[OpenLayers-Users] Starting function if layerstatus is changed

[Adrian Popa]

Hello Kai,

Are you trying to turn the layer on/off from outside the Layer Switcher?

Regards,
Adrian

Kai Behncke wrote:
> 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
>>
>>     
>
>   


-- 
--- 
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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