There is a function which sets an interval using setInterval(), but even after calling clearInterval(), I can see in the console that the else condition is still running. How can I clear that interval properly?
function increase(old, step, neu) {
var i = 0;
var delay2;
function countUp() {
if (i < 5) {
old += step;
// console.log("increase")
$("#total-price-value").text(old + " dollors");
$("#total-price-value").digits();
i++;
delay2 = setInterval(countUp, 80);
} else {
clearInterval(delay2);
console.log(delay2);
}
}
countUp();
}
It looks like you're a little confused about the difference between timeouts and intervals. Timeouts fire only once; intervals fire many times. If you're using an interval, you probably only want to set it once (you're setting it every time). If you're using a timeout, you probably want to set it every time (like you're doing).
In order to fix the problem, you'll either want to switch to timeouts (probably the easiest; just a search/replace) or only set the interval once.
For example, here is how one might use setTimeout to count up to five:
var count = 0;
function timeoutFired() {
count++;
if(count < 5) {
setTimeout(timeoutFired, 1000);
}
}
setTimeout(timeoutFired, 1000);
Using timeouts, we don't need to clear to stop it from counting; simply not setting a timeout will prevent it from running again.
Here is how one might use setInterval:
var count = 0;
function intervalFired() {
count++;
if(count >= 5) {
clearInterval(interval);
}
}
var interval = setInterval(intervalFired, 1000);
If you want some code running periodically using intervals to stop, you must call clearInterval. Note that we only call setInterval once, versus setTimeout every time we didn't want it to continue.
Apparently, you have mistaken setInterval for setTimeout. setInterval runs the enclosed function every n milliseconds while setTimeout executes only once after n milliseconds.
I suppose you wanted to "tick until 5" so here's a sample:
function increase(old, step, neu) {
var i = 0;
interval = setInterval(function() {
if (i < 5) {
//do something at this "tick"
console.log(i);
i++;
} else {
//else, stop
clearInterval(interval);
}
},80);
}
increase();
Related
Why is it that the counter only shows final number vs seeing each number 1 by 1.
What needs to be done to accomplish this?
var counter = 100;
function countdown() {
while(counter < 1000) {
counter++;
console.log(counter);
document.getElementById('cc').innerHTML = counter;
}
}
countdown();
setInterval(countdown, 1000);
This problem is happening because the Javascript execution and page rendering are actually occurring in the same execution thread. This means that while the code is executing the browser will not be redrawing the page because running JavaScript blocks the updating of the DOM like in your example.
To solve this you can use the setTimeout() which allows you to specify a function that will be executed once after a set number of milliseconds. Now, there will be gaps in between the code execution in which the browser will get the chance to redraw the page. now, when you actually pass 0 as the the delay argument. it will schedule the callback to be run asynchronously, after the shortest possible delay - which will be around after JavaScript thread of execution is not busy (the callback function will be waiting in the callback queue to be pulled by the event loop to be handled after a really short time)
function count() {
var counter = 100;
var max = 1000;
function timeoutLoop() {
document.getElementById('cc').innerHTML = counter;
if (++counter < max){
setTimeout(timeoutLoop, 0);
}
}
setTimeout(timeoutLoop, 0);
}
count();
<div id="cc">
</div>
More about the event loop - https://developer.mozilla.org/en-US/docs/Web/JavaScript/EventLoop
Great article about browser rendering - https://developpaper.com/the-process-of-browser-rendering-web-pages/
It's because you were using a while loop, instead use an if statement to check whether the counter has reached 1000. See below:
var counter = 100;
function countdown() {
if(counter < 1000) {
counter++;
console.log(counter);
document.getElementById('cc').innerHTML = counter;
}
}
countdown();
setInterval(countdown, 1000);
<div id="cc"></div>
You are not giving the browser time to breathe
Also why have a loop when setInterval loops?
