google gecoding service and cross domain requests

[dolittle]

Hi,

I'm using google geocoding service as described here:

In the example the url for the request is:

http://maps.google.com/maps/geo?output=json&...&callback=_xdc_._1fsm2u0k2

and the response:

_xdc_._1fsm2u0k2 && _xdc_._1fsm2u0k2({
  "name": "1600 Amphitheatre Pky, Mountain View, CA",
  "Status": {
  ...
  ...
  ...
    }
)

I understand how cross domain requests and ScriptTagProxy works but I don't understand why google respond with:

_xdc_._1fsm2u0k2 && _xdc_._1fsm2u0k2({...

and not with:

_xdc_._1fsm2u0k2({...

Any ideas?

Thanks

[Animal]

It's a truth test.

The statement will not execute unless _xdc_._1fsm2u0k2 exists

Type the following into the Firebug console:

function f(){alert(1);}

then

undefined && f()

You see that the function is not run.

[dolittle]

That's interesting.

Couldn't this improve the following code in scriptTagProxy:

// private
    destroyTrans : function(trans, isLoaded){
        this.head.removeChild(document.getElementById(trans.scriptId));
        clearTimeout(trans.timeoutId);
        if(isLoaded){
            window[trans.cb] = undefined;
            try{
                delete window[trans.cb];
            }catch(e){}
        }else{
            // if hasn't been loaded, wait for load to remove it to prevent script error
            window[trans.cb] = function(){
                window[trans.cb] = undefined;
                try{
                    delete window[trans.cb];
                }catch(e){}
            };
        }
    },

In case of a timeout failure the check if the function exist is not necessary.

Could this be a feature request?

Thanks