I am using setInterval(fname, 10000); to call a function every 10 seconds in JavaScript. Is it possible to stop calling it on some event?
I want the user to be able to stop the repeated refresh of data.
setInterval() returns an interval ID, which you can pass to clearInterval():
var refreshIntervalId = setInterval(fname, 10000);
/* later */
clearInterval(refreshIntervalId);
See the docs for setInterval() and clearInterval().
clearInterval. I have used window.refreshIntervalId instead of a local variable, and it works great!$('foo').data('interval', setInterval(fn, 100)); and then clearing it with clearInterval($('foo').data('interval')); I'm sure there is a non-jQuery way to do it, too.If you set the return value of setInterval to a variable, you can use clearInterval to stop it.
var myTimer = setInterval(...);
clearInterval(myTimer);
You can set a new variable and have it incremented by ++ (count up one) every time it runs, then I use a conditional statement to end it:
var intervalId = null;
var varCounter = 0;
var varName = function(){
if(varCounter <= 10) {
varCounter++;
/* your code goes here */
} else {
clearInterval(intervalId);
}
};
$(document).ready(function(){
intervalId = setInterval(varName, 10000);
});
I hope that it helps and it is right.
clearInterval(varName);. I expected clearInterval to not work when passed the function name, I thought it required the interval ID. I suppose this can only work if you have a named function, as you can't pass an anonymous function as a variable inside of itself.$(document).ready(function(){ }); is jQuery, that's why it doesn't work. This should've been mentioned at least.varName, which stores an unnamed function - wha?? You should change or take down this answer, IMHO.Already answered... But if you need a featured, re-usable timer that also supports multiple tasks on different intervals, you can use my TaskTimer (for Node and browser).
// Timer with 1000ms (1 second) base interval resolution.
const timer = new TaskTimer(1000);
// Add task(s) based on tick intervals.
timer.add({
id: 'job1', // unique id of the task
tickInterval: 5, // run every 5 ticks (5 x interval = 5000 ms)
totalRuns: 10, // run 10 times only. (omit for unlimited times)
callback(task) {
// code to be executed on each run
console.log(task.name + ' task has run ' + task.currentRuns + ' times.');
// stop the timer anytime you like
if (someCondition()) timer.stop();
// or simply remove this task if you have others
if (someCondition()) timer.remove(task.id);
}
});
// Start the timer
timer.start();
In your case, when users click for disturbing the data-refresh; you can also call timer.pause() then timer.resume() if they need to re-enable.
See more here.
setInterval returns a number:
Take this number. Pass it to the function clearInterval and you're safe:
Code:
Always store the returned number of setInterval in a variable, so that you can stop the interval later on:
const intervalID = setInterval(f, 1000);
// Some code
clearInterval(intervalID);
(Think of this number as the ID of a setInterval. Even if you have called many setInterval, you can still stop anyone of them by using the proper ID.)
In nodeJS you can you use the "this" special keyword within the setInterval function.
You can use this this keyword to clearInterval, and here is an example:
setInterval(
function clear() {
clearInterval(this)
return clear;
}()
, 1000)
When you print the value of this special keyword within the function you output a Timeout object Timeout {...}
const interval = setInterval(function() {
const checkParticlesjs = document.querySelector('.success_class') // get success_class from page
if (checkParticlesjs) { // check if success_class exist
fbq('track', 'CompleteRegistration'); // Call Facebook Event
clearInterval(interval); // Stop Interval
}
}, 2000); // repeat every 2 second
Simply add a class that tells the interval not to do anything. For example: on hover.
var i = 0;
this.setInterval(function() {
if(!$('#counter').hasClass('pauseInterval')) { //only run if it hasn't got this class 'pauseInterval'
console.log('Counting...');
$('#counter').html(i++); //just for explaining and showing
} else {
console.log('Stopped counting');
}
}, 500);
/* In this example, I'm adding a class on mouseover and remove it again on mouseleave. You can of course do pretty much whatever you like */
$('#counter').hover(function() { //mouse enter
$(this).addClass('pauseInterval');
},function() { //mouse leave
$(this).removeClass('pauseInterval');
}
);
/* Other example */
$('#pauseInterval').click(function() {
$('#counter').toggleClass('pauseInterval');
});
body {
background-color: #eee;
font-family: Calibri, Arial, sans-serif;
}
#counter {
width: 50%;
background: #ddd;
border: 2px solid #009afd;
border-radius: 5px;
padding: 5px;
text-align: center;
transition: .3s;
margin: 0 auto;
}
#counter.pauseInterval {
border-color: red;
}
<!-- you'll need jQuery for this. If you really want a vanilla version, ask -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p id="counter"> </p>
<button id="pauseInterval">Pause</button></p>
I've been looking for this fast and easy approach for ages, so I'm posting several versions to introduce as many people to it as possible.
this.setInterval(function() { if(!$('#counter').hasClass('pauseInterval')) { //do something } }, 500); is all you have for code. Moreover, the check is the first thing you do, so it's very lightweight when it's being hovered. That is what this one is for: temporarily pausing a function. If you want to terminate it indefinitely: of course you remove the interval.