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not able to make multiple work group working and causing freeze

I am doing create multiple worker threads, in my case, i am trying to create 2:
This is my code to create work thread
function createWorker(data1, data2) {
return new Promise((resolve) => {
let worker = new Worker();
worker.postMessage(data1, data2);
worker.onmessage = (event) => {
postMessageRes = event.data;
if (postMessageRes == 200) {
// loadCOPC();
} else {
workerCount += 1;
let position = postMessageRes[0];
let color = postMessageRes[1];
for (let i = 0; i < position.length; i++) {
positions.push(position[i]);
colors.push(colors[i]);
}
resolve(true);
}
};
});
}
and using it in my loop
for (let m = 0; m < keyCountMap.length; ) {
let remaining = totalNodes - doneCount;
let numbWorker = Math.min(chunk, remaining);
for (let i = 0; i < numbWorker; i++) {
promises.push(createWorker([keyCountMap[m], keyCountMap[m + 1]]));
m += 2;
}
Promise.all(promises).then((response) => {
console.log("one chunk finishes");
});
}
The code works fine if i instead of all these use one static work thread and call postMessage in the loop for only one but not while i am trying to make chunk like here in the code.
When i run the code, my browser freeze
This is my worker file:
import { Copc, Key } from "copc";
import * as THREE from "three";
const color = new THREE.Color();
const colors = [];
let firstTime = true;
var nodePages, pages, receivedData, copc;
let x_min, y_min, z_min, x_max, y_max, z_max, width;
let positions = [];
let filename = "https://s3.amazonaws.com/data.entwine.io/millsite.copc.laz";
const readPoints = (id, getters) => {
let returnPoint = getXyzi(id, getters);
positions.push(
returnPoint[0] - x_min - 0.5 * width,
returnPoint[1] - y_min - 0.5 * width,
returnPoint[2] - z_min - 0.5 * width
);
const vx = (returnPoint[3] / 65535) * 255;
color.setRGB(vx, vx, vx);
colors.push(color.r, color.g, color.b);
firstTime = false;
};
function getXyzi(index, getters) {
return getters.map((get) => get(index));
}
async function load() {
copc = await Copc.create(filename);
let scale = copc.header.scale[0];
[x_min, y_min, z_min, x_max, y_max, z_max] = copc.info.cube;
width = Math.abs(x_max - x_min);
// let center_x = (x_min + x_max) / 2;
// let center_y = (y_min + y_max) / 2;
// let center_z = (z_min + z_max) / 2;
receivedData = await Copc.loadHierarchyPage(
filename,
copc.info.rootHierarchyPage
);
nodePages = receivedData.nodes;
pages = receivedData.pages;
postMessage(200);
}
async function loadData(myRoot, pointCount) {
const view = await Copc.loadPointDataView(filename, copc, myRoot);
let getters = ["X", "Y", "Z", "Intensity"].map(view.getter);
for (let j = 0; j < pointCount; j += 1) {
readPoints(j, getters);
}
postMessage([positions, colors]);
}
load();
onmessage = function (message) {
let mapIndex = message.data[0];
let pointCount = message.data[1];
console.log(mapIndex);
let myRoot = nodePages[mapIndex];
loadData(myRoot, pointCount);
};

The issue might be due to creating multiple worker threads in a loop, which could lead to a large number of worker threads and result in high memory usage and ultimately lead to freezing of the browser.
One approach to resolve this issue is to limit the number of worker threads created at a time by setting a maximum number of workers, and creating new workers only when some workers have completed their tasks.
Here's an example of the code that implements this approach:
const MAX_WORKERS = 4;
let promises = [];
let workerCount = 0;
function createWorker(data1, data2) {
return new Promise((resolve) => {
let worker = new Worker();
worker.postMessage(data1, data2);
worker.onmessage = (event) => {
postMessageRes = event.data;
if (postMessageRes == 200) {
// loadCOPC();
} else {
workerCount += 1;
let position = postMessageRes[0];
let color = postMessageRes[1];
for (let i = 0; i < position.length; i++) {
positions.push(position[i]);
colors.push(colors[i]);
}
if (workerCount === MAX_WORKERS) {
workerCount = 0;
promises = [];
}
resolve(true);
}
};
});
}
for (let m = 0; m < keyCountMap.length; ) {
let remaining = totalNodes - doneCount;
let numbWorker = Math.min(chunk, remaining);
for (let i = 0; i < numbWorker; i++) {
promises.push(createWorker([keyCountMap[m], keyCountMap[m + 1]]));
m += 2;
}
if (workerCount === MAX_WORKERS) {
Promise.all(promises).then((response) => {
console.log("one chunk finishes");
});
}
}

