On Dec 17, 3:29 pm, Evan M <[email protected]> wrote:
> This is the part of my code I am having troubles with, in this example
> there are 2 addresses in the addressArray.
getLocations is asynchronous. That means that it fires off a request
when that line is encountered, and then at some point later the
callback function fires.
So the code exection is
geocoder.getLocations(addressArray[0])
geocoder.getLocations(addressArray[1])
geocoder.getLocations(addressArray[2])
At this point the value of i is 2. Then the getLocations response for
i=0 comes back and runs the callback function. The first line is
alert(i)
and i is 2. The same thing happens for the next two callbacks.
One way around this, ensuring closure on i, is to use a helper
function in much the same way as a createMarker function:
function doGeocode(i,a) {
// i is local to this function
geocoder.getLocations(a,function(result) {
// i has its local value in the callback function
... }
}
for (i=0;i<numAddresses;i++) {
doGeocode(i, addressArray[i])
}
This binds the loop-counter i into the callback function. In this case
it would probably be clearer *not* to use i as the loop counter as
well as an argument in doGeocode, just to emphasise that they are not
the same variable.
Andrew
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