How do I correctly use setInterval and clearInterval to switch between two different functions?
You need to capture the return value from setInterval( ... )
into a variable as that is the reference to the timer:
var interval;
var count = 0;
function onloadFunctions()
{
countUp();
interval = setInterval(countUp, 200);
}
/* ... code ... */
function countUp()
{
document.getElementById("here").innerHTML = count;
count++;
if(count === 10)
{
clearInterval(interval);
countUp();
interval = setInterval(countUp, 200);
}
}
@Claude, you are right, the other solution I proposed was too different from original code. This is another possible solution, using setInterval
and switching functions:
function onloadFunctions() {
var count = 0;
var refId = null;
var target = document.getElementById("aux");
var countUp = function() {
target.innerHTML = count;
count ++;
if(count >= 9) {
window.clearInterval(refId);
refId = window.setInterval(countDown, 500);
}
}
var countDown = function() {
target.innerHTML = count;
count --;
if(count <= 0) {
window.clearInterval(refId);
refId = window.setInterval(countUp, 500);
}
}
refId = window.setInterval(countUp, 500);
}
clearInterval(this);
. You can't do that. You need to save the return value from setInterval
.
var interval;
function onloadFunctions()
{
countUp();
interval = setInterval(countUp, 200);
}
var count = 0;
function countUp()
{
document.getElementById("here").innerHTML = count;
count++;
if(count == 10)
{
clearInterval(interval);
countDown();
interval = setInterval(countDown, 200);
}
}
function countDown()
{
document.getElementById("here").innerHTML = count;
count--;
if(count == 0)
{
clearInterval(interval);
countUp();
interval = setInterval(countUp, 200);
}
}