Category: javascript

I am trying to research how a webpage is working. There is an a element with no href:

<a class="shared_profile_name" data-automations="SharedMatchProfileName">Marie Lis</a>

When I click on this link I am navigated to another web page actually. This element has click event but it references to an empty function (file VM2802 reactDomLibrary.min_v7effa9d01eba88a013b14d6c4c01b23c.js, obfuscated):

function Jr() {}

I want to understand how web page dynamically builds the url to navigate? Most of all I want to know the id of the item users clicks on.

Actually this is https://www.myheritage.com.ua/ page and the link is when I have a list of shared DNA matches with one of my DNA match I click on the name of such match.

Im using this script for Mousewheel. What i have tried only works one way …instead of scroll up and down it just Scrolls forward. What i want it to do is change the cursor Forwards and Backwards. Here is what i have tried.

    body {
        background-color: #ffffff;
        overflow: hidden;
    }

    html,
    body {
        height: 100%;
    }

    .box {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
    }

<div class="box"></div>
    var clicked = 0;
    window.addEventListener('wheel', function (event) {
        if (clicked == 0) {
            document.getElementsByTagName("body")[0].style.cursor = "url('https://tim-school.com/codepen/mouser/1.png'), auto";
            clicked = 1;
        }
        else if (clicked == 1) {
            document.getElementsByTagName("body")[0].style.cursor = "url('https://tim-school.com/codepen/mouser/2.png'), auto";
            clicked = 2;
        }
        else if (clicked == 2) {
            document.getElementsByTagName("body")[0].style.cursor = "url('https://tim-school.com/codepen/mouser/3.png'), auto";
            clicked = 3;
        }
        else if (clicked == 3) {
            document.getElementsByTagName("body")[0].style.cursor = "url('https://tim-school.com/codepen/mouser/4.png'), auto";
            clicked = 4;
        }
        else if (clicked == 4) {
            document.getElementsByTagName("body")[0].style.cursor = "url('https://tim-school.com/codepen/mouser/5.png'), auto";
            clicked = 5;
        }
        else if (clicked == 5) {
            document.getElementsByTagName("body")[0].style.cursor = "url('https://tim-school.com/codepen/mouser/6.png'), auto";
            clicked = 0;
        }
    });

I’ve also tried the DeltaY method, But could not figure it out.

so I’m trying to build an extension manager page and I solved an issue where when I try to activate/deactivate one of the extension it works when I flip the switch right after the page loads, however once one of the filter buttons is clicked, the toggle stops working

const cards = document.querySelector(".cards");
const all = document.getElementById("all");
const inactive = document.getElementById("inactive");
const active = document.getElementById("active");
const modeToggle = document.getElementById("mode-toggle");

let extensions = [];
let activated = [];
let inactivated = [];

fetch("./data.json")
    .then(response => response.json())
    .then(data => {
        extensions = data;
        showData(extensions);
        console.log(extensions);
    })
    .catch(error => {
        console.log("Error fetching data");
    });

class Extension {
    display(dataArr) {
        cards.innerHTML = `
            ${dataArr.map(extension => `
            <div class="card extension-card">
                <div class="ext-info">
                    <img src="${extension.logo}" alt="Extension logo" width="60">
                    <div class="text">
                        <h3 class="extension-title">${extension.name}</h3>
                        <p class="extension-description">${extension.description}</p>
                    </div>
                </div>
                <div class="functions">
                    <button class="btn btn-outline-secondary remove" id="remove">Remove</button>
                    <label class="switch">
                        <input type="checkbox" class="activate" data-id="${extension.id}">
                        <span class="slider"></span>
                    </label>
                </div>
            </div>
            `).join("")}
        `;
    }

    setCheckboxState(dataArr) {
        const activateToggles = document.getElementsByClassName("activate");

        dataArr.forEach(extension => {
            [...activateToggles].forEach(toggle => {
                if (toggle.getAttribute("data-id") === extension.id) {
                    toggle.checked = extension.isActive;
                }
            });
        });
    }

