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How to submit a request for some given condition using jscript and jquery?

I have tried this code:
while (true) {
$(document).ready(function() {
setInterval(function () {
if ($("h2").text() == "Qu’est-ce qu’une année-lumière ?") {
$("#choice2").delay(200).queue(function () {
$(this).click().dequeue()
})
}
}, 10000)
}
. My aim is actually to send an answer as the page DOM is already ready if the element in the tag is verified, then i want to repeat this for as i am on that page. I tried many codes but my browser doesn't like them: it freezes... that is why i try to use an interval, but i am unable to control it yet. please i need your help...

The browser freezes because you have an infinite loop. It will just keep binding more and more ready events until the code is stopped for taking too long to run, or when the browser crashes because you have bound a zillion event handlers.
Adding the interval was the right move to make the code run more than once, but the while loop still kept it from working.
Remove the while loop, and your code will run. You don't need to dequeue a function that you queued, it will be dequeued when it runs.
$(document).ready(function() {
setInterval(function () {
if ($("h2").text() == "Qu’est-ce qu’une année-lumière ?") {
$("#choice2").delay(200).queue(function () {
$(this).click();
});
}
}, 10000);
}
The interval runs the code every 10 seconds, so there doesn't seem to be any reason to wait for 200 ms before invoking the click, though.

which one is best to repeat functions continiously either setInterval or callback function in jquery?

Actually in my project I have to reapeat few functions continiously,for that i have to use setinterval or call back.which one is the best way to repeat function either call back or setInterval.lightAnim() same kind of functions i have more than 8.If i use setInterval what will be happened and if use callback what will be happened with respect to browser.which way one is best.
1st way:Using setInterval
<script>
lightAnim();
setInterval(lightAnim,5000);
function lightAnim() {
$(".bulb1").fadeIn(1000, function() {
$(".bulb2").fadeIn(1000, function() {
$(".bulb3").fadeIn(1000, function() {
$(".bulb4").fadeIn(1000, function() {
$(".bulb5").fadeIn(1000, function() {
$(".bulb6").fadeIn(1000);
})
});
});
});
})
}
</script>
2nd way:On complete i am calling again
<script>
lightAnim();
function lightAnim() {
$(".bulb1").fadeIn(1000, function() {
$(".bulb2").fadeIn(1000, function() {
$(".bulb3").fadeIn(1000, function() {
$(".bulb4").fadeIn(1000, function() {
$(".bulb5").fadeIn(1000, function() {
$(".bulb6").fadeIn(1000);
lightAnim();
})
});
});
});
})
}
</script>

The callback is definitely the better choice.
You don't need to sum the delays manually, and don't need to maintain it when updating the code. It's much more error-prone, as your code demonstrates: six one-second delays are not 5000 milliseconds. Your first snippet would animate the first and sixth bulb simultaneously.
Also, when you are animating a single element the animations would get chained onto jQuery's animation queue. If the timers deviate (and setInterval is known to drift over longer periods), then you could easily build up a very long queue (animations are scheduled faster than they are executed) which is not good for performance.

jQuery fadeOut callback never fires

so I'm trying to create a really simple animation using jQuery but the callback for fadeOut doesn't ever happen.
Here is the code below:
var move = function(target, speed) {
$(target).delay(200).animate({bottom: "-=20"},
speed,
function() {
$(this).fadeOut(200, function() {
$(this).css("bottom", "+=20");
});
$(this).fadeIn(200);
}
);
move(target, speed);
};
move(".fa-arrow-down", 500);
I've tried several different things like checking it out in the console, setting various breakpoints (mainly right at $(this).css("bottom", "+=20");, right above this line, and right below this line).
I'm not really sure why it's not happening. Any help is appreciated and if you could please also explain what the issue actually is so I can learn too. Here's a fiddle.

You need to move the call to move(target, speed) to inside the complete function of the fadeIn.
DEMO
var move = function (target, speed) {
$(target).delay(200).animate({
bottom: "-=20"
},
speed,
function () {
$(this).fadeOut(200, function () {
$(this).css("bottom", "+=20");
});
$(this).fadeIn(200, function () {
move(target, speed);
});
});
};
move(".fa-arrow-down", 500);
But I can't take all the credit... cookie monster was first to see the recursion error. Just like he said, this works because it adds a delay to each time you call move()
As I just said, you're invoking move() immediately instead of waiting
for the callback. This means it invokes move() at a rate of frequency
equal to the time it takes to invoke .delay().animate(), but without
waiting for them to finish. In other words, move() will be invoked
tens of thousands of times even before the first .delay() is finished -- cookie monster

What is the correct way to do an infinite loop that calls a method in Jquery or Javascript?

