How to clear setTimeout inside Javascript Object?

Question

I have an object that I have a few functions inside that I am using setTimout inside. I'm trying to clear the timeout using clearTimeout.. but I'm not hitting it right.

var ExpireSession = {
    killSession: function () {
        var TESTVAR2 = setTimeout(function () {
            window.location.href = "error/expired.aspx";
        }, 15000);
    },

    stopTimers: function (){
        clearTimeout(ExpireSession.killSession.TESTVAR2)
    }
}

Before 15 seconds I am triggering: ExpireSession.stopTimers(); but it does not stop it. Any ideaas what I am doing wrong here?

You've to define the timer as a property of ExpireSession. — Teemu
– Teemu, Commented Mar 30, 2015 at 14:28

Quentin · Accepted Answer · 2015-03-30 14:29:31Z

2

var TESTVAR2 is a variable that is local to the function it is declared within. It is not a property of an object.

If you want to access it as a property of an object, then you must define it as such:

ExpireSession.killSession.TESTVAR2 = setTimeout(function () {

(You might be able to make use of this depending on how you call the function).

answered Mar 30, 2015 at 14:29

Quentin

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Drenmi · Accepted Answer · 2015-03-30 14:33:59Z

1

Because JavaScript has functional scope, TESTVAR2 will only be defined within killSession. To reference it, you can set it as a property of ExpireSession:

killSession: function () {
  this._TESTVAR2 = setTimeout(function () {
    window.location.href = "error/expired.aspx";
  }, 15000);
},
stopTimers: function () {
  clearTimout(this._TESTVAR2);
}

answered Mar 30, 2015 at 14:33

Drenmi

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2 Comments

amazedinc Over a year ago

This worked, thank you. Can you explain why adding "this" to the variable made it accessible? I'm not following. Thank you!

Drenmi Over a year ago

When using a var declaration, you are defining a local variable. In JavaScript, these are local to the scope (in this case a function) where they were defined. When you are using this here, you are actually adding a property to ExpireSession. That is, ExpireSession._TESTVAR2 is your timeout. Because killSession and stopTimers are properties of ExpireSession, they can both access the _TESTVAR2 property.

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