[ka-Map-users] XML Points File

Paul Spencer pspencer at dmsolutions.ca
Wed Jan 11 12:24:41 EST 2006


one problem with this is that you cannot load an XML document from an  
arbitrary URL.  Due to browser restrictions, you can only load it  
from the domain from which the page was loaded.  This really, really  
sucks and there is (almost) no way around it.

There are two ways you could implement this:

1.  a server-side script (php or other) included with ka-Map or  
hosted on the same domain that redirects the request to the remote  
server, gets the response and returns it to the client.  I call this  
the proxy approach.  This would have to be done carefully as it could  
expose a security risk.

2. the other technique uses the fact that you can create a <script>  
element via document.createElement and it will load and execute  
javascript from remote sites (and this isn't a security risk!  go  
figure).  The downside is that it loads javascript, which probably  
isn't appropriate for what you are intending.



On 11-Jan-06, at 11:01 AM, David Bitner wrote:

> I know that there has been some discussion on the list regarding
> similar functionality to the markers in google maps.  I also know that
> there is a good start in ka-map for adding points that will then pan
> along with the map.
> I am looking to create a javascript function that takes a url of a
> "service" and optionally a flag  to indicate that a bounding box
> should be sent and a new request should be made for each map extent.
> The "service" could then be either a script (php+postgis in my case)
> or a file that returns either a delimited string or an xml string.
> The return will indicate several points, each point will have an x and
> y coordinate, a url to an image to be shown on the map, and optionally
> html that will be included in a div that is used for mouseover events.
> Has anyone done anything along these lines already?  If not, are there
> any features or specifications that I could include that would help
> anyone else out?
> Thanks,
> David
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> ka-Map-users at lists.maptools.org
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|Paul Spencer                           pspencer at dmsolutions.ca   |
|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|

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