Develop Reference

How to Monitor user idle in an applet inside a html using java script [duplicate]

Is it possible to detect "idle" time in JavaScript?
My primary use case probably would be to pre-fetch or preload content.
I define idle time as a period of user inactivity or without any CPU usage

Here is a simple script using jQuery that handles mousemove and keypress events.
If the time expires, the page reloads.
<script type="text/javascript">
var idleTime = 0;
$(document).ready(function () {
// Increment the idle time counter every minute.
var idleInterval = setInterval(timerIncrement, 60000); // 1 minute
// Zero the idle timer on mouse movement.
$(this).mousemove(function (e) {
idleTime = 0;
});
$(this).keypress(function (e) {
idleTime = 0;
});
});
function timerIncrement() {
idleTime = idleTime + 1;
if (idleTime > 19) { // 20 minutes
window.location.reload();
}
}
</script>

With vanilla JavaScript:
var inactivityTime = function () {
var time;
window.onload = resetTimer;
// DOM Events
document.onmousemove = resetTimer;
document.onkeydown = resetTimer;
function logout() {
alert("You are now logged out.")
//location.href = 'logout.html'
}
function resetTimer() {
clearTimeout(time);
time = setTimeout(logout, 3000)
// 1000 milliseconds = 1 second
}
};
And initialise the function where you need it (for example: onPageLoad).
window.onload = function() {
inactivityTime();
}
You can add more DOM events if you need to. Most used are:
document.onload = resetTimer;
document.onmousemove = resetTimer;
document.onmousedown = resetTimer; // touchscreen presses
document.ontouchstart = resetTimer;
document.onclick = resetTimer; // touchpad clicks
document.onkeydown = resetTimer; // onkeypress is deprectaed
document.addEventListener('scroll', resetTimer, true); // improved; see comments
Or register desired events using an array
window.addEventListener('load', resetTimer, true);
var events = ['mousedown', 'mousemove', 'keypress', 'scroll', 'touchstart'];
events.forEach(function(name) {
document.addEventListener(name, resetTimer, true);
});
DOM Events list: http://www.w3schools.com/jsref/dom_obj_event.asp
Remember to use window, or document according your needs. Here you can see the differences between them: What is the difference between window, screen, and document in JavaScript?
Code Updated with #frank-conijn and #daxchen improve: window.onscroll will not fire if scrolling is inside a scrollable element, because scroll events don't bubble. In window.addEventListener('scroll', resetTimer, true), the third argument tells the listener to catch the event during the capture phase instead of the bubble phase.

Improving on Equiman's (original) answer:
function idleLogout() {
var t;
window.onload = resetTimer;
window.onmousemove = resetTimer;
window.onmousedown = resetTimer; // catches touchscreen presses as well
window.ontouchstart = resetTimer; // catches touchscreen swipes as well
window.ontouchmove = resetTimer; // required by some devices
window.onclick = resetTimer; // catches touchpad clicks as well
window.onkeydown = resetTimer;
window.addEventListener('scroll', resetTimer, true); // improved; see comments
function yourFunction() {
// your function for too long inactivity goes here
// e.g. window.location.href = 'logout.php';
}
function resetTimer() {
clearTimeout(t);
t = setTimeout(yourFunction, 10000); // time is in milliseconds
}
}
idleLogout();
Apart from the improvements regarding activity detection, and the change from document to window, this script actually calls the function, rather than letting it sit idle by.
It doesn't catch zero CPU usage directly, but that is impossible, because executing a function causes CPU usage. And user inactivity eventually leads to zero CPU usage, so indirectly it does catch zero CPU usage.

