Audio HTML5 check if all audio elements have fully loaded - javascript

I'm building a quiz that uses audio and is marked on the response time of the user so I want all the audio html elements to be fully loaded before the user can start the quiz.
I just need some sort of loop that checks if ALL the audio elements have all the song/audio loaded completely.
I've looked at readyState etc but I cant find its use within a loop of all the audio on the page. I would like a javascript or jQuery solution if possible.
I thought something like below would do it but nope:
var ready_count = 0;
var x = document.getElementsByClassName("question-audio");
for (var i = 0; i < x.length; ++i) {
var item = x[i];
item.addEventListener("readystatechange", function() {
if (item.readyState == 4) {
ready_count++;
}
}
if(ready_count == x.length){
//do something
}
Any help appreciated.

Here's a jQuery version:
function audioReady(){
return $.when.apply($, $('audio').map(function(){
var ready = new $.Deferred();
$(this).one('canplay', ready.resolve);
return ready.promise();
}));
}
If you don't have jQuery and/or don't care about older browsers:
function audioReady(){
var audio = [].slice.call(document.getElementsByTagName('audio'));
return Promise.all(audio.map(function(el){
return new Promise(function(resolve, reject){
el.addEventListener('canplay', resolve);
});
}));
}
Either way, you'll be able to use the function as such:
audioReady().then(function(){
// do something
});

Related

Web Speech API reads in wrong language in Safari [duplicate]

