Develop Reference

How do I stop JavaScript timer when out of view?

Have a slider in website header that uses JavaScript and Jquery to change its tabs every 6 seconds or when the user clicks one of its tabs. I use it in my project in Webflow (a page builder) and the problem I face is that whenever slide changes, currently focused form window loses focus.
I'm no programmer even though I'm learning js now, but if after some investigation I think that the .w--current class is used both for slider and form focus in Webflow's master js file.
Here is my live project:
https://bauserwis-com-pl.webflow.io/
I found some solutions that use IntersectionObserver API to tell if the header is in viewport and stop the setInterval timer, but I struggle with integrating it with my code. Or perhaps is there a different solution? I don't mind slides changing in the background, I only want to stop the form from losing focus.
Thanks in advance.
var tabTimeout;
clearTimeout(tabTimeout);
tabLoop();
// Cycle through all tabs.
function tabLoop() {
tabTimeout = setTimeout(function() {
var $next = $('.tabs-menu').children('.w--current:first').next();
if($next.length) {
$next.click(); // user click resets timeout
} else {
$('.standard-tab:first').click();
}
}, 6000); // 6 second tab loop (change this)
}
// Reset loop if a tab is clicked
$('.standard-tab').click(function() {
clearTimeout(tabTimeout);
tabLoop();
});
});

Run jquery animated gif on form next button

I have a form that has multiple pages, on one of the page I’m using a web service to return a value (triggered on the next button) that is then displayed on the next page.
The value return takes over 20 second and want to use an animated gif to let the user know something is happening, I am using a jquery page animation that is normally fired using
$(window).load(function() {
// Animate loader off screen
$(".se-pre-con").fadeOut("slow");;
});
I have tried $(window).unload(function() nut this seems to fire straight away andnever leaves the animation.
Ideally I would like to fire the animation on the next button:
Next
And run while the web service is getting the information but npo sure hope this is done.
I have tried
$(document).ready(function () {
$('.button').on('click', getAn);
});
function getAn () {
$(".se-pre-con").fadeOut("slow");;
});
But this doesn’t fire. I also don't have acess to modify the html.
Is it possible to use an animated gif like this or is it really only for page loading?

Stop auto tab switching in javascript on click

I found this article helpful for what I was needing to do, which was have a slideshow of sorts with a tab and tab_container using JavaScript. The code works great:
Automatic tab switch in javascript or jquery
However, what I want it to do is if you let the page run, it keeps rotating between the tabs. But if a tab is manually clicked on (example, they want to read the content on that tab) it stops the auto-rotation of the tabs for the duration of while they are on that webpage. If the page is refreshed, or they go back to the page, it starts the tab rotation again.
I'm not sure the Javascript code that I can add to the above example to make the auto-rotation stop.
Thanks in advance for the help!

You can use clearInterval to stop the setInterval function from running. setInterval returns an ID and you can pass that ID to clearInterval to stop it, e.g.
var intervalID = setInterval(function() {
....
clearInterval(intervalID);
So just make the code
var intervalID = setInterval(function() {
....
tabs.on('click', 'a', function(e) {
clearInterval(intervalID);
$(this).trigger('slides.swap');
e.preventDefault();
});
I'd also change the setInterval function from triggering a click to just straight-up triggering slides.swap, so that you know the difference between a triggered click and a user's click:
$('a:eq('+idx+')').trigger('slides.swap');
Here's the updated Fiddle from that question.

jQuery Mobile Binding Spinner To ChangePage

After a lot of google'ing and reading forums I've not found a suitable answer.
So far all I have found is something like below:
show loading message
call change page
hide loading message
This would work but I would have to do this every time I call load/change page (which is a lot).
Which would leave me either to make a middle man function like below:
function customLoader(url){
showLoader();
$.mobile.changePage(url);
hideLoader();
}
Is there anyway of binding it to the change page event?
So that it shows from the second changePage is called but hides once changePage is away...
I know the above middle man method would work but would like something more tidy and nicer to implement as there's a lot of html/js files.

Something like this:
$('#index').live('pagebeforeshow',function(e,data){
$('#test-button').live('click', function(e) {
$.mobile.showPageLoadingMsg(true);
setTimeout(function () {
$.mobile.changePage('#second');
}, 1000);
});
});
$("#second").live('pageshow', function () {
$.mobile.hidePageLoadingMsg();
});
Timeout is here only so you can see it's working successfully. This is a light example so transition is fired quickly. Remove it in your real code.
And here's an example: http://jsfiddle.net/Gajotres/arrHd/
Every change page event cycle has a order of events occuring when a page A is transiting to a page B. No matter which action is used to trigger a change page you can always disable it when page B i successfully loaded. If you want to find more about page load order take a look at this link: https://stackoverflow.com/a/14010308/1848600. There you will find a lot about jQM page dynamics.
In case you want to implement this into every page transition use this:
$('[data-role="page"]').live('pageshow', function () {
$.mobile.hidePageLoadingMsg();
});
This will hide a ajax loader (if it is open) every time a different page is successfully loaded and shown.

Maybe it's too much for many, but I found a solution different than the written in the comments of this question.
I use the jquery mobile router and in the 'show' event of a page, I do $.mobile.loading("show");, so when the page appears it does with the loading spinner showing.
I use Jquery Mobile Router for a lot more, but it solved this issue.
Though to hide the spinner, I had to use $('.ui-loader').hide();, which is weird, I know...
(Maybe just listening to the proper event and triggering the spinner would also work, as this is what JQMR does...)
I'm using JQM 1.4.2...

setInterval 'stacks' when Chrome tab is not shown

Looking at other questions here they seem to report setInterval is disabled or slowed down when a tab is hidden. I am seeing a different problem - calls to setInterval appear to "stack" and then all get applied when the tab is shown.
In my case I have a slider which animates an image on the site homepage every few seconds. If I go to another tab for a minute or two then return, the slider goes crazy... all the animations fire one after another until it is caught up.
I tried adding code to stop the animation happening if another is already in progress, but it doesn't work... maybe the timer events get queued in some way that circumvents my test.
setInterval(function(){
if (!rotationQueued) {
rotationQueued = true;
rotate_slide('next');
}
}
So, I want the JS to pause when the tab is hidden - or to act as normal - anything but this!!

You could try something like this:
function runRotate() {
return window.setInterval(function(){
if (!rotationQueued) {
rotationQueued = true;
rotate_slide('next');
}
});
}
var run = runRotate();
window.addEventListener('focus', function() {
run = runRotate();
},false);
window.addEventListener('blur', function() {
window.clearInterval(run);
},false);
You would basically look to see if the browser window is focused or not and then run or disable the setInterval function depending on the event returned.