    static updateArrays() {
        activated = extensions.filter(ext => ext.isActive);
        inactivated = extensions.filter(ext => !ext.isActive);
    }
}

const showData = (dataArr) => {
    dataArr.forEach((extensionData) => {
        const extension = new Extension();
        extension.display(dataArr);
        extension.setCheckboxState(dataArr);

        const activateToggles = document.getElementsByClassName("activate");
        [...activateToggles].forEach(toggle => {
            const extensionId = toggle.getAttribute("data-id");
            const extension = extensions.find(ext => ext.id === extensionId);

            toggle.addEventListener("change", () => {
                extension.isActive = toggle.checked;
                Extension.updateArrays(); // Update arrays after each toggle
            });
        });

        // Event listeners for filtering
        all.addEventListener("click", () => {
            cards.innerHTML = "";
            extension.display(extensions);
            extension.setCheckboxState(extensions);
        });

        active.addEventListener("click", () => {
            cards.innerHTML = "";
            Extension.updateArrays(); // Update arrays before filtering
            extension.display(activated);
            extension.setCheckboxState(activated);
        });

        inactive.addEventListener("click", () => {
            cards.innerHTML = "";
            Extension.updateArrays(); // Update arrays before filtering
            extension.display(inactivated);
            extension.setCheckboxState(inactivated);
        });
    });
};

does anyone have an idea of how to solve this issue?

`import EventForm from ‘@/components/shared/EventForm’
import { auth } from ‘@clerk/nextjs/server’
import React from ‘react’

const CreateEvent = () => {
const {sessionClaims} = auth();
return (
<>

Create Event

</>
)
}

export default CreateEvent`

I tried to add new event and use the client session id but the clerk its return error when I import the auth from @clerk/next

I recently tried implementing Partytown to offload Google Tag Manager (GTM) to a web worker. GTM itself loads successfully via Partytown. However, the tags managed by GTM — specifically Google Analytics and Facebook Pixel — are throwing CORS errors when they attempt to fire network requests.

I am using Next 12 with React 17 ( Node v18 ) and installed Partytown using npm install @builder.io/partytown. Loaded the GTM script using . GTM loads successfully via the worker, however, tags inside GTM (like Google Analytics and Facebook Pixel) throw CORS errors when they try to send network requests.

Is additional configuration required to allow scripts loaded inside GTM (like GA, Facebook Pixel) to work with Partytown? How can I fix or work around the CORS issues triggered by these third-party tags?

I am working with the Mistral AI API to return a stream to the frontend but the frontend keeps repeating itself so instead of just streaming the whole text on screen it just starts again when it’s done. I’m using Nuxt 3.

Backend code

import { Mistral } from '@mistralai/mistralai';
import { getQuery } from 'h3';

export default defineEventHandler(async (e) => {
    const { songs } = getQuery(e);
    const config = useRuntimeConfig();

    const messages = [{ 
        role: 'system', 
        content: `
        You are a helpful creative psychiatrist who determines peoples personalities by looking at the songs they listen to. Besides that, 
        give an in-depth analasys of who I might prefer as a romantic partner and why. Mention a few songs on which you based the analysis.
        Respond in markdown and do not ask if you can assist any further.
        `
    },{ 
        role: 'user', 
        content: `${songs}`
    }];

    try {
        const mistral = new Mistral({ apiKey: config.mistralAiApiKey });

        const stream = await mistral.chat.stream({
            model: 'mistral-small-latest',
            messages
        });

        setHeader(e, 'Content-Type', 'text/event-stream');
        setHeader(e, 'Cache-Control', 'no-cache');
        setHeader(e, 'Connection', 'keep-alive');

        for await (const chunk of stream) {
            e.node.res.write(`data: ${chunk.data.choices[0].delta.content}nn`);
        }

        e.node.res.end();
    } 
    catch (error) {
        console.error(error);
            
        throw createError({
            statusCode: 500,
            message: error
        });
    }
});

