[javascript] How to use setInterval and clearInterval?

function doKeyDown(event) {
    switch (event.keyCode) {
    case 32:
        /* Space bar was pressed */
        if (x == 4) {
            setInterval(drawAll, 20);
        }
        else {
            setInterval(drawAll, 20);
            x += dx;
        }
        break;
    }
}

Hi all,

I want to call drawAll() once not creating a loop that call drawAll again and again, should I use recursive method for that or should I use clearInterval?

Also please tell me to use clearInterval? Thanks :)

Use setTimeout(drawAll, 20) instead. That only executes the function once.

I used angular with electron,

In my case, setInterval returns a Nodejs Timer object. which when I called clearInterval(timerobject) it did not work.

I had to get the id first and call to clearInterval

clearInterval(timerobject._id)

I have struggled many hours with this. hope this helps.

clearInterval is one option:

var interval = setInterval(doStuff, 2000); // 2000 ms = start after 2sec 
function doStuff() {
  alert('this is a 2 second warning');
  clearInterval(interval);
}

Side note – if you want to use separate functions to set & clear interval, the interval variable have to be accessible for all of them, in 'relative global', or 'one level up' scope:

var interval = null;    

function startStuff(func, time) {
    interval = setInterval(func, time);
}

function stopStuff() {
    clearInterval(interval);
}