[OpenLayers-Users] Starting function if layerstatus is changed

[Kai Behncke]

Hi Adrian, Hi Alexandre,


thank you for your hints, nevertheless I didn`t get it.


With "my_layer.visibility" I will get easily the status (true/false),
but the problem I have is that I don`t know how to get the function setVisibility() (that is called after activatin/deactivating a layer in Control.LayerSwitcher).

I mean:
I turn the layer on/off and the function obviously is called.

But how can I do a request on that?


Something like:

if (setVisibility()) {
alert ("change");
alert (my_layer.visibility);
}
of 

If this.map.events.triggerEvent("visibilitychanged")) {
...
....
}

Well, I will try on.....


Best regards, Kai








-------- Original-Nachricht --------
> Datum: Fri, 14 Aug 2009 15:37:30 +0300
> Von: Adrian Popa <adrian_gh.popa at romtelecom.ro>
> An: Kai Behncke <Kai-Behncke at gmx.de>
> CC: users at openlayers.org
> Betreff: Re: [OpenLayers-Users] Starting function if layerstatus is changed

> Hello Kai,
> 
> Not sure if this is what you're looking for, but I registered my 
> function to run when the layer changes visibility (is toggled on/off):
> 
> markers.events.on({ "featureselected": onMarkerSelect, 
> "featureunselected": onMarkerUnselect, *"visibilitychanged": 
> onMarkerToggle* });
> 
> markers is a Vector layer, but the event should be available for every 
> layer. You can check in your function to see if the layer has been 
> toggled off or on by looking at markers.visibility:
> 
> *function onMarkerToggle(event) {
>         //do something if visibility becomes true
>         if(markers.visibility == true){
>           alert("This layer just turned visible!");
>         }
>     }
> *
> Regards,
> Adrian
> Kai Behncke wrote:
> > Dear users,
> >
> >
> >
> >
> > I would like to start a function if the layer is on/off.
> >
> > I tried e.g.
> >
> >
> > if (this.map.events.triggerEvent("changelayer")){
> > alert ("here we go");
> > }
> >
> >
> > and 
> >             
> > if (my_layer.display()){
> >
> > alert ("here we go");
> > }
> >
> >
> > ...but so far without success.
> > Can anybody help please?
> >
> > Thank you very much, Kai
> >   
> 
> 
> -- 
> --- 
> Adrian Popa
> NOC Division
> Network Engineer
> Divizia Centrul National de Operare Retea
> Departament Transport IP & Metro
> Compartiment IP Core & Backbone
> Phone: +40 21 400 3099
> 

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