I have created a small library that does this:
https://github.com/shawnmclean/Idle.js
Description:
Tiny JavaScript library to report activity of user in the browser
(away, idle, not looking at webpage, in a different tab, etc). that is independent of any
other JavaScript libraries such as jQuery.
Visual Studio users can get it from NuGet by:
Install-Package Idle.js

Here is a rough jQuery implementation of tvanfosson's idea:
$(document).ready(function(){
idleTime = 0;
//Increment the idle time counter every second.
var idleInterval = setInterval(timerIncrement, 1000);
function timerIncrement()
{
idleTime++;
if (idleTime > 2)
{
doPreload();
}
}
//Zero the idle timer on mouse movement.
$(this).mousemove(function(e){
idleTime = 0;
});
function doPreload()
{
//Preload images, etc.
}
})

Similar to Peter J's solution (with a jQuery custom event)...
// Use the jquery-idle-detect.js script below
$(window).on('idle:start', function() {
// Start your prefetch, etc. here...
});
$(window).on('idle:stop', function() {
// Stop your prefetch, etc. here...
});
File jquery-idle-detect.js
(function($, $w) {
// Expose configuration option
// Idle is triggered when no events for 2 seconds
$.idleTimeout = 2000;
// Currently in idle state
var idle = false;
// Handle to idle timer for detection
var idleTimer = null;
// Start the idle timer and bind events on load (not DOM-ready)
$w.on('load', function() {
startIdleTimer();
$w.on('focus resize mousemove keyup', startIdleTimer)
.on('blur', idleStart) // Force idle when in a different tab/window
;
]);
function startIdleTimer() {
clearTimeout(idleTimer); // Clear prior timer
if (idle) $w.trigger('idle:stop'); // If idle, send stop event
idle = false; // Not idle
var timeout = ~~$.idleTimeout; // Option to integer
if (timeout <= 100)
timeout = 100; // Minimum 100 ms
if (timeout > 300000)
timeout = 300000; // Maximum 5 minutes
idleTimer = setTimeout(idleStart, timeout); // New timer
}
function idleStart() {
if (!idle)
$w.trigger('idle:start');
idle = true;
}
}(window.jQuery, window.jQuery(window)))

You can do it more elegantly with Underscore.js and jQuery:
$('body').on("click mousemove keyup", _.debounce(function(){
// do preload here
}, 1200000)) // 20 minutes debounce

My answer was inspired by vijay's answer, but is a shorter, more general solution that I thought I'd share for anyone it might help.
(function () {
var minutes = true; // change to false if you'd rather use seconds
var interval = minutes ? 60000 : 1000;
var IDLE_TIMEOUT = 3; // 3 minutes in this example
var idleCounter = 0;
document.onmousemove = document.onkeypress = function () {
idleCounter = 0;
};
window.setInterval(function () {
if (++idleCounter >= IDLE_TIMEOUT) {
window.location.reload(); // or whatever you want to do
}
}, interval);
}());
As it currently stands, this code will execute immediately and reload your current page after 3 minutes of no mouse movement or key presses.
This utilizes plain vanilla JavaScript and an immediately-invoked function expression to handle idle timeouts in a clean and self-contained manner.

All the previous answers have an always-active mousemove handler. If the handler is jQuery, the additional processing jQuery performs can add up. Especially if the user is using a gaming mouse, as many as 500 events per second can occur.
This solution avoids handling every mousemove event. This result in a small timing error, but which you can adjust to your need.
function setIdleTimeout(millis, onIdle, onUnidle) {
var timeout = 0;
startTimer();
function startTimer() {
timeout = setTimeout(onExpires, millis);
document.addEventListener("mousemove", onActivity);
document.addEventListener("keydown", onActivity);
document.addEventListener("touchstart", onActivity);
}
function onExpires() {
timeout = 0;
onIdle();
}
function onActivity() {
if (timeout) clearTimeout(timeout);
else onUnidle();
//since the mouse is moving, we turn off our event hooks for 1 second
document.removeEventListener("mousemove", onActivity);
document.removeEventListener("keydown", onActivity);
document.removeEventListener("touchstart", onActivity);
setTimeout(startTimer, 1000);
}
}
http://jsfiddle.net/9exz43v2/

I had the same issue and I found a quite good solution.
I used jquery.idle and I only needed to do:
$(document).idle({
onIdle: function(){
alert('You did nothing for 5 seconds');
},
idle: 5000
})
See JsFiddle demo.
(Just for information: see this for back-end event tracking Leads browserload)

If you are targeting a supported browser (Chrome or Firefox as of December 2018) you can experiment with the requestIdleCallback and include the requestIdleCallback shim for unsupported browsers.