And you want to count down. not up I guess
Also we want to stop the counting
Lastly we can save a bracket
let counter = 10; // 10 to show it works
let tId;
const cc = document.getElementById('cc');
function countdown() {
if (counter === 0) {
cc.innerHTML = "DONE!";
clearInterval(tId); // stop
return
}
// console.log(counter);
cc.innerHTML = counter;
counter--;
}
countdown();
tId = setInterval(countdown, 1000);
<span id="cc"></span>
I'm working on some code that'd I'd like to have each loop run every 60 seconds, but currently each loop runs immediately. The purpose of the code it to see if a form has changed, and if it has save the form. Do I have setInterval setup incorrectly?
function saveHelper(formId) {
for(var i = 0; i < 4; i++) {
save(formId);
}
}
function save(formId) {
console.log('might save');
var changed = formChanges(formId);
var intId = setInterval(stall, 60000);
if(changed.length > 0) {
console.log('would save');
//document.getElementById(formId).submit();
}
clearInterval(intId);
}
function stall() {
return true;
}
You are treating interval as some sort of synchronous sleep method, which is not the case. The change code should be inside of the setInterval, it should not live after the interval.
var intId = setInterval(function () {
if(changed.length > 0) {
console.log('would save');
//document.getElementById(formId).submit();
}
}, 60000);
setInterval doesn't pause your code, it just schedules some code to be run some time in the future. For example, when you do this:
var intId = setInterval(stall, 60000);
That says "every 60000 milliseconds, run the function stall". As soon as this line of code completes, it will immediately run your next line of code, do the saving, then clear the interval. Clearing the interval cancels it, so now nothing will happen in 60000 milliseconds.
Instead, you'll want to do something like this:
function saveHelper(formId) {
let count = 0;
const intId = setInterval(function () {
if(changed.length > 0) {
console.log('would save');
//document.getElementById(formId).submit();
}
count++;
if (count === 4) {
clearInterval(intId);
}
}, 60000);
}
Every 60000 milliseconds, the inner function will run, and do the saving. After saving, it checks how many times we've done this, and once it reaches 4, it clears the interval to stop it from happening any more.
I want the animation to stop when the number of clicks reach certain number.
Why the first snippet works, and the second one doesn't.
The only difference is where clearInterval is called.
This one works --- stops the animation.
var intervalId = setInterval(moveHeading, intervalLength);
var intervalLength = 120;
var clicks = 0;
$("#heading").click(function () {
clearInterval(intervalId);
clicks++;
intervalLength /= 2;
if (clicks >= 3) {
$("#heading").text("You Win!");
} else {
$("#heading").text(clicks);
intervalId = setInterval(moveHeading, intervalLength);
}
});
However this one one won't work --- doesn't stop animation.
var intervalId = setInterval(moveHeading, intervalLength);
var intervalLength = 120;
var clicks = 0;
$("#heading").click(function () {
clicks++;
intervalLength /= 2;
if (clicks > 3) {
clearInterval(intervalId);
$("#heading").text("You Win!");
} else {
$("#heading").text(clicks);
intervalId = setInterval(moveHeading, intervalLength);
}
});
On the first one, you clearInterval, then overwrite intervalId when you call setInterval, so you will never have a setInterval that is still running, where you no longer know the intervalId.
On the second one, if clicks <= 3, then you will overwrite intervalId, but you never cleared the running setInterval, so it will continue to run, and you will never be able to clearInterval on it since you don't know it's id (you will just be able to clear the interval for whatever new interval you created).
The setInterval() method will execute the function once every 1 second, just like a digital watch.
we have to use clearInterval() to stop the time.
It clears a timer set with the setInterval() method.
You must have to use it, in order to stop your animations.
