Ability to change feature color without event

I’m trying out carto vl and I wonder If there’s a way to modify a geometry color obtained by carto without a map event. My goal is to click a button and obtain the same Feature object I get when I add an event like featureClick or so.

I’m not sure if this is related to #954

[davidmanzanares]

Hi,

With #954 the workflow will be easier.

In the meantime, you can still do it, but it will take a little bit more of code.

If I understood correctly you want something like this (pseudo-code):

color: feature == theFeatureImInterested ? red : green

This can be expressed in CARTO VL with:

color: blend(red, green, $featureID == @selectedID)
@selectedID: -1

You’ll be able to change the selected feature with viz.variables.selectedID = 1234.

Of course, you can provide any kind of boolean-like logic as the third parameter:

color: blend(red, green, $featureCountry == 'Spain' or $featureCountry == 'France' )

Assuming you only want to have one “focused” feature this won’t be a nightmare, if you plan to have more, the only way is to use blend in a recursive manner, this is from my expericence very difficult and I would recommend to wait for #954 if that is your case.

[davidmanzanares]

We released version 0.10.0 with #1085 included, mentioned bugs should be fixed there too.