You could probably hack something together by detecting mouse movement on the body of the form and updating a global variable with the last movement time. You'd then need to have an interval timer running that periodically checks the last movement time and does something if it has been sufficiently long since the last mouse movement was detected.

I wrote a small ES6 class to detect activity and otherwise fire events on idle timeout. It covers keyboard, mouse and touch, can be activated and deactivated and has a very lean API:
const timer = new IdleTimer(() => alert('idle for 1 minute'), 1000 * 60 * 1);
timer.activate();
It does not depend on jQuery, though you might need to run it through Babel to support older browsers.
https://gist.github.com/4547ef5718fd2d31e5cdcafef0208096

(Partially inspired by the good core logic of Equiman's answer.)
sessionExpiration.js
sessionExpiration.js is lightweight yet effective and customizable. Once implemented, use in just one row:
sessionExpiration(idleMinutes, warningMinutes, logoutUrl);
Affects all tabs of the browser, not just one.
Written in pure JavaScript, with no dependencies. Fully client side.
(If so wanted.) Has warning banner and countdown clock, that is cancelled by user interaction.
Simply include the sessionExpiration.js, and call the function, with arguments [1] number of idle minutes (across all tabs) until user is logged out, [2] number of idle minutes until warning and countdown is displayed, and [3] logout url.
Put the CSS in your stylesheet. Customize it if you like. (Or skip and delete banner if you don't want it.)
If you do want the warning banner however, then you must put an empty div with ID sessExpirDiv on your page (a suggestion is putting it in the footer).
Now the user will be logged out automatically if all tabs have been inactive for the given duration.
Optional: You may provide a fourth argument (URL serverRefresh) to the function, so that a server side session timer is also refreshed when you interact with the page.
This is an example of what it looks like in action, if you don't change the CSS.

Try this code. It works perfectly.
var IDLE_TIMEOUT = 10; //seconds
var _idleSecondsCounter = 0;
document.onclick = function () {
_idleSecondsCounter = 0;
};
document.onmousemove = function () {
_idleSecondsCounter = 0;
};
document.onkeypress = function () {
_idleSecondsCounter = 0;
};
window.setInterval(CheckIdleTime, 1000);
function CheckIdleTime() {
_idleSecondsCounter++;
var oPanel = document.getElementById("SecondsUntilExpire");
if (oPanel)
oPanel.innerHTML = (IDLE_TIMEOUT - _idleSecondsCounter) + "";
if (_idleSecondsCounter >= IDLE_TIMEOUT) {
alert("Time expired!");
document.location.href = "SessionExpired.aspx";
}
}

<script type="text/javascript">
var idleTime = 0;
$(document).ready(function () {
//Increment the idle time counter every minute.
idleInterval = setInterval(timerIncrement, 60000); // 1 minute
//Zero the idle timer on mouse movement.
$('body').mousemove(function (e) {
//alert("mouse moved" + idleTime);
idleTime = 0;
});
$('body').keypress(function (e) {
//alert("keypressed" + idleTime);
idleTime = 0;
});
$('body').click(function() {
//alert("mouse moved" + idleTime);
idleTime = 0;
});
});
function timerIncrement() {
idleTime = idleTime + 1;
if (idleTime > 10) { // 10 minutes
window.location.assign("http://www.google.com");
}
}
</script>
I think this jQuery code is perfect one, though copied and modified from above answers!!
Do not forgot to include the jQuery library in your file!

