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I am wondering is there a way to tell if a timeout is still set
var t=setTimeout("alertMsg()",3000); I thought t would be like undefined when you clear it. But it seems to have some id that does not get cleared.
782
To cancel a setTimeout() method from running, you need to use the clearTimeout() method, passing the ID value returned when you call the setTimeout() method.
You don't actually need to use clearTimeout , you only use it if you wish to cancel the timeout you already set before it happens. It's usually more practical to use clearInterval with setInterval because setInterval usually runs indefinitely.
It will clear all the timeouts, as setTimeout is an Asynchronous function, meaning that the timer function will not pause execution of other functions in the functions stack, thus clearAllTimeout runs and cancels them before they can be executed.
Not directly, but you can create a wrapper object to give that functionality. A rough implementation is like so:
function Timeout(fn, interval) { var id = setTimeout(fn, interval); this.cleared = false; this.clear = function () { this.cleared = true; clearTimeout(id); }; } Then you can do something like:
var t = new Timeout(function () { alert('this is a test'); }, 5000); console.log(t.cleared); // false t.clear(); console.log(t.cleared); // true If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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