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how can i go back to the beginning when there is no next()

how can i go back to the beginning when there is no next()
$(function () {
(function hideHeading() {
setInterval(function () {
$('.active').fadeOut(2000, function () {
$(this).removeClass('active').next().addClass('active').fadeIn(2000);
});
}, 2000);
})();
});
example here
http://codepen.io/OsamaElzero/pen/LVeLeY

You actually don't need setInterval since you could simply do a recursion as below. If the .next() isn't there, set the pointer to first().
$(function () {
(function hideHeading() {
$(".active").fadeOut(2000, function () {
var $this = $(this).removeClass('active');
var $next = ($this.next().length && $this.next()) || ($this.siblings().first());
$next.addClass('active').fadeIn(2000, hideHeading);
});
}());
});
Updated Pen

Check if next is an element, if not, select the first sibling.
var elem = $(this).removeClass('active')
var next = elem.next();
if(next.length===0) {
next = elem.siblings().first();
}
next.addClass('active').fadeIn(2000);

How to stop click events from queuing up on multiple click?

What I need to achieve is if we click on submit button, there is particular div should show up.
Here is my code:
http://jsfiddle.net/7tn5d/
But if I click on submit button multiple times, the function calls sort of queue up and run one after other.
Is there a way to invalidate other onclicks when current animation is running?
Code:
animating = 0;
doneanim = 0;
$(function () {
$("#submit_tab").click(function (e) {
if (animating == 1) return;
animating = 1;
$("#submit_cont").show("blind", {}, 1000);
animating = 0;
});
});

To prevent it from performing the action multiple times, simple cease the previous animation. So:
$('#submit_cont').stop().show("blind",{},1000);
However, I have noticed that you have attempted to prevent the animation from running, if an animation is already running. Although it takes 1 second or 1000 milliseconds to show the div, the execution of the condition does not pause until the animation is complete. You must define a function to run after the animation is complete, like so:
animating = 0;
doneanim = 0;
$(function () {
$("#submit_tab").click(function (e) {
if (animating == 1) return;
animating = 1;
$("#submit_cont").show("blind", 1000, function() { animation = 0; });
});
});
Hope that helped...

You almost got it right with the semaphore! It's just that, in jQuery's show(), you would have to put the semaphore reset as an argument. Here's the fixed version - http://jsfiddle.net/snikrs/xe5A3/
animating = 0;
doneanim = 0;
$(function () {
$("#submit_tab").click(function (e) {
if (animating == 1) return;
animating = 1;
$("#submit_cont").show("blind", 1000, function() {
animating = 0;
});
});
});

You can use the :animated selector to check:
$(function () {
$("#submit_tab").click(function (e) {
var $cont = $("#submit_cont");
if (!$cont.is(':animated')) {
$cont.show("blind", {}, 1000);
}
});
});
Now if you stick with the external semaphore idea then its better to stick that on the elemnt with .data() instead of using a global variable:
$(function () {
$("#submit_tab").click(function (e) {
var $cont = $('#submit_cont'),
animating = $cont.data('isAnimating');
if (animating) {
return;
} else {
$cont.data('isAnimating', 1);
$("#submit_cont").show("blind", 1000, function() { $cont.data('isAnimating', 0); });
}
});
});

Something like this (see documentation) :)
$("#submit_cont").show("blind", function(){
animating = 0;
});

You can add a $("#submit_cont").clearQueue(); after the animation finished :
$("#submit_tab").click(function (e) {
$("#submit_cont").show("blind", 1000, function() {
$("#submit_cont").clearQueue();
});
});
Updated JSFiddle

I found a different solution for this, which in my opinion looks cleaner:
var tab = $("submit_tag");
tab.on("click", function(){
var cont = $("submit_cont");
var animating = tab.queue("fx").length;
if(animating === 0){
cont.show("blind", {}, 1000);
}
});

Recursive function : where am I wrong here?

Code :
isDomLoaded = $(function () {
setTimeout(function () {
if (renderFinished) {
renderSocial(fotoProssima);
} else {
isDomLoaded();
}
}, 300);
});
it says isDomLoaded is not a function

Thats because it isn't a function. It is a jQuery object.
What you need might be:
isDomLoaded = function () {
setTimeout(function () {
if (renderFinished) {
renderSocial(fotoProssima);
} else {
isDomLoaded();
}
}, 300);
};
If you want to run it when the DOM is ready then do this after you declare the function:
$(window).load(isDomLoaded);
However, I think what you really need is to get rid of the isDomLoaded function and just use the following:
$(document).ready(function(){
renderSocial(fotoProssima);
});

function isDomLoaded(){
//code
//recursive call
isDomLoaded();
}

Stop timer on hover

I'm not a JS coder my any means. I know enough to make things do what I want, but couldn't code from scratch. My issue is:
We have a shopping cart that when you add a product the cart shows itself for 4 secs unless the customer hovers over the cart. I can't seem to get it to stop the timeout when the cursor is hovered over it.
$(document).ready(function () {
setTimeout(function () { $('#ctl00_ctl00_ctlHeader_divOrderProducts').hide(); }, 4000);
});