Frontend code

const eventSource = new EventSource(`/api/mistral/analysis?songs=${songs}`);

eventSource.onmessage = (event) => {
    console.log(event.data);
    bio.value += event.data;
};

Does anyone know how I can fix this error? It’s making my site run slowly!

https://primavera-agentur.at/

image-psd.jpg

image-psd-1.jpg

I’m trying to create a bot that monitors the stock of specific products. I wanted to avoid puppets to make it as efficient as possible. I found different documentation on Amazon’s public APIs online but I noticed that they have request limits. I would like to monitor the products continuously once a second. By analyzing the site, I realized that there is an ajax API with which I can retrieve the info but only for products with variants. Can anyone give me better direction on what is best to do?

I have to make a form, validate it and if everything is OK, submit it (it doesn’t have to go to a server). If not, the form is not sent and it indicates the errors. The form has both mandatory and optional inupts, and I was following a tutorial that used the function e.Preventdefault() but that’s because the person doing it had all of his inputs mandatory so I don’t know how to solve it

The code for the form (without CSS styles to make it short) is this

    <html>
        <body>
        <div class="formulario">
            <form id="formulario" name="formulario" action="mailto:[email protected]">
                <fieldset>
                    <legend>Formulario de registro</legend>
                    <p>Los campos marcados con asterisco(*) son obligatorios</p>
                        <h1>Nombre y apellidos</h1>
                            <label for="nombre">Nombre*</label><br>
                                <input type="text" id="nombre" name="nombre"><br>
                            <label for="apellido1">Primer apellido*</label><br>
                                <input type="text" id="apellido1" name="apellido1"><br>
                            <label for="apellido2">Segundo apellido</label><br>
                                <input type="text" id="apellido2" name="apellido2"><br>
                        <h1>Número de teléfono</h1>
                            <label for="movil">Teléfono movi*</label><br>
                                <input type="text" id="movil" name="movil"><br>
                            <label for="fijo">Teléfono fijo</label><br>
                                <input type="text" id="fijo" name="fijo"><br>
                        <h1>DNI</h1>
                            <label for="dni">Número de DNI*</label><br>
                                <input type="text" id="dni" name="dni"><br>
                        <h1>Fecha de nacimiento</h1>
                            <label for="cumple">Fecha de nacimiento</label><br>
                                <input type="date" id="cumple" name="cumple">
                    <div class="botones2">
                        <input type="checkbox" name="terminoss" id="terminoss">Acepto los términos y blah, blah, blah<br>
                        <input type="checkbox" name="spam" id="spam">Quiero que me llenéis el correo de spam<br>
                    </div>
                    <div class="botones">
                        <input type="button" value="Reset" onclick="reset()">
                            <script>
                                function reset() {
                                    document.getElementById("formulario").reset()}
                            </script>
                        <input type="submit" value="Enviar">
                    </div>
                    <p class="advertencia" id="advertencia"></p>
                </fieldset>
            </form>
        </div>
    <script src="validform.js"></script>
    </body>
    </html>

the code for the Js file is this

const nombre = document.getElementById("nombre")
const apellido1 = document.getElementById("apellido1")
const movil = document.getElementById("movil")
const form = document.getElementById("formulario")
const parrafo = document.getElementById("advertencia")
let regexMovil = /^[6789]d{8}$/
let advertencia = ""
let entrar = false

form.addEventListener("submit", e=>{

    if(nombre.value == ""){
        advertencia += "Introduce tu nombre<br>" 
        entrar = true}

    if (apellido1.value == ""){
        advertencia += "Introduce el primer apellido<br>"
        entrar = true}

    if (!regexMovil.test(movil.value)){
        advertencia += "Introduce un móvil válido<br>"
        entrar = true}

    if (entrar = true){
        parrafo.innerHTML = advertencia} else {

        }
})

