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I am trying to determine method of stying across a data range using 'get' expression and multiple criteria in Mapbox Studio using Mapbox Expressions. In the example below I want to style a marker matching symbol = 'Restaurant' AND title = 'Social Brewery and Kitchen'. Is this possible?

[
  "match",
  ["get", "title", 'Social Kitchen and Brewery'],
  ["get", "marker-symbol", 'Restaurant'],
  "#f9a951",
  "#000000" //fallback
]
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1 Answer 1

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2
+50

Try concatenating the values:

["match",
  ["concat",
    ["get", "title"],
    ["get", "marker-symbol"],
  ],
  "Social Kitchen and BreweryRestaurant",
  "#f9a951",
  "#000000" //fallback
]

You may want to add a separaror with a second nested concat (or maybe expect a space character between values in the first place, I haven't tested).

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3
  • Would have thought there would be a more conventional way but this works for me. Thanks!
    – wtgeographer
    Commented Jul 19, 2021 at 20:51
  • 1
    @wtgeographer it may seem this is an obvious feature. However, don't forget this is a client mapping framework; while there is nothing stopping it from offering more sophisticated relational data access (and Mapbox GL is already bursting with [more or less needed] functionality), I would not say that it should necessarily be used that way. Rather, IMO, pre-categorize and encode as much information as possible on the backend (and in DB), and transfer only the bare minimum of data to the client - think perfomance/bandwith, and security (i.e. obfuscating internal data structures).
    – geozelot
    Commented Jul 20, 2021 at 8:19
  • Agreed! Thanks @geozelot
    – wtgeographer
    Commented Jul 21, 2021 at 19:42

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