Following HTML shows empty array in console on first click:
<!DOCTYPE html>
<html>
<head>
<script>
function test(){
console.log(window.speechSynthesis.getVoices())
}
</script>
</head>
<body>
Test
</body>
</html>
In second click you will get the expected list.
If you add onload event to call this function (<body onload="test()">), then you can get correct result on first click. Note that the first call on onload still doesn't work properly. It returns empty on page load but works afterward.
Questions:
Since it might be a bug in beta version, I gave up on "Why" questions.
Now, the question is if you want to access window.speechSynthesis on page load:
What is the best hack for this issue?
How can you make sure it will load speechSynthesis, on page load?
Background and tests:
I was testing the new features in Web Speech API, then I got to this problem in my code:
<script type="text/javascript">
$(document).ready(function(){
// Browser support messages. (You might need Chrome 33.0 Beta)
if (!('speechSynthesis' in window)) {
alert("You don't have speechSynthesis");
}
var voices = window.speechSynthesis.getVoices();
console.log(voices) // []
$("#test").on('click', function(){
var voices = window.speechSynthesis.getVoices();
console.log(voices); // [SpeechSynthesisVoice, ...]
});
});
</script>
<a id="test" href="#">click here if 'ready()' didn't work</a>
My question was: why does window.speechSynthesis.getVoices() return empty array, after page is loaded and onready function is triggered? As you can see if you click on the link, same function returns an array of available voices of Chrome by onclick triger?
It seems Chrome loads window.speechSynthesis after the page load!
The problem is not in ready event. If I remove the line var voice=... from ready function, for first click it shows empty list in console. But the second click works fine.
It seems window.speechSynthesis needs more time to load after first call. You need to call it twice! But also, you need to wait and let it load before second call on window.speechSynthesis. For example, following code shows two empty arrays in console if you run it for first time:
// First speechSynthesis call
var voices = window.speechSynthesis.getVoices();
console.log(voices);
// Second speechSynthesis call
voices = window.speechSynthesis.getVoices();
console.log(voices);
According to Web Speech API Errata (E11 2013-10-17), the voice list is loaded async to the page. An onvoiceschanged event is fired when they are loaded.
voiceschanged: Fired when the contents of the SpeechSynthesisVoiceList, that the getVoices method will return, have changed. Examples include: server-side synthesis where the list is determined asynchronously, or when client-side voices are installed/uninstalled.
So, the trick is to set your voice from the callback for that event listener:
// wait on voices to be loaded before fetching list
window.speechSynthesis.onvoiceschanged = function() {
window.speechSynthesis.getVoices();
...
};
You can use a setInterval to wait until the voices are loaded before using them however you need and then clearing the setInterval:
var timer = setInterval(function() {
var voices = speechSynthesis.getVoices();
console.log(voices);
if (voices.length !== 0) {
var msg = new SpeechSynthesisUtterance(/*some string here*/);
msg.voice = voices[/*some number here to choose from array*/];
speechSynthesis.speak(msg);
clearInterval(timer);
}
}, 200);
$("#test").on('click', timer);
After studying the behavior on Google Chrome and Firefox, this is what can get all voices:
Since it involves something asynchronous, it might be best done with a promise:
const allVoicesObtained = new Promise(function(resolve, reject) {
let voices = window.speechSynthesis.getVoices();
if (voices.length !== 0) {
resolve(voices);
} else {
window.speechSynthesis.addEventListener("voiceschanged", function() {
voices = window.speechSynthesis.getVoices();
resolve(voices);
});
}
});
allVoicesObtained.then(voices => console.log("All voices:", voices));
Note:
When the event voiceschanged fires, we need to call .getVoices() again. The original array won't be populated with content.
On Google Chrome, we don't have to call getVoices() initially. We only need to listen on the event, and it will then happen. On Firefox, listening is not enough, you have to call getVoices() and then listen on the event voiceschanged, and set the array using getVoices() once you get notified.
Using a promise makes the code more clean. Everything related to getting voices are in this promise code. If you don't use a promise but instead put this code in your speech routine, it is quite messy.
You can write a voiceObtained promise to resolve to a voice you want, and then your function to say something can just do: voiceObtained.then(voice => { }) and inside that handler, call the window.speechSynthesis.speak() to speak something. Or you can even write a promise speechReady("hello world").then(speech => { window.speechSynthesis.speak(speech) }) to say something.
heres the answer
function synthVoice(text) {
const awaitVoices = new Promise(resolve=>
window.speechSynthesis.onvoiceschanged = resolve)
.then(()=> {
const synth = window.speechSynthesis;
var voices = synth.getVoices();
console.log(voices)
const utterance = new SpeechSynthesisUtterance();
utterance.voice = voices[3];
utterance.text = text;
synth.speak(utterance);
});
}
At first i used onvoiceschanged , but it kept firing even after the voices was loaded, so my goal was to avoid onvoiceschanged at all cost.
This is what i came up with. It seems to work so far, will update if it breaks.
loadVoicesWhenAvailable();
function loadVoicesWhenAvailable() {
voices = synth.getVoices();
if (voices.length !== 0) {
console.log("start loading voices");
LoadVoices();
}
else {
setTimeout(function () { loadVoicesWhenAvailable(); }, 10)
}
}
setInterval solution by Salman Oskooi was perfect
Please see https://jsfiddle.net/exrx8e1y/
function myFunction() {
dtlarea=document.getElementById("details");
//dtlarea.style.display="none";
dtltxt="";
var mytimer = setInterval(function() {
var voices = speechSynthesis.getVoices();
//console.log(voices);
if (voices.length !== 0) {
var msg = new SpeechSynthesisUtterance();
msg.rate = document.getElementById("rate").value; // 0.1 to 10
msg.pitch = document.getElementById("pitch").value; //0 to 2
msg.volume = document.getElementById("volume").value; // 0 to 1
msg.text = document.getElementById("sampletext").value;
msg.lang = document.getElementById("lang").value; //'hi-IN';
for(var i=0;i<voices.length;i++){
dtltxt+=voices[i].lang+' '+voices[i].name+'\n';
if(voices[i].lang==msg.lang) {
msg.voice = voices[i]; // Note: some voices don't support altering params
