[ACCEPTED]-Javascript: Is it ok to call cleartimeout before settimeout?-timer
Yes, that's fine. Also, you should call 1 "setTimeout()" like this:
timer = setTimeout(onAir, 60000);
Yes you can call clearTimeout on a nullvariable.
Also 2 i would suggest you change your setTimeout so it won't 1 use eval:
timer = setTimeout(onAir,60000);
Yes, you can call a clearTimeout on a null 1 variable and the world won't implode.
Yes you can call clearTimeout(timer), but there are some edge 9 cases where it may cause issues.
If timer had 8 been previously set with some other integer 7 value, you might be killing off a completely 6 unrelated timer.
setTimeout just returns an integer 5 index for the timer. If you're not sure 4 if a timer has been previously set, you 3 could add a check before calling clearTimeout:
if (window.timer)
{
clearTimeout(timer);
}
...
timer = setTimeout(onAir, duration);
A solution 2 to the possible pollution of the timer variable 1 is to use a closure:
(function(){
var timer,
duration;
duration = 60000;
window.onAir = function onAir(){
...code...
if (timer){
clearTimeout(timer);
}
timer = setTimeout(onAir,duration);
};
});
Clearing a Timeout raises not problem to 3 me (but i am not a javascript guru).
Btw, you 2 can find intersting things (checking an 1 existing Timeout) on this thread: Check if a timeout has been cleared?
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