How to Create Custom "Input" Types
==================================

From time to time is may be necessary to create a custom "input" type for a service with GeoMOOSE.  This happens when you cannot get information about the map or from the user in a way that GeoMOOSE supports by default.

Step 1: Create an Input Type
----------------------------

Create the file, this one I called "MapWidth.js"::

	GeoMOOSE.Services.InputType.MapWidth = OpenLayers.Class(GeoMOOSE.Services.InputType, {
		MAPBOOK_NAME: "map_width",

		getValue: function() {
			var extent = Map.getExtent();
			return extent.right - extent.left;
		}
	});

Step 2: Add it to the "geomoose.html"
-------------------------------------

* Open "geomoose.html" in a text editor.
* Find `</head>` in the file.
* Add the following line::

	<script type="text/javascript" src="MapWidth.js"></script>

Step 3: Add the input type to a Service
---------------------------------------

Find the service to add the type to and add the input definition::

	<service ... >
		<input type="map_width" name="mw"/>
	</service>

Step 4: Enjoy
-------------

This is the easiest part!