Pure JavaScript with a properly set reset time and bindings via addEventListener:
(function() {
var t,
timeout = 5000;
function resetTimer() {
console.log("reset: " + new Date().toLocaleString());
if (t) {
window.clearTimeout(t);
}
t = window.setTimeout(logout, timeout);
}
function logout() {
console.log("done: " + new Date().toLocaleString());
}
resetTimer();
//And bind the events to call `resetTimer()`
["click", "mousemove", "keypress"].forEach(function(name) {
console.log(name);
document.addEventListener(name, resetTimer);
});
}());

The problem with all these solutions, although correct, is they are impractical, when taking into account the session timeout valuable set, using PHP, .NET or in the Application.cfc file for ColdFusion developers.
The time set by the above solution needs to sync with the server-side session timeout. If the two do not sync, you can run into problems that will just frustrate and confuse your users.
For example, the server side session timeout might be set to 60 minutes, but the user may believe that he/she is safe, because the JavaScript idle time capture has increased the total amount of time a user can spend on a single page. The user may have spent time filling in a long form, and then goes to submit it. The session timeout might kick in before the form submission is processed.
I tend to just give my users 180 minutes, and then use JavaScript to automatically log the user out. Essentially, using some of the code above, to create a simple timer, but without the capturing mouse event part.
In this way my client side and server-side time syncs perfectly. There is no confusion, if you show the time to the user in your UI, as it reduces. Each time a new page is accessed in the CMS, the server side session and JavaScript timer are reset. Simple and elegant. If a user stays on a single page for more than 180 minutes, I figure there is something wrong with the page, in the first place.

You can use the below mentioned solution
var idleTime;
$(document).ready(function () {
reloadPage();
$('html').bind('mousemove click mouseup mousedown keydown keypress keyup submit change mouseenter scroll resize dblclick', function () {
clearTimeout(idleTime);
reloadPage();
});
});
function reloadPage() {
clearTimeout(idleTime);
idleTime = setTimeout(function () {
location.reload();
}, 3000);
}

I wrote a simple jQuery plugin that will do what you are looking for.
https://github.com/afklondon/jquery.inactivity
$(document).inactivity( {
interval: 1000, // the timeout until the inactivity event fire [default: 3000]
mouse: true, // listen for mouse inactivity [default: true]
keyboard: false, // listen for keyboard inactivity [default: true]
touch: false, // listen for touch inactivity [default: true]
customEvents: "customEventName", // listen for custom events [default: ""]
triggerAll: true, // if set to false only the first "activity" event will be fired [default: false]
});
The script will listen for mouse, keyboard, touch and other custom events inactivity (idle) and fire global "activity" and "inactivity" events.

I have tested this code working file:
var timeout = null;
var timee = '4000'; // default time for session time out.
$(document).bind('click keyup mousemove', function(event) {
if (timeout !== null) {
clearTimeout(timeout);
}
timeout = setTimeout(function() {
timeout = null;
console.log('Document Idle since '+timee+' ms');
alert("idle window");
}, timee);
});

Is it possible to have a function run every 10 seconds, and have that check a "counter" variable? If that's possible, you can have an on mouseover for the page, can you not?
If so, use the mouseover event to reset the "counter" variable. If your function is called, and the counter is above the range that you pre-determine, then do your action.

Here is the best solution I have found:
Fire Event When User is Idle
Here is the JavaScript:
idleTimer = null;
idleState = false;
idleWait = 2000;
(function ($) {
$(document).ready(function () {
$('*').bind('mousemove keydown scroll', function () {
clearTimeout(idleTimer);
if (idleState == true) {
// Reactivated event
$("body").append("<p>Welcome Back.</p>");
}
idleState = false;
idleTimer = setTimeout(function () {
// Idle Event
$("body").append("<p>You've been idle for " + idleWait/1000 + " seconds.</p>");
idleState = true; }, idleWait);
});
$("body").trigger("mousemove");
});
}) (jQuery)

I use this approach, since you don't need to constantly reset the time when an event fires. Instead, we just record the time, and this generates the idle start point.
function idle(WAIT_FOR_MINS, cb_isIdle) {
var self = this,
idle,
ms = (WAIT_FOR_MINS || 1) * 60000,
lastDigest = new Date(),
watch;
//document.onmousemove = digest;
document.onkeypress = digest;
document.onclick = digest;
function digest() {
lastDigest = new Date();
}
// 1000 milisec = 1 sec
watch = setInterval(function() {
if (new Date() - lastDigest > ms && cb_isIdel) {
clearInterval(watch);
cb_isIdle();
}
}, 1000*60);
},