JavaScript run one function after another

I am trying to create a visual selection sort. finMin() will go through the array one by one displaying the new min when found. I want to use this function in a loop for selection sort. If the function is run one time, then everything is fine, but if findMin() is run in a loop, then the function has bugs.
If a function is run in a loop such as for(let i=0; i<3; i++){findMin();} does the second iteration of the loop run immediately or does it wait for findMin to return before i == 1? I believe that this loop should be sequential, but I do not know why the code does not work in a loop then.
var gBars = [];
var gSelected = 19;
var gFinished = 19;
var changed = false;
var step = 0;
function Bar(index, height){
this.index = index;
this.height = height;
this.getIndex = function(){
console.log(this.index);
};
this.getHeight = function(){
console.log(this.height);
};
this.getStats = function(){
console.log(this.index + ' ' + this.height);
}
this.setHeight = function(h){
this.height = h;
}
this.setIndex = function(i){
this.index = i;
}
}
function insertAfter(newNode, referenceNode){
referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
}
function setHeight(i, h){
document.getElementById(i).style.height = h + 'em';
}
function addBar(i, h){
//base case i = 0
//first bar
if(i === 0){
var currentDiv = document.getElementById("root");
d = document.createElement('div');
d.setAttribute("id", 'block'+i);
d.setAttribute("class", 'block');
gBars[i] = new Bar(i, h);
currentDiv.appendChild(d);
setHeight('block'+i,h);
}
else {
let last = i-1;
var currentDiv = document.getElementById('block'+last);
d = document.createElement('div');
d.setAttribute("id", 'block'+i);
d.setAttribute("class", 'block');
gBars[i] = new Bar(i, h);
insertAfter(d, currentDiv);
setHeight('block'+i,h);
}
}
function selSort(){
for(let i=0; i<10; i++){
findMin(gFinished);
}
}
function findMin(gFinished) {
let min = gBars[gFinished].height;
//start at 18 because bars are rotated 180deg
//go backwards so it appears to go forwards
var delay = 500;
let i = gFinished - 1;
min = setTimeout(timeout(i, min), delay);
return min;
}
function timeoutchange(){
var swapped = document.getElementById('block'+gFinished);
var selected = document.getElementById('block'+gSelected);
let temp = gBars[gFinished].height;
swapped.style.height = gBars[gSelected].height + 'em';
selected.style.height = temp + 'em';
selected.style.backgroundColor = "grey";
var selected = document.getElementById('block'+gFinished);
selected.style.backgroundColor = "green";
gFinished--;
var selected = document.getElementById('block'+gFinished);
selected.style.backgroundColor = "blue";
gSelected = gFinished;
}
function timeout(i, min) {
console.log("Next loop: " + i);
if(i==18){
var selected = document.getElementById('block19');
selected.style.backgroundColor = "blue";
}
if(min > gBars[i].height) {
min = gBars[i].height;
var selected = document.getElementById('block'+i);
selected.style.backgroundColor = "blue";
console.log('new min ' + min);
selected = document.getElementById('block'+gSelected);
selected.style.backgroundColor = "grey";
gSelected = i;
}
i--;
if (i == 0) {
console.log("End");
var swapped = document.getElementById('block'+gFinished);
swapped.style.backgroundColor = "red";
setTimeout(function(){
return timeoutchange();
},1000)
step++;
return min;
} else {
setTimeout(function(){
return timeout(i, min);
},500)
}
}
function init(){
for(let i=0; i<20; i++){
let ran = Math.floor(Math.random() * 50 + 1);
gBars[i] = new Bar(i,ran);
addBar(i,ran);
}
for(let i=0; i<20; i++){
gBars[i].getStats();
}
//works
findMin(gFinished);
//findMin does not work in loop
//why?
//selSort();
return;
}
init();
.selected{
background-color:blue;
}
.block{
border:1px solid rgba(0,0,0,.4);
width:20px;
background-color:grey;
}
#root{
display:flex;
transform:rotate(180deg);
position:absolute;
left:10%;
}
<html>
<head>
<link rel="stylesheet" href="style.css">
</head>
<body>
<button>sort</button>
<div id="root"></div>
</body>
<script src="selectionsort.js"></script>
</html>