(the e.=> was for the prevent default function)

So what I need to solve is: how to try to open it in another app when I press submit ONLY if everything is okay, and how to delete the warnings when I press reset and not only the text in the inputs

In trying to reproduce errors from a larger project I have created a server using python’s aiohttp and the following python-socketio (v5.12.0) namespace:

class MyNamespace(AsyncNamespace):

    clients = []

    async def on_connect(self, sid, _environ, auth):
        print(f"{sid} has connected")
        self.clients.append(sid)

    async def on_disconnect(self, sid, reason):
        print(f"{sid} has disconnected ({reason})")
        try:
            self.clients.remove(sid)
        except ValueError:
            pass

    async def on_poll(self, sid, _data):
        """Return random number"""
        rand = random.randint(0, 9)
        await self.emit("result", {"data": rand}, to=sid)

The client is running the following JS, making use of https://cdn.socket.io/4.5.0/socket.io.min.js :

const sio = io("/", {});

setInterval(function() {
    console.log("polling server...")
    sio.emit("poll", {});
}, 5000);

sio.on("result", (data) => {
    console.log(data);
});

This works, at least initially, as this is what we see in the browser console:

[09:13:49] connected!
[09:13:54] polling server...
[09:13:54] got 7
[09:13:59] polling server...
[09:13:59] got 2
[09:14:04] polling server...
[09:14:04] got 0
[09:14:09] polling server...
[09:14:14] polling server...   # Something's gone wrong!
[09:14:19] polling server...
[09:14:24] polling server...
[09:14:29] polling server...
[09:14:29] connected!          # Did we disconnect?
[09:14:29] got 6               # We're back?
[09:14:34] polling server...
[09:14:34] got 0
...

Given the precise 30 second delay after which it failed, a quick google suggested that the problem was version (in)compatability, but this table clearly indicates that my versions are compatible.

On instruction from further googling, I added some more logging to the server side code. The following is the contnet of the server logs over more or less the same time interval:

Apr 27 09:13:46 raspberrypi start-server[250784]: Server running...
Apr 27 09:13:50 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Sending packet OPEN data {'sid': 'YQoJ9GLsXolsywhqAAAA', 'upgrades': ['websocket'], 'pingTimeout': 20000, 'pingInterval': 25000, 'maxPayload': 1000000}
Apr 27 09:13:51 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Received packet MESSAGE data 0/,
Apr 27 09:13:51 raspberrypi start-server[250784]: VVvlt4tqCS-5BMuqAAAB has connected
Apr 27 09:13:51 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Sending packet MESSAGE data 0/,{"sid":"VVvlt4tqCS-5BMuqAAAB"}
Apr 27 09:13:51 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Received request to upgrade to websocket
Apr 27 09:13:51 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Upgrade to websocket successful
Apr 27 09:13:56 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Received packet MESSAGE data 2/,["poll",{}]
Apr 27 09:13:56 raspberrypi start-server[250784]: received event "poll" from VVvlt4tqCS-5BMuqAAAB [/]
Apr 27 09:13:56 raspberrypi start-server[250784]: Sending 7 to VVvlt4tqCS-5BMuqAAAB
Apr 27 09:13:56 raspberrypi start-server[250784]: emitting event "result" to VVvlt4tqCS-5BMuqAAAB [/]
Apr 27 09:13:56 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Sending packet MESSAGE data 2/,["result",{"value":7}]
Apr 27 09:14:00 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Received packet MESSAGE data 2/,["poll",{}]
Apr 27 09:14:00 raspberrypi start-server[250784]: received event "poll" from VVvlt4tqCS-5BMuqAAAB [/]
Apr 27 09:14:00 raspberrypi start-server[250784]: Sending 2 to VVvlt4tqCS-5BMuqAAAB
Apr 27 09:14:00 raspberrypi start-server[250784]: emitting event "result" to VVvlt4tqCS-5BMuqAAAB [/]
Apr 27 09:14:00 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Sending packet MESSAGE data 2/,["result",{"value":2}]
Apr 27 09:14:05 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Received packet MESSAGE data 2/,["poll",{}]
Apr 27 09:14:05 raspberrypi start-server[250784]: received event "poll" from VVvlt4tqCS-5BMuqAAAB [/]
Apr 27 09:14:05 raspberrypi start-server[250784]: Sending 0 to VVvlt4tqCS-5BMuqAAAB
Apr 27 09:14:05 raspberrypi start-server[250784]: emitting event "result" to VVvlt4tqCS-5BMuqAAAB [/]
Apr 27 09:14:05 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Sending packet MESSAGE data 2/,["result",{"value":0}]
Apr 27 09:14:15 raspberrypi start-server[250784]: YQoJ9GLsXolsywhqAAAA: Sending packet PING data None
Apr 27 09:14:30 raspberrypi start-server[250784]: 7aB5pFuYnarQTTCRAAAC: Sending packet OPEN data {'sid': '7aB5pFuYnarQTTCRAAAC', 'upgrades': ['websocket'], 'pingTimeout': 20000, 'pingInterval': 25000, 'maxPayload': 1000000}