Based on the inputs provided by equiman:
class _Scheduler {
timeoutIDs;
constructor() {
this.timeoutIDs = new Map();
}
addCallback = (callback, timeLapseMS, autoRemove) => {
if (!this.timeoutIDs.has(timeLapseMS + callback)) {
let timeoutID = setTimeout(callback, timeLapseMS);
this.timeoutIDs.set(timeLapseMS + callback, timeoutID);
}
if (autoRemove !== false) {
setTimeout(
this.removeIdleTimeCallback, // Remove
10000 + timeLapseMS, // 10 secs after
callback, // the callback
timeLapseMS, // is invoked.
);
}
};
removeCallback = (callback, timeLapseMS) => {
let timeoutID = this.timeoutIDs.get(timeLapseMS + callback);
if (timeoutID) {
clearTimeout(timeoutID);
this.timeoutIDs.delete(timeLapseMS + callback);
}
};
}
class _IdleTimeScheduler extends _Scheduler {
events = [
'load',
'mousedown',
'mousemove',
'keydown',
'keyup',
'input',
'scroll',
'touchstart',
'touchend',
'touchcancel',
'touchmove',
];
callbacks;
constructor() {
super();
this.events.forEach(name => {
document.addEventListener(name, this.resetTimer, true);
});
this.callbacks = new Map();
}
addIdleTimeCallback = (callback, timeLapseMS) => {
this.addCallback(callback, timeLapseMS, false);
let callbacksArr = this.callbacks.get(timeLapseMS);
if (!callbacksArr) {
this.callbacks.set(timeLapseMS, [callback]);
} else {
if (!callbacksArr.includes(callback)) {
callbacksArr.push(callback);
}
}
};
removeIdleTimeCallback = (callback, timeLapseMS) => {
this.removeCallback(callback, timeLapseMS);
let callbacksArr = this.callbacks.get(timeLapseMS);
if (callbacksArr) {
let index = callbacksArr.indexOf(callback);
if (index !== -1) {
callbacksArr.splice(index, 1);
}
}
};
resetTimer = () => {
for (let [timeLapseMS, callbacksArr] of this.callbacks) {
callbacksArr.forEach(callback => {
// Clear the previous IDs
let timeoutID = this.timeoutIDs.get(timeLapseMS + callback);
clearTimeout(timeoutID);
// Create new timeout IDs.
timeoutID = setTimeout(callback, timeLapseMS);
this.timeoutIDs.set(timeLapseMS + callback, timeoutID);
});
}
};
}
export const Scheduler = new _Scheduler();
export const IdleTimeScheduler = new _IdleTimeScheduler();

As simple as it can get, detect when the mouse moves only:
var idle = false;
document.querySelector('body').addEventListener('mousemove', function(e) {
if(idle!=false)
idle = false;
});
var idleI = setInterval(function()
{
if(idle == 'inactive')
{
return;
}
if(idle == true)
{
idleFunction();
idle = 'inactive';
return;
}
idle = true;
}, 30000); // half the expected time. Idle will trigger after 60 s in this case.
function idleFuntion()
{
console.log('user is idle');
}

Here is an AngularJS service for accomplishing in Angular.
/* Tracks now long a user has been idle. secondsIdle can be polled
at any time to know how long user has been idle. */
fuelServices.factory('idleChecker',['$interval', function($interval){
var self = {
secondsIdle: 0,
init: function(){
$(document).mousemove(function (e) {
self.secondsIdle = 0;
});
$(document).keypress(function (e) {
self.secondsIdle = 0;
});
$interval(function(){
self.secondsIdle += 1;
}, 1000)
}
}
return self;
}]);
Keep in mind this idle checker will run for all routes, so it should be initialized in .run() on load of the angular app. Then you can use idleChecker.secondsIdle inside each route.
myApp.run(['idleChecker',function(idleChecker){
idleChecker.init();
}]);

