Javascript - Pass a function with arguments as an argument

Question

I'm cleaning up some script errors and have a delicate dilemma.

Consider this line of code:

Session.Timer = window.setTimeout("TimeoutHandler(Session)", 1000);

This will not work because when the Timeout tries to execute TimeoutHandler(Session) it will not know what the Session variable is (out of scope).

Is there a way to get the Session "value" translated to a string or number so it will be executed correctly?

cobbal · Accepted Answer · 2011-06-14 23:58:20Z

6

Use a closure (using an anonymous function) instead of a string, it will keep a reference to Session for you.

Session.Timer = window.setTimeout(function() { TimeoutHandler(Session); }, 1000);

If you're unfamiliar with closures, here's a brief introduction.

edited Jun 14, 2011 at 23:58

answered Jun 14, 2011 at 23:51

cobbal

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3 Comments

alex Over a year ago

+1, but closure or anonymous function makes it sound like they are the same thing.

cobbal Over a year ago

@alex Can't quite find wording I like for that, but for basic purposes anonymous functions and closures are closely enough related.

Max Kielland Over a year ago

so obvious when I quick read the article :) I didn't know they kept the local variables even of scope. I learned something new! I could even implement the first solution I had in mind from the beginning :D

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