msg.voiceURI = voices[i].voiceURI;
// break;
}
}
msg.onend = function(e) {
console.log('Finished in ' + event.elapsedTime + ' seconds.');
dtlarea.value=dtltxt;
};
speechSynthesis.speak(msg);
clearInterval(mytimer);
}
}, 1000);
}
This works fine on Chrome for MAC, Linux(Ubuntu), Windows and Android
Android has non-standard en_GB wile others have en-GB as language code
Also you will see that same language(lang) has multiple names
On Mac Chrome you get en-GB Daniel besides en-GB Google UK English Female and n-GB Google UK English Male
en-GB Daniel (Mac and iOS)
en-GB Google UK English Female
en-GB Google UK English Male
en_GB English United Kingdom
hi-IN Google हिन्दी
hi-IN Lekha (Mac and iOS)
hi_IN Hindi India
Another way to ensure voices are loaded before you need them is to bind their loading state to a promise, and then dispatch your speech commands from a then:
const awaitVoices = new Promise(done => speechSynthesis.onvoiceschanged = done);
function listVoices() {
awaitVoices.then(()=> {
let voices = speechSynthesis.getVoices();
console.log(voices);
});
}
When you call listVoices, it will either wait for the voices to load first, or dispatch your operation on the next tick.
I used this code to load voices successfully:
<select id="voices"></select>
...
function loadVoices() {
populateVoiceList();
if (speechSynthesis.onvoiceschanged !== undefined) {
speechSynthesis.onvoiceschanged = populateVoiceList;
}
}
function populateVoiceList() {
var allVoices = speechSynthesis.getVoices();
allVoices.forEach(function(voice, index) {
var option = $('<option>').val(index).html(voice.name).prop("selected", voice.default);
$('#voices').append(option);
});
if (allVoices.length > 0 && speechSynthesis.onvoiceschanged !== undefined) {
// unregister event listener (it is fired multiple times)
speechSynthesis.onvoiceschanged = null;
}
}
I found the 'onvoiceschanged' code from this article: https://hacks.mozilla.org/2016/01/firefox-and-the-web-speech-api/
Note: requires JQuery.
Works in Firefox/Safari and Chrome (and in Google Apps Script too - but only in the HTML).
async function speak(txt) {
await initVoices();
const u = new SpeechSynthesisUtterance(txt);
u.voice = speechSynthesis.getVoices()[3];
speechSynthesis.speak(u);
}
function initVoices() {
return new Promise(function (res, rej){
speechSynthesis.getVoices();
if (window.speechSynthesis.onvoiceschanged) {
res();
} else {
window.speechSynthesis.onvoiceschanged = () => res();
}
});
}
While the accepted answer works great but if you're using SPA and not loading full-page, on navigating between links, the voices will not be available.
This will run on a full-page load
window.speechSynthesis.onvoiceschanged
For SPA, it wouldn't run.
You can check if it's undefined, run it, or else, get it from the window object.
An example that works:
let voices = [];
if(window.speechSynthesis.onvoiceschanged == undefined){
window.speechSynthesis.onvoiceschanged = () => {
voices = window.speechSynthesis.getVoices();
}
}else{
voices = window.speechSynthesis.getVoices();
}
// console.log("voices", voices);
I had to do my own research for this to make sure I understood it properly, so just sharing (feel free to edit).
My goal is to:
Get a list of voices available on my device
Populate a select element with those voices (after a particular page loads)
Use easy to understand code
The basic functionality is demonstrated in MDN's official live demo of:
https://github.com/mdn/web-speech-api/tree/master/speak-easy-synthesis
but I wanted to understand it better.
To break the topic down...
SpeechSynthesis
The SpeechSynthesis interface of the Web Speech API is the controller
interface for the speech service; this can be used to retrieve
information about the synthesis voices available on the device, start
and pause speech, and other commands besides.
Source
onvoiceschanged
The onvoiceschanged property of the SpeechSynthesis interface
represents an event handler that will run when the list of
SpeechSynthesisVoice objects that would be returned by the
SpeechSynthesis.getVoices() method has changed (when the voiceschanged
event fires.)
Source
Example A
If my application merely has:
var synth = window.speechSynthesis;
console.log(synth);
console.log(synth.onvoiceschanged);
Chrome developer tools console will show:
Example B
If I change the code to:
var synth = window.speechSynthesis;
console.log("BEFORE");
console.log(synth);
console.log(synth.onvoiceschanged);
console.log("AFTER");
var voices = synth.getVoices();
console.log(voices);
console.log(synth);
console.log(synth.onvoiceschanged);
The before and after states are the same, and voices is an empty array.
Solution
Although i'm not confident implementing Promises, the following worked for me:
Defining the function
var synth = window.speechSynthesis;
// declare so that values are accessible globally
var voices = [];
function set_up_speech() {
return new Promise(function(resolve, reject) {
// get the voices
var voices = synth.getVoices();
// get reference to select element
var $select_topic_speaking_voice = $("#select_topic_speaking_voice");
// for each voice, generate select option html and append to select
for (var i = 0; i < voices.length; i++) {
var option = $("<option></option>");
var suffix = "";
// if it is the default voice, add suffix text
if (voices[i].default) {
suffix = " -- DEFAULT";
}
// create the option text
var option_text = voices[i].name + " (" + voices[i].lang + suffix + ")";
// add the option text
option.text(option_text);
// add option attributes
option.attr("data-lang", voices[i].lang);
option.attr("data-name", voices[i].name);
// append option to select element
$select_topic_speaking_voice.append(option);
}
// resolve the voices value
resolve(voices)
});
}
Calling the function
// in your handler, populate the select element
if (page_title === "something") {
set_up_speech()
}
Android Chrome - turn off data saver. It was helpfull for me.(Chrome 71.0.3578.99)
// wait until the voices load
window.speechSynthesis.onvoiceschanged = function() {
window.speechSynthesis.getVoices();
};
let voices = speechSynthesis.getVoices();
let gotVoices = false;
if (voices.length) {
resolve(voices, message);
} else {
speechSynthesis.onvoiceschanged = () => {
if (!gotVoices) {
voices = speechSynthesis.getVoices();
gotVoices = true;
if (voices.length) resolve(voices, message);
}
};
}
function resolve(voices, message) {
var synth = window.speechSynthesis;
let utter = new SpeechSynthesisUtterance();
utter.lang = 'en-US';
utter.voice = voices[65];
utter.text = message;
utter.volume = 100.0;
synth.speak(utter);
}
Works for Edge, Chrome and Safari - doesn't repeat the sentences.

