a spatial filter for UI

[pvgenuchten]

Overview

This adds a spatial filter option to UI.
Users can enable a bbox filter (or by adding the bbox parameter to url)
the bbox can be moved or resized, click apply to activate the filter

Related Issue / Discussion

#975

Additional Information

Common functionality works, operates against bbox=1,2,3,4, but not when a bbox is used in CQL

Let me know in which direction to further develop, or to convert to WIP?

Contributions and Licensing

(as per https://github.com/geopython/pycsw/blob/master/CONTRIBUTING.rst#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pycsw. I confirm that my contributions to pycsw will be compatible with the pycsw license guidelines at the time of contribution.
• I have already previously agreed to the pycsw Contributions and Licensing Guidelines

[tomkralidis]

var bbox_tokens = attrs['bbox'].split('%2C')

var bbox = [
          [{{ bbox_tokens[1] }}, {{ bbox_tokens[0] }}], 
          [{{ bbox_tokens[3] }}, {{ bbox_tokens[2] }}]
        ]

[kalxas]

Nice work @pvgenuchten !