Geospatial Plugin: Improve Event Support

[Jermolene]

This PR extends the geospatial plugin as follows:

• New "onclick" attribute on the <$geolayer> widget that is invoked when the layer is clicked. The variable properties contains the JSON properties of the layer

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[ericshulman]

For consistency with other widgets that perform "side-effect" actions when clicked or changed (e.g., $button, $checkbox, $select, $range, etc.), I think the parameter should be named "actions=..." rather than "onclick".

Also, in addition to the properties object, I will also need the coordinates object for the marker that is clicked upon so that I can use the latitude and longitude values to update the map state so I can center the map on the marker.

[Jermolene]

For consistency with other widgets that perform "side-effect" actions when clicked or changed (e.g., $button, $checkbox, $select, $range, etc.), I think the parameter should be named "actions=..." rather than "onclick".

We've already got an "updateActions" attribute on the <$geolayer> widget, so I've renamed "onclick" to "clickActions" for consistency.

Also, in addition to the properties object, I will also need the coordinates object for the marker that is clicked upon so that I can use the latitude and longitude values to update the map state so I can center the map on the marker.

Apologies the docs were missing but the click actions do actually also get the variables lat, long and alt with the coordinates of the marker.

[Jermolene]

Hi @ericshulman I've fixed the issue with the default popup template being used in the clickActions demo. Let me know how you get on.