[OpenLayers-Users] Overwriting OL classes

[Christopher Schmidt]

On Mon, Apr 06, 2009 at 09:04:56AM -0700, Gregor at HostGIS wrote:
> > * Override methods:
> > * Pass in custom functions to options:
> 
> You can pass in function definitions with configuration options? I 
> didn't know that! I take it that's a feature of Prototype?

That's a feature of OpenLayers. "options" are -- on all classes where we
have them -- used to extend the existing object, using something like:

  OpenLayers.Util.extend(this, options);

"Most OpenLayers object constructors take an options object as one of
their arguments. In general, you can set the value of any API property
in a contructor’s options argument." --
http://docs.openlayers.org/library/syntax.html#the-options-argument

However, that 'property' can also be 'method' -- it's just a question of
what we actually support. (If you override functions like this and
something breaks, my first suggestion will be to remove your overrides
and see if it's still broken.)

> And the override-by-assignment feature using the classes' .prototype 
> attribute; very nice too. Thanks for the education in Prototype here too.

   s/Prototype/Javascript/

-- Chris

> -- 
> HostGIS, Open Source solutions for the global GIS community
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-- 
Christopher Schmidt
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