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In a previous stackexchange question

I got help to use a geojson property to create layers on a map.

However, the layer control only keeps the latest point he gets so I can't switch on/off all points of a "destination".

If all markers have a different destination it will work but if some markers shares same destination it fails.

Here is the playground.

The geojson used is just an extract for the test. I 'need' to place hundreds of points in a few categories ("destination" in my case). Let's say, all museum and all schools, and I'd like to control the visibility of the layer on the map.

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    See stackoverflow.com/questions/33478202/…
    – ghybs
    Nov 18, 2016 at 10:06
  • @ghybs It's almost working, I notice that all the checkboxes are unchecked by default. So that once I click the control to uncollapse it, all the layers disappear. And I have to check them one by one to display them again. playground is updated
    – mmeinert
    Nov 18, 2016 at 14:45
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    That is probably because you add your GeoJSON layer to the map, instead of the Layer Groups that are actually referenced as overlays in your Layers Control.
    – ghybs
    Nov 18, 2016 at 15:31
  • Indeed but what if I want the layers to be shown by default ? playground updated
    – mmeinert
    Nov 20, 2016 at 16:40
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    Add your Layer Groups to map, not your GeoJSON group. The ones that are referenced as overlays in your Layers Control.
    – ghybs
    Nov 21, 2016 at 10:15

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Here is the solution, comments from @ghybs where valuable

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