Store the return of setTimeout() in a variable, and use that to clearTimeout():
// t is a global scope variable.
// Probably a good idea to use something better than 't'
var t;
$(document).ready(function () {
// Store the return of setTimeout()
t = setTimeout(function () { $('#ctl00_ctl00_ctlHeader_divOrderProducts').hide(); }, 4000);
});
$('cart-selector').hover(function() {
if (t) {
// Call clearTimeout() on hover()
clearTimeout(t);
}
});

You need to set your timer to a variable:
var timer1 = setTimeout(function () { ... })
then use:
clearTimeout(timer1)

You need to save the return value of setTimeout() so you can later use it with clearTimeout(). One way to that is like this:
$(document).ready(function () {
var hideTimer = setTimeout(function () {
$('#ctl00_ctl00_ctlHeader_divOrderProducts').hide();
}, 4000);
$('#ctl00_ctl00_ctlHeader_divOrderProducts').hover(function() {
if (hideTimer) {
clearTimeout(hideTimer);
hideTimer = null;
}
});
});
If you want to re-enable the timer when the mouse leaves the cart again (assuming #ctl00_ctl00_ctlHeader_divOrderProducts is the cart), you can do so like this:
$(document).ready(function () {
var hideTimer;
function delayHideCart() {
if (!hideTimer) {
hideTimer = setTimeout(function () {
$('#ctl00_ctl00_ctlHeader_divOrderProducts').hide();
}, 4000);
}
}
delayHideCart();
$('#ctl00_ctl00_ctlHeader_divOrderProducts').hover(function() {
if (hideTimer) {
clearTimeout(hideTimer);
hideTimer = null;
}
}, function() {
delayHideCart();
});
});

This should do it:
$(document).ready(function () {
var timeout = setTimeout(function () { $('#ctl00_ctl00_ctlHeader_divOrderProducts').hide(); }, 4000);
$('#ctl00_ctl00_ctlHeader_divOrderProducts').mouseover(function() {
clearTimeout(timeout);
});
});
You save the timeout as a variable and then call clearTimeout when you mouseover the cart and pass in that timeout.

var timer = window.setTimeout(function () {
$('#ctl00_ctl00_ctlHeader_divOrderProducts').hide();
if(someCondition)clearTimeout(timer);
}

Javascript "while hovered" loop

Can anybody help me on this one...I have a button which when is hovered, triggers an action. But I'd like it to repeat it for as long as the button is hovered.
I'd appreciate any solution, be it in jquery or pure javascript - here is how my code looks at this moment (in jquery):
var scrollingposition = 0;
$('#button').hover(function(){
++scrollingposition;
$('#object').css("right", scrollingposition);
});
Now how can i put this into some kind of while loop, so that #object is moving px by px for as #button is hovered, not just when the mouse enters it?

OK... another stab at the answer:
$('myselector').each(function () {
var hovered = false;
var loop = window.setInterval(function () {
if (hovered) {
// ...
}
}, 250);
$(this).hover(
function () {
hovered = true;
},
function () {
hovered = false;
}
);
});
The 250 means the task repeats every quarter of a second. You can decrease this number to make it faster or increase it to make it slower.

Nathan's answer is a good start, but you should also use window.clearInterval when the mouse leaves the element (mouseleave event) to cancel the repeated action which was set up using setInterval(), because this way the "loop" is running only when the mouse pointer enters the element (mouseover event).
Here is a sample code:
function doSomethingRepeatedly(){
// do this repeatedly when hovering the element
}
var intervalId;
$(document).ready(function () {
$('#myelement').hover(function () {
var intervalDelay = 10;
// call doSomethingRepeatedly() function repeatedly with 10ms delay between the function calls
intervalId = setInterval(doSomethingRepeatedly, intervalDelay);
}, function () {
// cancel calling doSomethingRepeatedly() function repeatedly
clearInterval(intervalId);
});
});
I created a sample code on jsFiddle which demonstrates how to scroll the background-image of an element left-to-right and then backwards on hover with the code shown above:
http://jsfiddle.net/Sk8erPeter/HLT3J/15/

If its an animation you can "stop" an animation half way through. So it looks like you're moving something to the left so you could do:
var maxScroll = 9999;
$('#button').hover(
function(){ $('#object').animate({ "right":maxScroll+"px" }, 10000); },
function(){ $('#object').stop(); } );

var buttonHovered = false;
$('#button').hover(function () {
buttonHovered = true;
while (buttonHovered) {
...
}
},
function () {
buttonHovered = false;
});
If you want to do this for multiple objects, it might be better to make it a bit more object oriented than a global variable though.
Edit:
Think the best way of dealing with multiple objects is to put it in an .each() block:
$('myselector').each(function () {
var hovered = false;
$(this).hover(function () {
hovered = true;
while (hovered) {
...
}
},
function () {
hovered = false;
});
});
Edit2:
Or you could do it by adding a class:
$('selector').hover(function () {
$(this).addClass('hovered');
while ($(this).hasClass('hovered')) {
...
}
}, function () {
$(this).removeClass('hovered');
});

var scrollingposition = 0;
$('#button').hover(function(){
var $this = $(this);
var $obj = $("#object");
while ( $this.is(":hover") ) {
scrollingposition += 1;
$obj.css("right", scrollingposition);
}
});