Check if Typekit has loaded with JavaScript

I'm currently building a layout that animates using jQuery, and I am finding out the width of a div using .width(). However, sometimes it is getting the .width() before TypeKit has been activated (thus giving an incorrect width).
Is there a way to check when TypeKit has loaded by using an if statement?
Yes, there is.
Instead of calling the usual try{Typekit.load();}catch(e){} in your head tag, you can use Typekit.load with callbacks (docs):
try {
Typekit.load({
loading: function() {
// JavaScript to execute when fonts start loading
},
active: function() {
// JavaScript to execute when fonts become active
// this is where you want to init your animation stuff
},
inactive: function() {
// JavaScript to execute when fonts become inactive
}
})
} catch(e) {}
I've literally just done this for my own project, where I don't have the ability to change that code. So If you're in the same situation, try this:
// configure these
var check_interval = 100; // how many ms to leave before checking again
var give_up_after_ms = 2000; // how many ms before we consider the page loaded anyway.
// caches etc
var count = 0;
var count_limit = give_up_after_ms / check_interval;
var html = $("html");
var font_loaded_check_interval;
var check_load_status = function(callback) {
if(html.hasClass("wf-active") || count >= count_limit) {
// fonts are loaded or give_up_after_ms was reached
if(font_loaded_check_interval) {
clearInterval(font_loaded_check_interval);
font_loaded_check_interval = null;
}
// call the callback
callback.call(this);
return true;
}
count++;
return false;
};
function doneCallback() {
// code to run when fonts are loaded or timeout reached
alert("Done");
}
// check on initial run of JS, and if not ready, start checking at regular intervals.
if( ! check_load_status(doneCallback)) {
font_loaded_check_interval = setInterval(function() {
check_load_status(doneCallback);
}, check_interval);
}

Appending and Preloading Images with JavaScript

I'm in the process of creating a site that preloads several large gifs. Due to the size of the images. I need them all to be loaded before displayed to the user. In the past I have done this numerous times using something basic like this:
var image = new Image();
image.onload = function () { document.appendChild(image); }
image.src = '/myimage.jpg';
However, i'm loading a group of images from an array, which contains the image source url. It should show a loading message and once they have all loaded it show perform a callback and hide the loading message etc.
The code I've been using is below:
var images = ['image1.gif', 'image2.gif', 'image3.gif'];
function preload_images (target, callback) {
// get feedback container
var feedback = document.getElementById('feedback');
// show feedback (loading message)
feedback.style.display = 'block';
// set target
var target = document.getElementById(target);
// clear html of target incase they refresh (tmp fix)
target.innerHTML = '';
// internal counter var
var counter = 0;
// image containers attach to window
var img = new Array();
// loop images
if (images.length > 0) {
for (var i in images) {
// new image object
img[i] = new Image();
// when ready peform certain actions.
img[i].onload = (function (value) {
// append to container
target.appendChild(img[value]);
// hide all images apart from the first image
if (value > 0) {
hide(img[value]);
}
// increment counter
++counter;
// on counter at correct value use callback!
if (counter == images.length) {
// hide feedback (loading message)
feedback.style.display = 'none';
if (callback) {
callback(); // when ready do callback!
}
}
})(i);
// give image alt name
img[i].alt = 'My Image ' + i;
// give image id
img[i].id = 'my_image_' + i
// preload src
img[i].src = images[i];
}//end loop
}//endif length
}//end preload image
It's really weird, I'm sure it should just work, but it doesn't even show my loading message. It just goes straight to the callback.. I'm sure it must be something simple, I've been busy and looking at it for ages and finding it a tad hard to narrow down.
I've been looking over stackoverflow and people have had similar problems and I've tried the solutions without much luck.
Any help would be greatly appreciated! I'll post more code if needed.
Cheers!
If I'm not totally wrong the problem is with you assignment to
// when ready peform certain actions.
img[i].onload = (function (value) {...})(i);
here you instantly call and execute the function and return undefined to the onload attribute, what can not be called when the image is loaded.
What you can do to have access to the value 'i' when the image is loaded you can try something like the following:
onload = (function(val){
var temp = val;
return function(){
i = temp;
//your code here
}
})(i);
this should store the value in temp and will return a callable function which should be able to access this value.
I did not test that if it is working and there maybe a better solution, but this one came to my mind :)
Try this for your onload callback:
img[i].onload = function(event) {
target.appendChild(this);
if (img.indexOf(this) > 0) {
hide(this);
}
// ...
};
Hope you can get it working! It's bed time for me though.
Edit: You'll probably have to do something about img.indexOf(this)... just realized you are using associative array for img. In your original code, I don't think comparing value to 0 is logical in that case, since value is a string. Perhaps you shouldn't use an associative array?

