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

[Kenneth Skovhede, GEOGRAF A/S]

This is one of the things that is special about MapGuide, and, IMO, not 
well explained in the user guide.
When you create the runtime map, the runtime map becomes a binary copy 
of the MapDefinition.
The runtime map has everything from the MapDefinition and some of the 
data from the LayerDefinition
of each layer.

Some properties has to be changed in the runtime map, others have to be 
changed in the LayerDefinition.
The runtime map never reads anything from the MapDefinition (AFAIK), so 
you will not get anything
out of changing the MapDefinition after the runtime map has been generated.

This is largely what you should do instead (replace with code after the 
first three lines):

$map = new MgMap();
$map->Open(resourceService, $mapName);
$map->GetLayers()[0]->Visible = true;
$map->Save($resourceService, $mapName);


Regards, Kenneth Skovhede, GEOGRAF A/S



gingerbbm skrev:
> [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
>>
>>