Surely you want to know about window.requestIdleCallback(), which queues a function to be called during a browser's idle periods.
You can see an elegant usage of this API in the Quicklink repo.
const requestIdleCallback = window.requestIdleCallback ||
function (cb) {
const start = Date.now();
return setTimeout(function () {
cb({
didTimeout: false,
timeRemaining: function () {
return Math.max(0, 50 - (Date.now() - start));
},
});
}, 1);
};
The meaning of the code above is: if the browser supports requestIdleCallback (check the compatibility), uses it. If is not supported, uses a setTimeout(()=> {}, 1) as fallback, which should queue the function to be called at the end of the event loop.
Then you can use it like this:
requestIdleCallback(() => {...}, {
timeout: 2000
});
The second parameter is optional, you might want to set a timeout if you want to make sure the function is executed.

You could probably detect inactivity on your web page using the mousemove tricks listed, but that won't tell you that the user isn't on another page in another window or tab, or that the user is in Word or Photoshop, or WoW and just isn't looking at your page at this time.
Generally, I'd just do the prefetch and rely on the client's multi-tasking. If you really need this functionality, you do something with an ActiveX control in Windows, but it's ugly at best.

Debounce is actually a great idea! Here is a version for jQuery-free projects:
const derivedLogout = createDerivedLogout(30);
derivedLogout(); // It could happen that the user is too idle)
window.addEventListener('click', derivedLogout, false);
window.addEventListener('mousemove', derivedLogout, false);
window.addEventListener('keyup', derivedLogout, false);
function createDerivedLogout (sessionTimeoutInMinutes) {
return _.debounce( () => {
window.location = this.logoutUrl;
}, sessionTimeoutInMinutes * 60 * 1000 )
}

Why does setInterval() stop too early in this code?

<div class="wait">Wait</div>
<div class="waitDownloadLink"></div>
$(document).ready(function()
{
var secondNormal = 40;
var refreshIntervalId;
refreshIntervalId = setInterval(function() {
secondNormal -= 1;
$(".wait").text(secondNormal);
}, 1000);
setTimeout(function() {
clearInterval(refreshIntervalId);
$(".waitDownloadLink").text("Click me to download");
}, secondNormal * 1000);
});
When I start running the code and stay on the webpage, the code seems too work perfectly (or nearly). However, when I surf on other webpage right after I started the code, the timer is stuck between 12 - 18 second and then stops running. Why does this happen? And is there any solution to solve this?
https://jsfiddle.net/s1zf18co/

Browsers typically pause or reduce thread priority for Javascript running in tabs that aren't visible. My guess is that it's a power saving measure for laptops and other things, but they all have done this for years now. This question has an incredibly thorough investigation into the issue.
The solution is to use web workers which don't get paused. See the Mozilla documentation for more information.

I cannot seem to replicate the bug, however I believe that using the Date object may fix it:
var getDateTimeInSeconds = function() {
return Math.floor(Date.now() / 1000)
};
$(document).ready(function() {
var numOfSeconds = 40;
var countFrom = getDateTimeInSeconds();
var countTo = countFrom + numOfSeconds;
var refreshIntervalId = setInterval(function() {
var secondsLeft = countTo - getDateTimeInSeconds();
if (secondsLeft < 0) {
$(".wait").text(0);
$(".waitDownloadLink").text("Click me to download");
clearInterval(refreshIntervalId);
} else {
$(".wait").text(secondsLeft);
}
}, 1000);
});
Fiddle: https://jsfiddle.net/s1zf18co/1/

there is one working solution, try this and c if it is good enough, it is ok with leaving page problem, edit on end condition.
$(document).ready(function () {
var secondNormal = 40;
var refreshIntervalId = setInterval(function () {
setTimeout(function () {
if(secondNormal >0) {
secondNormal -= 1;
}
}, 1000)
$(".wait").text(secondNormal);
}, 1000);
});

Aside from Mordred's answer, in this case you may try using JS Date object to correctly estimate time. Check out this question.

build slider using jquery & javascript

I built slider using jquery but it is very stupid. You can see it:
http://jsfiddle.net/Bf2Mv/
i think the problem is here:
$(".img img").fadeOut().attr("src", images[count % images.length]).fadeIn();
$(".text").fadeOut().html(text[textcount % text.length]).fadeIn();
how to fix the effects?
thanks a lot!

