8 views
Error when multiplying input value in a variable
I have 2 lists (conversion from kilometers to miles etc.). When I'm trying to use input value to calculate (so "X * 1.609" for kilometers to miles) I have an error NaN.
const inputPlace =...
0
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0answers
7 views
Regex 5 alphanumeric separated by dash
I want to create a RegExp validation in javascript for string which can have 5 parts of alphanumeric seperated by only 4 dash.
ed87aceb-cc6f-4535-be4e-867ac15310ab
Invalid entries are
More than or ...
0
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0answers
3 views
collapse and expanding two Bootstrap menu opposite situation
I'm workin' on a website that has two different menus and both use Bootstrap. they have to work opposite of each other, I wanna write the code when clicking on one of the menus to expand, the other ...
1
vote
1answer
17 views
How to fix an invalid random string to make it JSON valid
In Javascript, I need to "fix" a string, supposed to be JSON valid but may not be. The string has the following format (the unknown part is marked with "<INVALID_CHARS>"):
[
...
-2
votes
0answers
8 views
Dynamic table using javascript?
add new button doesn't work if any existing row is deleted before adding
delete button doesn't work for newly added rows
checkbox on the top should select/remove all rows
age column is an integer, ...
0
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0answers
7 views
Webpack 5 not bundling CSS url() asset modules
I'm trying to include a new font face in my React application. This is built using Webpack.
I've followed the webpack documentation of font bundling, https://webpack.js.org/guides/asset-management/#...
0
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0answers
6 views
How can I retransmit a video?
Say there is website X which hosts a video on it's page. How could I possibly retransmit that video onto another player on another website?
Phrased differently - how can I capture the original video ...
0
votes
0answers
8 views
Node JS: Error: read ECONNRESET at TCP.onStreamRead (node:internal/stream_base_commons:211:20)
I'm trying to insert a big array of data in MySQL database with node.js.
My code works correctly with small array about 300 elements, but when I insert an array with 1M elements I have the following ...
1
vote
0answers
8 views
Add (one below the other) and remove drop down lists (select element) inside javascript function
I have this javascript code. It is a group of drop down lists and two buttons (Add button and Remove button).
This image is the initial display.
When I click the "Add Item" button, I want ...
0
votes
1answer
5 views
getting duration of mp3 without javascript library or nodejs
I have an audio element in my html to which im feeding an mp3 file for every item in an array, that works fine. What i want to happen is that it loads its metadata and reads its duration, then ...
0
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0answers
9 views
How to load and get images in JS dynamically
I'm working on a small canvas game engine and rewriting a part of it that loads images.
export default class Loader {
images = {};
async init() {
await this.loadImage("grid&...
0
votes
0answers
19 views
How do I convert a dropdown <Dropdown> to a list instead?
Currently, I have a dropdown menu that looks like the image below. It is using the <Dropdown> which is being imported. However, when I change the <Dropdown> to <ul> instead I am ...
-1
votes
0answers
20 views
anyone k now why i'm getting this error. uncaught TypeError?
I cant find the error on my code but I am getting an uncaught TypeError message everytime I run it. It says uncaught typeError: cannot read properties of undefined reading 'readyState' at ...
-1
votes
1answer
14 views
Hey I am trying to get 12.0 as answer but getting 12 how can i turn this number into a float,
As you can see I am trying to getting 12.0. But instead i am getting 12 how can i add a 0 and make this number to a float please help
*JavaScript
let a = 6.0;
let b = 6.0;
console.log(a);
-2
votes
0answers
13 views
Uncaught SyntaxError: Identifier 'Products' has already been declared
I want to make a Class that will fetch my products and stringify them but console says that Products is already defined. Can you help me? Thanks a lot. That's my code:
//cart
var cart = [];
// ...
0
votes
0answers
7 views
Detect whether Japanese IME is active in input box in Javascript
Is there a way to detect whether a Japanese (or other language) input method editor is active when a user is typing into an input box in Javascript? I have an input box which responds to the enter key ...
0
votes
1answer
12 views
How to execute code after all rows of array has been read using Readline module
I am trying to input an array of strings to my program using readline module.
an example:
const readline = require('readline');
const r = readline.createInterface({
input: process.stdin,
output: ...
0
votes
0answers
8 views
JS Regex - String with at least 6 characters, one digit and one number. No whitespaces, no special characters, and only letters and digits [duplicate]
I need a Regex expression for words with
at least 6 characters
only letters and digits
at least one digit
at least one letter
I have been testing this one
/^((?=.*\d)(?=.*[a-zA-Z]))\w{6,}$/
but ...
1
vote
0answers
15 views
JavaScript apply() and invocation context [duplicate]
I am currently learning JavaScript and I thought that I understood functions. Apparently not. I thought that, in the following code, first argument of apply() call, which is this, would evaluate to ...
-1
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0answers
12 views
Good afternoon, is there any way to receive information through bluetooth and send it to the backend? I use React-Native
Good afternoon,
is there any way to receive information through bluetooth and send it to the backend? I use React-Native
0
votes
0answers
8 views
Electron/Node: How to know when a file is modified by an external application?
I'm building an application that allows editing text files using Electron and Typescript.
The application has two main requirements:
Supports AutoSave
When an external app modifies the text file, the ...
0
votes
0answers
6 views
Electron - save canvas img to file on disk
I'm trying to create a GIF/PNG generator which would combine images from different arrays and create a new array that would be converted into zip file with PNG/GIF images.
I currently hit the wall ...
0
votes
2answers
18 views
How create React Typescript component with required and optional values but required value without default value?