I have a page that I want to update non stop, every few seconds.
For this, I wrote the following:
var to;
$(function () {
to = setTimeout(updateDivContent, 2000);
});
function updateDivContent() {
$('#topbox').load('/home/blabla', null);
$('#leftgraph').load('/home/blabla', null, function () {
to = setTimeout(updateDivContent, 2000);
});
};
This worked, however, it leads to what I presume is a memory leak as after around 15 minutes, the computer almost freezes up with the browser taking up all available memory and CPU.
I am guessing that the Timeout is basically stacking, but, I am not sure how to fix this. I have tried getting rid of the second timeout and putting the first one inside a while(true) loop, but, I just couldn't get it to work.
Can anyone suggest anything?

This looks fine actually. But if the first Ajax call does not finish within two seconds, it will stack, and this could (don't know for sure) cause problems.
The timeout itself does not stack, since you are initiating a new one only after the previous one finished.
Try to initiate a new timeout once both Ajax requests finished:
$.when($('#topbox').load('/home/blabla'),
$('#leftgraph').load('/home/blabla')
).then(function () {
setTimeout(updateDivContent, 2000);
});
Reference: $.when

I think it is better to use setInterval instead of setTimeOut.
See this post.

You probably want to call clearTimeout to invalidate the previous timer, like this:
clearTimeout(to);
to = setTimeout(updateDivContent, 2000);

can you this it will call ever 2 second
to = setInterval("updateDivContent", 2000);
function updateDivContent() {
$('#topbox').load('/home/blabla', null);
$('#leftgraph').load('/home/blabla', null, function () {
//to = setTimeout(updateDivContent, 2000);
});
};

Try setInterval:
var to;
$(function () {
to = setInterval(updateDivContent, 2000);
});
function updateDivContent() {
$('#topbox').load('/home/blabla', null);
$('#leftgraph').load('/home/blabla')
};

Javascript - Stop a repeating function [duplicate]

This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
How to pause a setTimeout call ?
I have a function that gets called on page load which starts off a repeating function:
setTimeout(function () {
repeat();
}, 8000)
This function calls repeat() every 8 seconds, inside this function I have a bit of ajax which updates a counter on the page. Clicking on the counter gives the user a drop down menu with a number of messages. The counter value equals the number of messages the user has. Kind of like Facebook notifications.
When clicking the drop down menu Im using jQuery to hide and show it:
$('#messages').click(function () {
$('#messagesDropDown').slideDown();
})
.mouseleave(function () {
$('#messagesDropDown').slideUp();
});
When the #messagesDropDown is visible I want to stop the repeat() function, to prevent the list of messages from updating while Im viewing the current ones.
On .mouseleave I want to start the repeat() function again.
Anyone have any ideas how I can 'STOP' a repeating function In the .click function and start it again on .mouseleave ?

setTimeout returns a ID of the timeout. You can store that value, and then use clearTimeout to stop the timeout when you want.
var timeout;
$('#messages').click(function () {
$('#messagesDropDown').slideDown(function () {
clearTimeout(timeout); // Cancel the timeout when the slideDown has completed.
});
})
.mouseleave(function () {
$('#messagesDropDown').slideUp();
clearTimeout(timeout); // Cancel incase it's still running (you can also set `timeout` to undefined when you cancel with clearTimeout, and apply some logic here (`if (timeout == undefined)` so you can leave it running rather than restarting it)
timeout = setTimeout(repeat, 8000); // Store the ID of the timeout
});
setTimeout will not set a recurring event; it will only fire once (like a delayed event). Look at setInterval (and clearInterval) instead.

You said that this code starts a repeating function:
setTimeout(function () {
repeat();
}, 8000)
Since setTimeout doesn't repeat, I assume that the repeat function itself fires off another setTimeout to call itself again after it runs (chained setTimeout calls).
If so, you have two options:
Have a control variable telling repeat whether to do its work or not. A simple boolean will do. Set the boolean when you want repeat to skip its work, and have repeat check it. This is the dead simple answer.
Have control functions for repeat, like so:
var repeatHandle = 0;
function startRepeat() {
if (!repeatHandle) {
repeatHandle = setTimeout(repeatTick, 8000);
}
}
function repeatTick() {
repeatHandle = 0;
repeat();
}
function stopRepeat() {
if (repeatHandle) {
clearTimeout(repeatHandle);
repeatHandle = 0;
}
}
...and then use them to control the repeats. Be sure to modify repeat to call startRepeat to schedule its next call rather than calling setTimeout directly.