You probably wanted something like this:
JSFiddle: http://jsfiddle.net/TrueBlueAussie/Bf2Mv/7/
count = 0,
text = [
"first img desc",
"2nd img desc",
"3rd img desc"],
imageCount = images.length,
rand = 6000;
function slide() {
changeImage(1)
rand = 6000;
}
function changeImage(delta) {
count += delta;
if (count < 0) count = imageCount - 1;
count %= imageCount;
$(".img img").fadeOut(function () {
$(this).attr("src", images[count]).fadeIn()
});
$(".text").fadeOut(function () {
$(this).html(text[count]).fadeIn();
});
}
(function loop() {
setTimeout(function () {
slide();
loop();
}, rand);
}());
$("#next").click(function () {
changeImage(1);
});
$("#prev").click(function () {
changeImage(-1);
});
Notes:
You only need a single counter if the images and text arrays are the same length.
You did not need to have modulus operators everywhere if the indexes are managed correctly (between 0 and length-1)
You need to correctly wrap around from 0 to length-1 and back the other way.
You need to change the images after they fadeout (hence the new callbacks in fadeout)
I refactored the change code, so it just takes a direction delta value. That way the same code can be reused by the timer, the next and the prev options.

The problem was on how the fadein/fadeout was defined. You need to use the jQuery fadein/fadeout finished parameter function.
$(".img img").stop().fadeOut('fast', function() {
var that = $(this);
that.attr("src", images[count]).fadeIn('fast', function() {
if (!LOOP_INTERVAL) {
startLoop(); // Continue the loop.
}
});
});
There were also some other issues on the indexes. Here's the solution: http://jsfiddle.net/Bf2Mv/45/
I hope this is what you meant. If you have questions about the answer, feel free to ask!

Can't get javascript text effect to work properly with delay

I'm trying to make a random text effect kinda like the one at the end of the movie War Games (Matthew Broderick). The idea is to have individual letters change randomly when ever the user hovers over one of the letters in the word. Eventually after a short time the letter would end up being "decoded" meaning that it would end up on the right letter or number. I have built basic effect but the part I am struggling with is setting the timer. I want to create a small delay between the hover-out event and the actual display of the decoded character. When i add a settimeout however. The script breaks and seems to stack timers. I'm not sure what I'm doing wrong. Below is the code I've got so far.. any help would be great.
function setDecodedChar(object){
var decodedMessage = "HELLO WORLD";
var index = object.attr('class').substring(4);
console.log(index);
object.html(decodedMessage[index]);
}
function changeChar(object){
var randomchar = getrandomChar();
object.html(randomchar);
}
function getrandomChar(){
var char = "";
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
char = possible.charAt(Math.floor(Math.random() * possible.length));
return char;
}
$(function() {
typesetting.letters('.title-text');
var target = $(".title-text").children();
console.log(target);
var timer;
var gate = true;
$(target).hover(function(){
var charChar = $(this);
//on hover-over
if(gate){
gate = false;
timer=setInterval(function(){
changeChar(charChar);
},100);
}
},function(){
//on hover-out
setTimeout(function(){ //<-- breaks here
clearInterval(timer)
setDecodedChar($(this));
},1000);
gate = true;
}
);
});
Here is a jsfiddle of the effect as I currently have it working. http://jsfiddle.net/thesnooker/htsS3/

I really like your idea, and I worked on it. I got it working.
First, here a fiddle : http://jsfiddle.net/htsS3/2/
I must say, i don't know if its the optimal way, but it still working!
The problem with you method is that you have 1 timer for every character, they override themselves, so some letters wont stop.
How i solve it:
I set the timer in the data of every letter like that :
$(this).data('timer', setInterval(function () {
changeChar(charChar);
}, 100));
Not every span have their own timer.
On hover out, i ad to save the $(this) reference into a `var since you lost it in the timeout. I alos saved the timeout into the data so i could stop it when you hover it and it's still changing. Well it look like that now :
var $this = $(this);
$this.data('timeout', setTimeout(function(){
clearInterval($this.data('timer'));
setDecodedChar($this);
},1000))
And finally, on hover, i had to clear timeout and interval:
clearInterval($(this).data('timer'));
clearTimeout($(this).data('timeout'));
Well, I find it hard to explain in my own word, so take a good look at the code and enjoy!

