Hi Mike,
I see. I see. Yes, this makes sense... Thanks for the fine explanation
and the samples. I'll think it over, probably I'll have to redesign my
app to use this approach. I don't have a complete picture yet, but I
think it might be possible.
Currently I'm using a relatively straight forward approach: The HTML
body has some form elements, used to parametrize the "GDownloadUrl"
query to my server. When the page loads, the very first action onload()
is to "GDownloadUrl" from the server. In the asynchronous callback I'm
then rendering the map with all the controls and markers returned from
my server using the params provided. The returned data is already JSON
formatted.
Kind regards
Mike Williams schrieb:
> Wasn't it Neil.Young who wrote:
>
>> And there is another fact, driving me crazy a bit: Even if ActiveX
>> support is disabled and GDownloadUrl fails, GDirections works without
>> any problems. On what track is GDirections running?
>>
>
> GDirections can't use anything remotely like GDownloadUrl or
> XMLHttpRequest or ActiveX, because it has to work cross domain. Those
> techniques are limited to accessing data from the same domain, for
> security reasons.
>
> GDirections, and all the other cross-domain API services, ends up using
> a <script src="..."> tag to fetch Javascript code. That will work across
> domains, and I believe that it will work in any environment where
> Javascript is enabled.
>
> If you want to try that, you need to rewrite your data as Javascript
> code, which could be as simple as gluing your existing data onto a
> single line and then putting it into a string, like
> var data = '<markers> <marker lat="43.1" lng="-79.2"> ... </markers>'
> Note: watch out for the fact that there's now an *extra* level of
> quotes.
>
> Process it like this:
> document.write('<' + 'script src="' + url + '"' +
> ' type="text/javascript"><' + '/script>');
>
> I guess it's synchronous, in which case you can immediately write
> if (data) {
> var xmlData = GXml.parse(data);
> ...
> }
>
> If you find that it's asynchronous, I guess you could put the Javascript
> code that processes the data into the file itself
>
> var data=' ... ';
> var xmlData = GXml.parse(data);
> var markers = xmlDoc.documentElement.getElementsByTagName("marker");
> for (var i = 0; i < markers.length; i++) {
> ...
> var marker = createMarker(point,label,html);
> map.addOverlay(marker);
> }
>
>
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