[OpenLayers-Users] Options in constructors - Beginner Question

[Tim Schaub]

Hey-

Jaume Figueras wrote:
> Hi,
> 
> I can't find in the docs which are the options that can be configured in 
> many constructors, and also, what they mean. I can figure out from some 
> examples and try and error, but I can't find them in the docs.
> 
> Can you link me where the options are explained?

In general, you can set the value of any API property in a contructor's 
options argument.

For example, looking at the docs for the Vector layer [1], you can see 
the isBaseLayer property.  If you specify an isBaseLayer property in the 
options argument, this will be set on the layer.

e.g.

     var layer = new OpenLayers.Layer.Vector("not required", {
         isBaseLayer: true
     });

     layer.isBaseLayer === true;  // this is true

You can also see that the Vector layer inherits from OpenLayers.Layer. 
Following the link to the Layer API docs [2], you'll find a reference to 
the layer's projection property.  As with isBaseLayer, if you provide a 
projection property in the options argument, this value will be set on 
the layer.


     var layer = new OpenLayers.Layer.Vector("Layer Name", {
         projection: new OpenLayers.Projection("EPSG:900913")
     });

I've just committed this to the OpenLayers docs for future reference.
http://doc.openlayers.org/library/syntax.html

Tim

[1] http://dev.openlayers.org/apidocs/files/OpenLayers/Layer/Vector-js.html
[2] http://dev.openlayers.org/apidocs/files/OpenLayers/Layer-js.html

> 
> Now I'm searching the pointRaduis and rules, so, what is pointRadius?
> 
> Thank you,
> 
> Best,
> 
> Jaume.
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-- 
Tim Schaub
OpenGeo - http://opengeo.org
Expert service straight from the developers.