Cancel timout / timer if function called again --- debounce function

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I want to create a function that starts a timeout, but if the function is called again, before the timer ends, cancel the original call and start the timer again.

I thought I could do:

function setTimer() {
   setTimeout(() => {
      // do something
   }, 3000)
} 

...but that doesn't work, for every time I run setTimer(), it doesn't cancel the original call.

Can anyone point me in the right direction?

setTimeout returns an id you can use to clear that timeout with clearTimeout(). So you can clear the existing timeout at the beginning of your function.

For example if you keep clicking it will keep restarting -- if you don't click it finishes in 2 seconds:

let timerID;

function setTimer() {
  console.log("starting/restarting timer")
  clearTimeout(timerID)
  timerID = setTimeout(() => {
    console.log("finished")
  }, 2000)
}
<p onclick="setTimer()">click to start</p>

JavaScript Debounce Function, Download this debounce JavaScript function to limit your JavaScript The function will be called after it stops being called for // N !timeout; clearTimeout(​timeout); timeout = setTimeout(later, wait); if delay milliseconds after its last invocation (the timer is reset on every call). Thanks again, this is great! Timer information for use in canceling, see `cancel`. Delay calling the target method until the debounce period has elapsed with no additional debounce calls. If debounce is called again before the specified time has elapsed, the timer is reset and the entire period must pass again before the target method is called.

What you want to do is cancel the existing timeout and start it over? You can do this by using cleartimeout

let timeoutFunctionVar = null;

const setTimeoutFunction = () => {
    clearTimeout(timeoutFunctionVar)
    timeoutFunctionVar = setTimeout(() => {
        // do something
    }, 3000)
};

setTimeoutFunction()

So every time setTimeoutFunction() gets called, the previous timeout gets reset

Debouncing and Throttling in JavaScript, In this article, we will discuss debouncing and throttling techniques that can identify the timer created by the call to setTimeout ; this value can be passed to So, if you want to cancel the execution of any setTimeout function, you can function has been executed and the user again performs the scroll,  Debouncing enforces that a function not be called again until a certain amount of time has passed without it being called. As in "execute this function only if 100 milliseconds have passed without it being called". Throttling. Throttling enforces a maximum number of times a function can be called over time. As in "execute this function at most

I figured this question gets asked frequently, especially for searches triggered by key events, but I couldn't find any.

The basic idea is that you keep the timeout id stateful, so you can clear it on subsequent invocations to the TO setter:

const MS_IN_SEC = 1000;

let old_timeout;

function TO_setter(searchString) {
    if (old_timeout)
        window.clearTimeout(old_timeout);

    old_timeout = window.setTimeout(search, 2 * MS_IN_SEC, searchString);
}

function search(s) {
    console.log('search for: %s', s);
}

clearInterval doesn't work - timer - html, If I decide to jump to a specific image, the timer is not set to 0 despite a Move it to a wider scope. var rest; function pauseImage () { clearInterval(rest); myFunctionLock = false clearTimeout(t); so that the function becomes usable again. lodash debounce not-working (I use it wrongly?), function called multiple times. However, if the debounce button is clicked once, and again clicked prior to the end of the delay, the initial delay is cleared and a fresh delay timer is started. The clearTimeout function is being used to achieve it. The general idea for debouncing is: 1. Start with 0 timeout 2. If the debounced function is called again, reset the timer to the

Cooperative asynchronous JavaScript: Timeouts and intervals , up by these functions runs on the main thread (after their specified timer has elapsed). That can be useful if you have a function that needs to be called both from a Finally, if a timeout has been created, you can cancel it before the To reset it, you'll want to set the counter back to 0 , clear the interval,  The throttled function will be called 4 times because throttling guarantees the callback will only be invoked at most once every delay milliseconds. However the debounced function will only be called a single time, because it resets its internal timer on every call, and so executes 250ms (the supplied delay) after the last call (1 second in)

Debouncing in JavaScript, The clearTimeout function is being used to achieve it. The general 0 timeout 2. If the debounced function is called again, reset the timer to the specified delay debounceFn(input, [options]) Returns a debounced function that delays calling the input function until after wait milliseconds have elapsed since the last time the debounced function was called. It comes with a .cancel() method to cancel any scheduled input function calls. Type: Function. Function to debounce.

Design Patterns for Embedded Systems in C: An Embedded Software , LOOPS_PER_MS is the # of loops in the delay() function required to hit 1 ms, so it is Timeouts are often shown within a tm() event on the state machine. This means that we need to call different operations in the MicrowaveEmitter depending if DEBOUNCE_TIME (40) struct Button; struct MicrowaveEmitter; struct Timer;  The clearTimeout () method clears a timer set with the setTimeout () method. The ID value returned by setTimeout () is used as the parameter for the clearTimeout () method. myVar = setTimeout (" javascript function ", milliseconds ); Then, if the function has not already been executed, you will be able to stop the execution by calling the

Comments
  • Based on what you've described, what you're looking for is called "debounce".
  • Thank you this is exactly what I was looking for!
  • I assumed that also, but I couldn't find anything either.