Play Audio through JS with Overlapping

I have the following JS code for a canvas based game.
var EXPLOSION = "sounds/explosion.wav";
function playSound(str, vol) {
var snd = new Audio();
snd.src = str;
snd.volume = vol;
snd.play();
}
function createExplosion() {
playSound(EXPLOSION, 0.5);
}
This works, however it sends a server request to download the sound file every time it is called. Alternatively, if I declare the Audio object beforehand:
var snd = new Audio();
snd.src = EXPLOSION;
snd.volume = 0.5;
function createExplosion() {
snd.play();
}
This works, however if the createExplosion function is called before the sound is finished playing, it does not play the sound at all. This means that only a single playthrough of the sound file is allowed at a time - and in scenarios that multiple explosions are taking place it doesn't work at all.
Is there any way to properly play an audio file multiple times overlapping with itself?
I was looking for this for ages in a tetris game i'm building and I think this solution is the best.
function playSoundMove() {
var sound = document.getElementById("move");
sound.load();
sound.play();
}
just have it loaded and ready to go.
You could just duplicate the node with cloneNode() and play() that duplicate node.
My audio element looks like this:
<audio id="knight-audio" src="knight.ogg" preload="auto"></audio>
and I have an onClick listener that does just that:
function click() {
const origAudio = document.getElementById("knight-audio");
const newAudio = origAudio.cloneNode()
newAudio.play()
}
And since the audio element isn't going to be displayed, you don't actually have to attach the node to anything.
I verified client-side and server-side that Chrome only tries to download the audio file once.
Caveats: I'm not sure about performance impacts, since this on my site this clip doesn't get played more than ~40x maximum for a page. You might have to clean up the audio nodes if you're doing something much larger than that?
Try this:
(function() {
var snds = {};
window.playSound(str,vol) {
if( !snds[str]) (snds[str] = new Audio()).src = str;
snds[str].volume = vol;
snds[str].play();
}
})();
Then the first time you call it it will fetch the sound, but every time after that it will reuse the same sound object.
EDIT: You can also preload with duplicates to allow the sound to play more than once at a time:
(function() {
var snds = {}
window.playSound = function(str,vol) {
if( !snds[str]) {
snds[str] = [new Audio()];
snds[str][0].src = str;
}
var snd = snds[str], pointer = 0;
while( snd[pointer].playing) {
pointer++;
if( pointer >= snd.length) {
snd.push(new Audio());
snd[pointer].src = str;
}
}
snd[pointer].volume = vol;
snd[pointer].play();
};
})();
Note that this will send multiple requests if you play the sound overlapping itself too much, but it should return Not Modified very quickly and will only do so if you play it more times than you have previously.
In my game i'm using preoading but after the sound is initiated (its not so smart to not preload at all or preload everything on page load, some sound hasn't played in some gameplay at all, why to load them)
const audio {};
audio.dataload = {'entity':false,'entityes':[],'n':0};
audio.dataload.ordernum = function() {
audio.dataload.n = (audio.dataload.n + 1)%10;
return audio.dataload.n;
}
audio.dataload.play = function() {
audio.dataload.entity = new Audio('/some.mp3');
for (let i = 0; i<10;i++) {
audio.dataload.entityes.push(audio.dataload.entity.cloneNode());
}
audio.dataload.entityes[audio.dataload.ordernum()].play();
}
audio.dataload.play() // plays sound and preload sounds to memory when it isn't
I've created a class that allows for layered audio. This is very similar to other answers where it creates another node with the same src, but this class will only do that if necessary. If it has created a node already that has been completed, it will replay that existing node.
Another tweak to this is that initially fetch the audio and use the URL of the blob. I do this for efficiency; so the src doesn't have to be fetched externally every single time a new node is created.
class LayeredAudio {
url;
samples = [];
constructor(src){
fetch(src)
.then(response => response.blob())
.then((blob) => {
this.url = URL.createObjectURL(blob);
this.samples[0] = new Audio(this.url);
});
}
play(){
if(!this.samples.find(e => e.paused)?.play()){
this.samples.push(new Audio(this.url))
this.samples[this.samples.length - 1].play()
}
}
}
const aud = new LayeredAudio("URL");
aud.play()
Relying more on memory than process time, we can make an array of multiple clones of the Audio and then play them by order:
function gameSnd() {
tick_wav = new Audio('sounds/tick.wav');
victory_wav = new Audio('sounds/victory.wav');
counter = 0;
ticks = [];
for (var i = 0; i<10;i++)
ticks.push(tick_wav.cloneNode());
tick = function(){
counter = (counter + 1)%10;
ticks[counter].play();
}
victory = function(){
victory_wav.play();
}
}
When I tried some of the other solutions there was some delay, but I may have found a better alternative. This will plow through a good chunk of memory if you make the audio array's length high. I doubt you will need to play the same audio more than 10 times at the same time, but if you do just make the array length longer.
var audio = new Array(10);
// The length of the audio array is how many times
// the audio can overlap
for (var i = 0; i < audio.length; i++) {
audio[i] = new Audio("your audio");
}
function PlayAudio() {
// Whenever you want to play it call this function
audio[audioIndex].play();
audioIndex++;
if(audioIndex > audio.length - 1) {
audioIndex = 0;
}
}
I have found this to be the simples way to overlap the same audio over itself
<button id="btn" onclick="clickMe()">ding</button>
<script>
function clickMe() {
const newAudio = new Audio("./ding.mp3")
newAudio.play()
}