What you want to do is use JavaScript Promises. (https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) There you have a concept called chaining so that you can chain your functions one after the other based on execution (in this case resolved). For an example Let say you have to functions:
function a() {
setTimeout( function() {
resolve("Success!") // Yay! Everything went well!
}, 250)
}
function b() {
setTimeout( function() {
resolve("Success 2!") // Yay! Everything went well!
}, 250)
}
you can make these promises and chain them one after the other:
let a = new Promise((resolve, reject) => {
setTimeout( function() {
resolve("Success!") // Yay! Everything went well!
}, 250)
})
let b = new Promise((resolve, reject) => {
setTimeout( function() {
resolve("Success2!") // Yay! Everything went well!
}, 250)
})
let c = new Promise((resolve, reject) => {
setTimeout( function() {
resolve("Success3!") // Yay! Everything went well!
}, 250)
})
a().then(()=>{
return b();
}).then(()=>{
return c();
});

setTimeout returns a number representing the id of the timer, so when running findMin() in a loop it will return that, and immediately after execute the next iteration.
To make the loop wait for the timeout you'll have to await for a promise that is resolved after the delay
for (let i = 0; i < 3; i++) {
min = await new Promise((resolve) => {
setTimeout(() => {
resolve(timeout(i, min))
}, 500);
})
}

How do I go through random item from DropDownList with JavaScript?

I want to automatic go through random items from the DropDownList1.
It's working, but it's going by the order first to last, and I want to go through items randomly.
/* function to automatic select DropDownList1 items */
function selectFromDropdown(selector, text) {
$(selector).find('option').each(function() {
if ($(this).text() == text) {
$(selector).val($(this).val());
return false;
}
})
}
$(document).ready(function() {
let numberOfTimes = 0;
const time = 1000 //3s
let values = [];
$('#DropDownList1').find('option').each(function() {
values.push($(this).text())
});
console.log(values);
const interval = setInterval(function() {
selectFromDropdown('#DropDownList1', values[numberOfTimes])
if (numberOfTimes == values.length - 1) {
clearInterval(interval);
} else {
numberOfTimes = numberOfTimes + 1;
}
},
time);
});
Here the snnipet: https://jsfiddle.net/lucasangelo_/17Lgr0kc/6/

If you want to get random values from a select, then you can use the next function:
function getRandomValuesFromSelect(selector, numberOfItemsWanted)
{
var valuesSelected = [];
var childrenSelect = document.getElementById(selector).children;
for (var i = 0; i < numberOfItemsWanted; i++) {
var randomValue = Math.floor(Math.random() * childrenSelect.length);
var randomOption = childrenSelect[randomValue];
if (valuesSelected.indexOf(randomOption.value) < 0) {
valuesSelected.push(randomOption.value);
} else {
i--;
}
}
return valuesSelected;
}
Then you could call it like so:
getRandomValuesFromSelect("DropDownList1", 3);

The answer is:
/* function to automatic select DropDownList1 items */
function selectFromDropdown(selector, text) {
$(selector).find('option').each(function() {
if ($(this).text() == text) {
$(selector).val($(this).val());
return false;
}
})
}
function getRandomNumber(min, max) {
return (Math.random() * (max - min) + min).toFixed(0);
}
$(document).ready(function() {
let numeroDeVezes = 0;
const tempoEntreCadaChamada = 1000 //3s
let valores = [];
$('#DropDownList1').find('option').each(function() {
valores.push($(this).text())
});
console.log(valores);
const interval = setInterval(function() {
const randomNumber = getRandomNumber(0, valores.length - 1);
const randomItem = valores[randomNumber];
//console.log(randomItem);
selectFromDropdown('#DropDownList1', randomItem),
console.log(`${numeroDeVezes} - Chamou do PostBack para ${randomItem}`);
//__doPostBack('LButton3', 'OnClick');
if (numeroDeVezes == valores.length - 1) {
console.log("Percorreu todos, mata o setInterval");
clearInterval(interval);
} else {
numeroDeVezes = numeroDeVezes + 1;
}
},
tempoEntreCadaChamada);
});
Thank you boys!

