[Javascript] Anonymous functions

[Terry Riegel]

Hello,

Thanks for the responses. I am still very confused. I have never been  
able to get my head around this type of thing. I must be missing  
something. How I would do something like the following, and in the  
process it may answer my first question. (also is there some  
recommended reading I could do on this subject?)

suppose I have something like...
//global context
var a="Hello World";
...

  //local context, not global
  var a="Goodbye World";
  var listener = GEvent.addListener(marker, "click", function()  
{ alert(a); });
  a="Last Known";

When the event fires what will be in the alert. And how would I pass  
information from the local context to the alert?


In case my contrived example doesn't make sense here is the actual  
code I am struggling with... I would like the alert to show the value  
of i in the local context it is instead showing the last value of i.

for (var i in markers) {
  var where = new GLatLng(markers[i].lat, markers[i].lng);
  var opts = {title: markers[i].title};
  var marker = new GMarker(where, opts);
  map.addOverlay(marker);
  var listener = GEvent.addListener(marker, "click", function()  
{ alert(i); });
}



Thanks for any help with this.

Terry Riegel




On Dec 4, 2007, at 7:21 PM, Natalie Downe wrote:

> Hello,
>
>>> I would like to take the first function() {...} and make it a named
>>> function, but when I do it I get something like map undefined. How
>>> do I un-anonymous-ize a function?
>
> Where is map being defined? if you do take it out of this add listener
> call make sure you put it after where 'map' is specified, this could
> be why you are getting 'map undefined errors. So your code would look
> something like
>
>
> // somewhere where map is defined
>
> // taking out your function into a named function
> function myNamedFunction () {
>   document.getElementById("mapinfo").innerHTML="Zoom:
> "+map.getZoom()+" Bounds: "+map.getBounds();
>   GDownloadUrl(url, function(data, status) {
>       markers=eval(data);
>       map.clearOverlays();
>       for (var i in markers) {
>           var where = new GLatLng(markers[i].lat, markers[i].lng);
>           var opts = {title: markers[i].title};
>           var marker = new GMarker(where, opts);
>           map.addOverlay(marker);
>       }
>   });
> }
>
> // add the listner
> var listener = GEvent.addListener(map, "moveend", myNamedFunction);
>
> Kind regards
> Natalie
>
> --
> Natalie Downe
> Senior Client-side Engineer - Clearleft <http://www.clearleft.com>
>
> <http://notes.natbat.net>
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