I have this code:
$(document).ready(function(){
var callPage = function(){
$.post('/pageToCall.php');
};
setInterval('callPage()', 60000);
});
and it gives me the error ReferenceError: Can't find variable: callPage. Why?
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what you expect in callpage. function returns nothing it looks!zod– zod2011-08-22 19:27:44 +00:00Commented Aug 22, 2011 at 19:27
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1@zod: the return value of callPage (or lack thereof) is irrelevant. What's relevant is probably the type of the first parameter of setInterval, as Bryan suggested.Eran Zimmerman Gonen– Eran Zimmerman Gonen2011-08-22 19:29:28 +00:00Commented Aug 22, 2011 at 19:29
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3 Answers
Try setInterval(callPage, 60000);.
If you pass a string to setInterval, then this string is evaluated in global scope. The problem is that callPage is local to the ready callback, it is not global.
There is hardly ever a reason to pass a string to setInterval (setTimeout). Always pass a function (to avoid exactly this kind of errors).
4 Comments
Bryan James
yea... you're passing a reference to a function. Not a String.
Maxim Krizhanovsky
@Felix Kling I refuse to gain reputation points from your answer, actually I would like to vote for your explanation :)
Felix Kling
@Darhazer: Well, I hope you at least don't loose any through that... It was totally fine for me, I already have enough reputation points ;) Your answer was correct and I didn't see a need to provide my own just to explain it... anyway what's done is done.
Maxim Krizhanovsky
@Felix Kling I've already earned the maximum daily reputation, so I'm not loosing anything either. But the purpose of SO is to educate readers, and not just giving a working code, so thank you for adding the explanation.
I suspect it's because callPage is a variable scoped to the anonymous function you're creating in the document.ready event. If you move the callPage definition outside that, does it work?
Comments
function callPage()
{
$.post('/pageToCall.php');
};
$(document).ready(function()
{
setInterval('callPage()', 60000);
});
It happens because callPage's scope is the anonymous function