Put a number of spheres in an animation with the same distance

I have a code that performs animation. a sphere moves from the beginning of a line to the end of the line. When starts again ends the motion again. starts from the first vertex and ends at the last vertex of the line.
I want to put 20 or so spheres, doing the same animation, but at the same time and in the same distance.
How can I do it?
this is my code:
var vertices = mesh.geometry.vertices;
var duration = 10;
function startToEnd() {
var i = 0;
async.eachSeries(vertices, function(vertice, callback) {
if (i !== 0) {
sphere.position.copy(vertices[i - 1]);
new TWEEN.Tween(sphere.position).to(vertices[i], duration).delay(duration).onComplete(function() {
callback(null);
}).start();
} else {
callback(null);
}
i++;
}, startToEnd);
}
startToEnd();
this image is a example..
this is result of my code

I got something that I think is pretty close to what you want:
var vertices = mesh.geometry.vertices;
var duration = 20;
var spheres = [];
var amountOfSpheres = 20;
for (var i = 0; i < amountOfSpheres; i++) {
spheres.push(new THREE.Sprite(rttMaterial));
scene.add(spheres[i]);
}
function endlessArrayIndex(index, arrayLength) {
if (index >= arrayLength) {
return index % arrayLength;
}
return index;
}
function startToEnd() {
i = 0;
async.each(spheres, function(sphere, cb1) {
var j = 0;
var verticeIndex = endlessArrayIndex(i * Math.round(vertices.length / amountOfSpheres), vertices.length);
async.eachSeries(vertices, function(vertice, cb2) {
if (verticeIndex !== 0) {
var verticeToCopy = vertices[verticeIndex - 1];
sphere.position.copy(verticeToCopy);
new TWEEN.Tween(sphere.position).to(vertices[verticeIndex], duration).delay(duration).onComplete(function() {
cb2(null);
}).start();
} else {
cb2(null);
}
verticeIndex = endlessArrayIndex(verticeIndex + 1, vertices.length);
}, cb1);
i++;
}, startToEnd);
}
startToEnd();
Result of the above code:

Is it Possible/Okay to have two controller files for one view in meteor?