So it seemingly sends the expected ping packet after the pingInterval of 25s, but presumably the client died, then it reconnects after the pingTimeout – but I’m not sure why this is 15s after the last ping.

In researching this error, I’ve heard other saying that browsers can close connections on inactive tabs. But in this case the tab clearly isn’t inactive – it’s polling every 5 seconds! Nor was it minimised in this testing.

I’m at a loss of why this is failing. I can’t see any record that the client recieves the ping packet.

The socket.io troubleshooting guide suggests that one possible problem is “A proxy in front of your servers does not accept the WebSocket connection”, and I am proxying through Cloudflare… but it clearly works initially, so I don’t think that’s the issue. The guide also makes it clear that “disconnections are common and expected”. So, if that is the case, should I redesign this code to work under this assumption? If I have const sio = io(...) within the polling loop, it seems to work indefinitely, which is fine for this client, but I want other clients to be listening for result events too, and it’s not clear how I can just maintain a connection like that.

Users fill out a form where they enter what date and time an issue started and when it entered and the form will provide the difference between those times in minutes.

So for example if they enter 4/26/2025 10:00 AM for the start time and 4/26/2025 11:00 AM for the end time, the result of the difference between the two times in minutes would be 60.

This is what I have for the fields the users fill out

HTML

<input type="datetime-local" class="datetime" id="StartDateTime" max="2099-12-31T23:59">
<input type="datetime-local" class="datetime" id="EndDateTime" max="2099-12-31T23:59">

This is what I have for my JavaScript:

function calculateMinutesBetweenDates(date1, date2) {
const timeDifferenceMs = Math.abs(date2.getTime() - date1.getTime());
const minutesDifference = Math.floor(timeDifferenceMs / (1000 * 60));
return minutesDifference;
}
  
const dateString1 = document.getElementById("StartDateTime").value;
const dateString2 = document.getElementById("EndDateTime").value;
  
const date1 = new Date(dateString1);
const date2 = new Date(dateString2);
  
const minutes = calculateMinutesBetweenDates(date1, date2);
console.log(`Minutes between dates: ${minutes}`); // Output: Minutes between dates

However the only result I get is NaN instead of 60 as in the example. It’s not giving any other JavaScript errors so not sure why it won’t calculate the values as the user sets the date and time fields.

If I set the values directly such as:

const startTime = "2025-04-26T10:00:00";
const endTime = "2025-04-26T11:30:00";

Then it works correctly but need the values to change by user input of the HTML fields.

Basically what title says. I want to know if there is any package or other way to declare a context to get data from it (I don´t need to modify that data) without having to declare a provider, a type for the context and the context itself in React.