setsetTimeout(function(){ //<-- breaks here
clearInterval(timer)
setDecodedChar($(this));
},1000);
You have an extra 'set'
setTimeout(function(){ //<-- breaks here
clearInterval(timer)
setDecodedChar($(this));
},1000);

So the issue could be related to the timer. It changes every time the setInterval is called. If you were to store the interval on the hover object then clear it by using the stored reference it works.
Cool concept by the way.
$(function () {
var target = $(".text").children();
var timer;
$(target).hover(function () {
var charChar = $(this);
if($(this).data("timer") == void(0)) {
if($(this).data("timeout") != void(0)) {
clearTimeout($(this).data("timeout"));
}
$(this).data("timer", setInterval(function () {
changeChar(charChar);
}, 100));
}
}, function () {
//on hover-out
var timerObject = $(this);
timerObject.data("timeout", setTimeout(function() {
clearInterval(timerObject.data("timer"));
setDecodedChar(timerObject);
timerObject.removeData("timer");
}, 1000));
});

Multiple Timers in Quiz with jQuery

I'm on a quiz, where you can pick an answer out of four answer possibilities (like who wants to be a millionaire). I want to add a counter of 7secs per question to it, if the counter ends, a button to the next question should appear.
I already have my basic code with jQuiz, but my problem is now, that I use always the same counter instance. So the timer of the first question is fine, but if you answer the next question and have some time left of the first one, both counters are displayed at the same time. I think my problem will be solved when I have multiple timer instances, but I don't know how to do this.
Here my code. Sorry about the bad structure, I'm a jQuery newbie.
$('.btn, .nxt').click(function(){
$(this).addClass("checked");
next(this);
var el = $('#progress');
el.width(el.width() + 116 + 'px');
});
function next(elem){
$(elem).parents('.questionContainer').fadeOut(300, function(){
var interval = window.setInterval(function() {
var counter = 0;
clearInterval(interval);
});
var counter = 0;
timer();
$(elem).parents('.questionContainer').next().fadeIn(300);
$('.nxt').hide();
});
};
function timer(){
var counter = 7;
var interval = window.setInterval(function() {
counter--;
$(".counter").html(counter);
if (counter == 0) {
$(".counter").html('');
$('.nxt').show();
clearInterval(interval);
}
}, 1000);
};​

I'm new at Stackoverflow and it's too hard for me to edit code in this textarea... Added fixed JS to jsfiddle.
Try to add your HTML to the same fiddle and test JS, hope it would work.
There are some fixes about structure (caching selections mostly) and added array for timers (with comments) you were asking for.
It'll be easier to debug when you add HTML :)
var quizObj = {
quizTimers: [], //timers array
$counter: $(".counter"),
$buttons: $('.btn, .nxt'),
$progress: $('#progress'),
next: function(elem){
$(elem).parents('.questionContainer').fadeOut(300, function(){
//clears the FIRST timer id in the timers array and removes it from array
clearInterval(quizObj.quizTimers.shift());
quizObj.timer();
$(elem).parents('.questionContainer').next().fadeIn(300);
$('.nxt').hide();
});
},
timer: function() {
var counter = 7;
var interval = window.setInterval(function() {
counter--;
$(".counter").html(counter);
if (counter == 0) {
$(".counter").html('');
$('.nxt').show();
clearInterval(interval);
}
}, 1000);
quizObj.quizTimers.push(interval);
}
}
quizObj.$buttons.click(function(){
$(this).addClass("checked");
quizObj.next(this);
quizObj.$progress.width(quizObj.$progress.width() + 116 + 'px');
});