so heres my folder structure for the client:
https://s3.amazonaws.com/f.cl.ly/items/0I0S063e3U0A2o2s3k21/Image%202014-12-05%20at%206.42.17%20PM.png
The problem is I have two states for tournaments... One Live and One noLive.
The use all the exact same views ect but could potentially have very different functionality.
Is there a trick were I can use two completely different controllers for the same view based on the data the view needs to load in iron router or something?
-thanks
For reference here is my:
routes.js for tourneys:
/* Tournaments / Browse section */
Router.route('/tournaments/:_id', function () {
this.fastRender = true;
// add the subscription handle to our waitlist
this.wait(Meteor.subscribe('campaigns'));
// this.ready() is true if all items in the wait list are ready
// console.log("Tournaments.findOne({_id: this.params._id}:", Campaigns.findOne({_id: this.params._id}));
if (this.ready()) {
this.render('tournament', {
data: function () {
return Campaigns.findOne({_id: this.params._id});
}
});
} else {
this.render('loading');
}
});
tournaments.js:
/* Globals */
Template.tournament.rendered = function () {
var self = this;
var participants = $('.participant-id');
var currentParticipant;
var nextRound;
var thisMatch;
var nextMatch;
var bracket;
participants.map(function(index, value){
if ($(value).text() === Meteor.userId()) {
if ($(value).parent().find('.participant-status').text() === 'undetermined') {
nextRound = $(value).parent().find('.participant-round').text();
thisMatch = $(value).parent().find('.participant-match').text();
bracket = $(value).parent().parent().parent().find('.participant');
};
};
});
nextRound = parseInt(nextRound) + 1;
nextMatch = Math.round(parseInt(thisMatch)/2) - 1;
if (parseInt(thisMatch) % 2 != 0) {
currentParticipant = 0;
}else{
currentParticipant = 1;
}
var winnerOptions = '';
var winnerBox = $('<div class="select-winner">');
bracket.map(function(index, value) {
winnerOptions += '<span class="winner-option"> '+$(value).find('.participant-title').text()+' <div class="winner-info"> '+$(value).find('a').html()+' </div> </span>'
});
winnerBox.append(winnerOptions);
$($($('.round'+nextRound).find('li')[nextMatch]).find('.participant')[currentParticipant]).removeClass('loser').addClass('undetermined');
$($($('.round'+nextRound).find('li')[nextMatch]).find('.participant')[currentParticipant]).find('a').addClass('tooltip').html(winnerBox);
var tournamentStartTime = function(){
var d = new Date();
var n = d.getTime();
var currentTime = TimeSync.serverTime(n);
var startTime = self.data.card.startTime;
var difference = startTime - currentTime;
var hoursDifference = Math.floor(difference/1000/60/60);
difference -= hoursDifference*1000*60*60
var minutesDifference = Math.floor(difference/1000/60);
difference -= minutesDifference*1000*60
var secondsDifference = Math.floor(difference/1000);
/* if ends (make tournament live server side?) */
if (hoursDifference < 0 || minutesDifference < 0 || secondsDifference < 0) {
Meteor.clearInterval(tStartTime);
Session.set("tournamentStartTime", false);
}else{
if (hoursDifference < 10) {hoursDifference = "0"+hoursDifference;}
if (minutesDifference < 10) {minutesDifference = "0"+minutesDifference;}
if (secondsDifference < 10) {secondsDifference = "0"+secondsDifference;}
var formattedTime = hoursDifference + ':' + minutesDifference + ':' + secondsDifference;
Session.set("tournamentStartTime", formattedTime);
}
};
Session.set("tournamentStartTime", '00:00:00');
tournamentStartTime();
var tStartTime = Meteor.setInterval(tournamentStartTime, 1000);
};
Template.tournament.events({
// Select winner from 2 options in tooltip
// Then previous round is given winner class on correct person
'click .winner-option': function(event){
// var self = $(event.target)
// var winner = self.text()
// self.parent().hide()
// self.closest('.participant').removeClass('undetermined')
// self.parent().siblings('.participant-title').text(winner)
// var classes = self.closest('ul').prev().attr('class')
// $('.' + classes.substring(0, classes.indexOf(' ')) + ' .participant-title').each(function() {
// if ($(this).text() === winner) {
// $(this).parent().parent().removeClass('loser').addClass('winner')
// }
// // else {
// // $(this).parent().parent().removeClass('winner').addClass('loser')
// // }
// });
// // $(.previousULClass .
$('#theaterMode').show();
}
});
Template.tournament.helpers({
round: function() {
var tournament = this.tournament.brackets;
var rounds = tournament.length;
var results = [];
tournament.map(function(value, index){
var currentRound = index + 1;
results.push({rounds: rounds, currentRound: currentRound, matches: value});
});
// console.log("results:", results);
return results;
},
match: function(){
// console.log("matches:", this.matches);
return this.matches;
},
participant: function(){
var results = [];
// console.log("this:", this);
this.map(function (value, index) {
// console.log("value, index:", value, index);
var type = value['win'];
var obj = {
id: value['id'],
rank: value['id'].slice(0,3),
displayName: value['displayName'],
thisRound: value['round'],
thisMatch: value['match'],
status: type
};
if (type === true || type === 'undetermined') {
obj.winner = true;
}else{
obj.loser = true;
}
results.push(obj);
});
// console.log("results:", results);
return results;
},
tournamentStartTime: function(){
return Session.get('tournamentStartTime');
}
});

How do you recognize which state is current? You should post some code, routes.js, tournament.js and your view.blade, for better understanding what you really wanna do and for figure out, what the best pratice is. :)