I am thinking of something like this:

export const CarAdWrapper = () => {

   // Pretend this retrieve a second hand car for sale
   const car = getCarForSale();

   // Pretend this retrieve a user from the second car website
    const user = getUser();

   return (
       <ImaginaryContext name='carAdContext'
          values= {
              currentCar : car,
              loggedUser: user,   
          }>
           <CarAd/>
        <ImaginaryContext/>   
    );
}

And then it would be used like this:

export const CarAd = () => {
     
     const { currentCar, loggedUser } = useImaginaryContext('carAdContext');
     
     return (
         <h1>{ currentCar.brand }</h1>
         <h2>{ currentCar.model }</h2>
         <p>{ currentCar.mileage }</p>
         <p>{ loggedUser.name } is selling this car </p>
     );

}

(I am also interested in other js frameworks that can do something similar)

I’m working on a React app where I update the component state using setState, but the new state isn’t available immediately after calling setState. I’m confused because I thought it would update right away.

Explain clearly:

What you’re trying to do
What’s going wrong
Any error messages or wrong behavior you see

I tried logging the state value immediately after calling setState, expecting it to show the new value, but it still showed the old one. I also tried using async/await, but it didn’t fix the problem.

Explain:

What steps you took
What result you wanted
What actually happened

My Webpack is set up to randomise variable names, remove blank space, all the basics to basically obfuscate my javascript files and stop them being human-readable.
I have my files set up sort of like:

/src/
     index.php
     /working/
             test.php
     /js/
         app.js
         index.js
         /working/
                 test.js
    /css/
        ... the same as above but .css not .js

Now it’s supposed to obfuscate the files when outputting to /dist/ but while it does do this for app.js it doesn’t for index.js or test.js which I can’t quite figure out why or how to fix it.
My webpack.prod.config.js file (for production mode) is as follows:

/* eslint-disable import/no-extraneous-dependencies */
const { merge } = require('webpack-merge');
const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');

const webpackConfiguration = require('../webpack.config');

module.exports = merge(webpackConfiguration, {
  mode: 'production',

  devtool: false, // Disable source maps for production (optional)

  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        parallel: true,
        terserOptions: {
          mangle: true, 
          compress: {
            drop_console: true, 
          },
          output: {
            comments: false,
          },
        },
        test: /.js$/i,
      }),
      new CssMinimizerPlugin(), 
    ],
    splitChunks: {
      chunks: 'all', 
      automaticNameDelimiter: '-', 
      name: 'commons', 
    },
  },

  performance: {
    maxEntrypointSize: 512000, // Max size for entry points
    maxAssetSize: 512000, // Max size for assets
  },

  plugins: [],
});

but it just doesn’t apply to anything but app.js beyond including it in the resulting file multiple times (generally can appear up to 6-9 times, same for the page-specific .js files such as index.js)

I originally thought that it might’ve been the way the entry points were handled in the webpack.config.js file,

// Dynamically set entry points for each page
const entry = templateFiles.reduce((entries, template) => {
  const pageName = path.relative(environment.paths.source, template.output).replace('.php', '');

  // Automatically resolve JS files for each page
  const jsFile = path.join(environment.paths.source, 'js', `${pageName}.js`);
  const cssFile = path.join(environment.paths.source, 'css', `${pageName}.css`);

  if (fs.existsSync(jsFile)) {
    entries[pageName] = [jsFile, cssFile];  // Ensure the page has its JS and CSS
  }

  return entries;
}, {
  app: path.join(environment.paths.source, 'js', 'app.js'),

});

so as an experiment I tried to add the index to alongside app as a default entry point that appears everywhere, but it made zero difference – helping me rule it out but not helping me find the solution.

}, {
  app: path.join(environment.paths.source, 'js', 'app.js'),
  index: path.join(environment.paths.source, 'js', 'index.js'),
});

Pls i need the source code for netflix and youtube homepage

i need the need the source code to start building similar projects using HTML,CSS,JS i’d be happy if i can get the source code to aid my learning process its make learning much easier