How to display loading status with preloader and multiple images?

I am building a slideshow with a few hundred images and would like to build a nice loading bar, so the idea was to preload the images using JavaScript, then initialize the rest of the UI afterwords.
Preloading the images is not a problem, but getting the browser to update the status as things load is. I've tried a few things, but the browser will only repaint the display after it finishes.
I've even tried the script from this question, but I get the same results.
Here's what I've got so far (imgList is an array of filenames. I'm using Prototype.)
var imageBuf = []
var loadCount = 0
$('loadStatus').update("0/"+imgList.length)
function init() {
imgList.each(function(element){
imageBuf[element] = new Image()
//imageBuf[element].onload = window.setTimeout("count()",0) // gives "not implemented" error in IE
imageBuf[element].onload = function(){count()}
imageBuf[element].src = "thumbs/"+element
})
}
function count() {
loadCount++
$('loadStatus').update(loadCount+"/"+imgList.length)
}
init()
Try using the function from my answer to this question:
function incrementallyProcess(workerCallback, data, chunkSize, timeout, completionCallback) {
var itemIndex = 0;
(function() {
var remainingDataLength = (data.length - itemIndex);
var currentChunkSize = (remainingDataLength >= chunkSize) ? chunkSize : remainingDataLength;
if(itemIndex < data.length) {
while(currentChunkSize--) {
workerCallback(data[itemIndex++]);
}
setTimeout(arguments.callee, timeout);
} else if(completionCallback) {
completionCallback();
}
})();
}
// here we are using the above function to take
// a short break every time we load an image
function init() {
incrementallyProcess(function(element) {
imageBuf[element] = new Image();
imageBuf[element].onload = function(){count()};
imageBuf[element].src = "thumbs/"+element;
}, imgList, 1, 250, function() {
alert("done loading");
});
}
You may want to modify the chunk size parameter as well as the length of the timeout to get it to behave just like you want it to. I am not 100% sure this will work for you, but it is worth a try...

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