I have a lazy load component where I have 3 parameters:
children: is a component to pass to the Suspense component.
height: is the height for the LazyLoad component load icon.
width: is the width for ...
-2
votes
0answers
8 views
Reactive programming in Frontend development RxJS advantages [closed]
I started learning about reactive programming, I have learned the paradigm and have gotten familiar with RxJS. I created a simple search engine bar using RxJS and vanilla JS with lodash in order to ...
0
votes
0answers
5 views
How to insert iframe with p tag inside Quill editor?
I'm using BlockEmbed from
var BlockEmbed = Quill.import('blots/block/embed');
And my Image insertion code looks like this
class Youtube extends BlockEmbed {
static create(value) {
var node = ...
0
votes
1answer
11 views
React component which returns a table throws error because of useMemo hook
I'm trying to build an app that has a main component which imports a tab component which based on the selected tab, loads a component or the other one.
The problem appears because in that component, ...
0
votes
0answers
6 views
how to get javascript variables into django url
<a href="{% url 'main:projectdata' proname=pro.projectname n=state %}"></a>
<script>
var state = 'Done';
</script>
how to pass javascript variable state into ...
2
votes
1answer
14 views
Implementing private video chat rooms onto a website
I want to implement a private video chat room software onto my website. Like Google Meet without the bells and whistles (just video calling with a shareable private link).
I found an open source ...
0
votes
2answers
37 views
Trying to reverse order of four verses in javascript
I´m trying to write the necessary statements to print the four verses of the Programmer's Lament but in reverse order. I´m trying to learn more about code and doing some exercises, the verses are ones ...
0
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0answers
7 views
how to implement resumable large file upload in javascript and laravel
I am trying to implement large file upload with resumable.js and laravel-chunk-upload. Everything is working fine, that is I am able to upload large files properly but the problem is, if anything ...
0
votes
0answers
5 views
Problem spying on a typeorm rollbackTransaction() function with jest
I'm trying to spy on a function so I can check if it's being called inside a try/catch, but I can't do that check. I believe the problem is in the spy assembly, as it can connect to the database, ...
1
vote
1answer
12 views
Appending text to results of HTML form action search, one text box, 2 buttons, 2 possible results,
I used @John Strood's answer from here to build my current script. The below code is close to my need, I now just need to append text to the results.
For example, appending site:imdb.com/title ...
0
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0answers
9 views
How to change the font size of the bullets of an unordered list item in draftjs?
I have a rich text editor built using draftjs. I implemented the functions for changing the font size, font family, and color of the text in the editor. I also implemented the functionality of adding ...
0
votes
1answer
18 views
How to run the same JQuery on a new page
I was wondering, is it ever possible to run a JQuery code on the next page (lets say Page 2) that is executed on another page before (lets say Page 1)?
So lets say this block was executed on Page 1
...
0
votes
1answer
28 views
How to pack a thing [e.g. array, object] in Javascript like in C++?
I would like to know how (and if this is possible) to pack arrays in JavaScript like in C++, because I would like to micro-optimise my code by packing an array. In C++ it looks like this:
#pragma ...
-1
votes
0answers
8 views
Apollo/GraphQL error " Invariant Violation: Could not find "client" in the context or passed in as an option.."
I have a React/TypeScript GraphQL/Apollo app that connects with an API and retreives a list of products and displays them on the page. The app starts and works fine. However, when I run a test (Jest + ...
0
votes
0answers
6 views
FullWidthControl Google Maps
I'm building a map in React with GoogleMap Api and now I want to cutom my fullWidthControl.
there is function that can I call instead the conrol?
(Like the setZoom..)
there is way to design the ...
0
votes
0answers
15 views
event listener in js is not working in phone?
EventListener not working in mobile. this script is working properly in PC but it's not working in mobile phone I have try onclick too then or other function but don't know why none of them working in ...
0
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1answer
26 views
Stop audio on click and play it again
I am using 2 custom buttons and using JavaScript to click the audio play and pause.
I am using the below code for that:
<img class="head-iconn" src="img/audio.png" onClick="...
0
votes
1answer
12 views
How do I extract a portion of a link passed as a parameter in javascript? [duplicate]
I have a link similar to https://app.ticketmaster.com/discovery/v2/events?apikey=xxxxxx&keyword=Sarah%20Jarosz&latlong=xx.xxxxx,-xxx.xxxx&radius=15&unit=miles&locale=* that is ...
0
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0answers
16 views
I want to change the array by receiving the values in real time
I used event bus to pass values in real time.
However, although the selectPosts method operates asynchronously, I have heard that it is not always good to adjust the variable value using the event bus ...
0
votes
0answers
19 views
Detecting partial keyboard runs in RegEx
I am looking to capture partial keyboard runs in strings (in Javascript); specifically the length of the run when three or more characters.
While I can do this if I know the starting letter – for ...
0
votes
0answers
8 views
Can I use anime.js in EJS files with Node?
Every time I try to pass the animation variable to the EJS file in app.js I am met with the following error:
ReferenceError: NodeList is not defined
at toArray (C:\Users\18317\Documents\Web ...
1
vote
2answers
32 views
My clone is cloning all the previous added items
So i have an MVC app, i want to clone the div with the tag class="item_details" but my problem is that when i clone 1 time everything is good, then i clone a second time but it will clone ...
0
votes
1answer
15 views
Nestjs Roles Decorator: Crazy behaviour with getting user out of payload data
I am just trying to implement my Roles Decorator in Nestjs. So far it went pretty well, until I wanted to compare the user of the payload data from the jwt-token to the required role. I can't explain ...
