[mapguide-users] Extending the functionality of built-in commands (Ajax viewer)

[gingerbbm]

[This question is off the back of 
http://n2.nabble.com/RE%3A-Bypassing-initial-view-at-startup-td790257.html
this thread .]

I have successfully intercepted the call to mapagent.fcgi with a call to my
own PHP page (let's call it "bespoke.php"). I build a querystring of all the
POST or GET parameters and simply redirect at the end of bespoke.php like
so:


	$url = "mapagent.fcgi?" . $querystring;
	header("Location: $url");
	exit();


That works nicely.

Ultimately, before redirection occurs, I want to alter the feature class of
one of the layers, but for now I'm just trying to toggle the visibility of
one (via the MapDefinition) to prove the point. I simply read in the map
definition as XML, tweak it, then write it back:


	$siteConnection = new MgSiteConnection();
	$siteConnection->Open(new MgUserInformation($sessionId));
	$resourceService =
$siteConnection->CreateService(MgServiceType::ResourceService);

	// Use MapDefinition from the Session
	$mdResourceId = new
MgResourceIdentifier("Session:$sessionId//$mapName.MapDefinition");
	$mdReader = $resourceService->GetResourceContent($mdResourceId);
	$mdXml = $mdReader->ToString();
	$mdDomDoc = DOMDocument::loadXML($mdXml); 

	$node = $mdDomDoc->getElementsByTagName("Visible")->item(1);
	$node->nodeValue = "false";

	$mdUpdatedXml = $mdDomDoc->saveXML();
	$mdByteSource = new MgByteSource($mdUpdatedXml, strlen($mdUpdatedXml));

	// Overwrite
	$resourceService->SetResource($mdResourceId, $mdByteSource->GetReader(),
null);


Although I can confirm that the MapDefinition in the Session is changing as
expected (by interrogating http://.../mapguide/mapagent/index.html), the
map's appearance does not change as expected when it redraws.

Any ideas why not?

Thanks
Stuart



Kenneth Skovhede, GEOGRAF A/S wrote:
> 
> I'm sure it can be done.
> However, it seems fairly advanced.
> I would suggest that you have a look at OpenLayers:
> http://openlayers.org
> 
> With OpenLayers, you can have your MapGuide map as a base layer,
> and then put an overlay with your custom layer.
> You can then override the mapagent path in the overlay to point to your 
> customization page, rather than mapagent.fcgi.
> 
> If you want to stick with the WebLayout based you will most likely get 
> better results with a manually added overlay image.
> The problem with the manual approach is passing on events to the image 
> below.
> 
> Another option would be to have all calls to mapagent.fcgi point to your 
> PHP script, and then make the script
> act as a relay page for those calls that you are not interrested in.
> 
> Regards, Kenneth Skovhede, GEOGRAF A/S
> 
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