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JavaScript: legit use of setTimeout?

Posted on 2007-11-30
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Last Modified: 2013-11-19
Hi,

I've found this in the source code of http://iphone.facebook.com and have never seen it used as such. Would anyone be able to explain to me if this is a valid way of using setTimeout()?

<body onload="setTimeout(scrollTo, 0, 0, 1)">

I see three coordinates for window.scrollTo and a lack of a Timeout value. Is one being used implicitly?

Thanks.
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Question by:stevefNYC
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netsmithcentral earned 500 total points
ID: 20385743
This is a special FF only version of the window.setTimeout method.  Additional parameters passed after the first two are treated as parameters to the function call.

Mozilla (FF): http://developer.mozilla.org/en/docs/DOM:window.setTimeout
Microsoft (IE): http://msdn2.microsoft.com/en-us/library/ms536753.aspx
var functionName = function( param1, param2 ) {

     //Some function code

};
 

var timeoutPeriod = 0; //Time to wait

var functionParameter1 = 'someVal'; //A parameter to the function

var functionParameter2 = 'someVal'; //Another parameter
 

TimeoutID = setTimeout(functionName, timeoutPeriod, functionParameter1, functionParameter2);

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by:stevefNYC
ID: 20385758
It can't be FF specific. This code is for a mobile safari application....
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Expert Comment

by:netsmithcentral
ID: 20385762
It may have been adapted to work in other browsers, but according to that Mozilla developer doc (which I previously linked), it's designed for FF and doesn't work in other  browsers.
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by:stevefNYC
ID: 20385773
Fair enough... I do see now that the first value is the timeout to wait and the second two are the coordinates. Just never seen it used this way.

Thank you!
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Expert Comment

by:netsmithcentral
ID: 20385796
I hadn't seen it that way before today either.  Glad I could of assistance!
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