I want a counter which reset in specific interval of time. I wrote this code. When I refresh the page it is executing perfectly. But as time passes the timer goes really fast, skipping seconds. Any idea why this is happening.
function countdown_new() {
window.setInterval(function () {
var timeCounter = $("b[id=show-time]").html();
var updateTime = eval(timeCounter) - eval(1);
$("b[id=show-time]").html(updateTime);
if (updateTime == 0) {
//window.location = ("ajax_chart.php");
$("b[id=show-time]").html(5);
clearInterval(countdown_new());
// countdown_new();
//my_ajax();
}
}, 1000);
}
window.setInterval(function () {
countdown_new();
}, 5000)
HTML
Coundown in 5 seconds
The issue is because you are not clearing the previous timer before starting a new one, so you start a new one for each iteration. To clear the timer you should save a reference to it, and pass that to clearInterval, not a function reference.
Also, note that your pattern of using multiple intervals for different operations can lead to overlap (where two intervals are acting at the same time and cause odd behaviour). Instead, use setTimeout for the initial 5 second delay and then chain further calls to stop this overlap.
Try this:
var timer;
function countdown_new() {
timer = setInterval(function () {
var $showTime = $("#show-time")
var updateTime = parseInt($showTime.text(), 10) - 1;
$showTime.html(updateTime);
if (updateTime == 0) {
$showTime.html('5');
clearInterval(timer);
setTimeout(countdown_new, 5000);
}
}, 1000);
}
setTimeout(countdown_new, 5000);
Example fiddle
Note that you should use the # selector to select an element by its id attribute, and you should never use eval - especially not for type coercion. To convert a value to an integer use parseInt().
You are calling window.setInterval(), which schedules a function call to countdown_new() ever 5 seconds without stop.
Compounding the problem, you are calling countdown_new() again inside your clear interval.
You need to call setInterval just once to continuously execute a function every 5 seconds.
If you want to cancel an interval timer, you need do to this:
var intervalObj = setInterval(function() { ... }, 5000);
clearInterval(intervalObj);
Yes clearinterval does the trick.
function countdown_new(){
t = window.setInterval(function() {
var timeCounter = $("b[id=show-time]").html();
var updateTime = eval(timeCounter)- eval(1);
$("b[id=show-time]").html(updateTime);
if(updateTime == 0){
//window.location = ("ajax_chart.php");
$("b[id=show-time]").html(5);
clearInterval(t);
// countdown_new();
my_ajax();
}
}, 1000);
}
What I want is an infinite loop that alerts 1, 2, 3, 1, 2, 3, ... with an interval of 2000 milliseconds. But it's not working. The console's not showing any error though. What's the problem here?
for (i = 1; i <= 3; i++) {
setInterval(function() {
alert(i);
}, 2000);
if (i == 3) {
i = 0;
}
}
This will do:
var i = 0;
setInterval(function () {
i += 1;
if (i == 4) {
i = 1;
}
alert(i);
}, 2000);
I've checked it chrome too.
It outputs 1,2,3,1,2,3... as you have requested.
you can not setInterval() inside a for loop because it will create multiple timer instance.
The setInterval() method calls a function or evaluates an expression at specified intervals (in milliseconds).
The setInterval() method will continue calling the function until clearInterval() is called, or the window is closed.
The ID value returned by setInterval() is used as the parameter for the clearInterval() method.
Tip: To execute a function only once, after a specified number of milliseconds, use the setTimeout() method.
var i = 0
function test() {
i = i % 3;
++i;
alert(i);
};
setInterval('test()', 2000);
You would not need a loop for this, an interval already goes on infinitley. Try this instead:
var i = 1;
setInterval(function() {
alert(i);
i++;
if(i > 3) {
i = 1;
}
}, 2000);
The reason why this is not working is because you enter the infinite loop in a blocking state, meaning that the interval is never entered as the browser is busy looping. Imagine the browser can only do one thing at a time, as in a single thread, so the loop is it, and cannot do anything else until it's done, and in your case it never is, therefore the interval is waiting for it's turn, which it never gets.
You could make it none blocking like this:
function recursion () {
for (var i = 1; i < 4; i++) {
var num = i;
setInterval(function() {
console.log(String(this));
}.bind(num), 2000);
}
recursion ();
}
recursion ();
my best suggestion is . use event monogramming righterthen loop ,
first make a function then after completing of setInterval call to next function and so on.. that's how u can solve this p