Question

110

setInterval and window.onload problem

rated 0 times [ 116] [ 6] / answers: 1 / hits: 17302 / 15 Years ago, fri, january 29, 2010, 12:00:00

I have this code

window.onload = function() {            

    function foo() {

        alert(test);

    }

    setInterval(foo(),500)

}

Which returns undefined...When i use it outside the window.onload it works. Can anyone explain me why?

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jackelyn

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answered 15 Years ago kamronr · Accepted Answer

Using a string command in setInterval() will try to look for the function in the global (window) scope, but since the function is defined in a local scope, it won't be found. You should pass the function itself to setInterval() instead.

window.onload = function() {            

    function foo() {

        alert(test);

    }

    setInterval(foo, 500);

}