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I have created a Python Tool in ArcGIS where most of the paramaters musts be ONLY Polygon Shapefiles. You can also look on my previous question:
Filter the Feature Layer parameter in Python Script Tool
Also, the user must be able to select ONLY Polygon Shapefiles either from the current MXD or his/her system.

In order to solve it, I tried to give the type "Feature Layer" on each parameter and filter them to show only polygons. But, I didn't manage to put the extra filter for Shapefiles. In this case it is the only think I miss.

FeatureLayerfilteredPolygons

The second attempt was the implementation of the answer on my previous question:

Filter the Feature Layer parameter in Python Script Tool

In this case, I had to enrich the suggested code with:

    lyr.supports("DATASOURCE")  

because I have groups in my data frames. I got the list of Polygon Shapefiles that are already open in the current MXD but I don't have the option to select a shapefile from the user system because (as suggested) the parameter type is String (the folder icon on the right side of the field is missing!).

FilteredStringField

To conclude:

  • Is there a way to filter the dropdown list of Feature Layer parameter inside ToolValidator, so that it shows ONLY Shapefiles (Polygons are already filtered)?
  • If the above is NO, then is there a way to add the folder icon next to the String parameter so that the user can select an external Polygon Shapefile?
  • If none of the above two answers are YES, then is there any other solution?
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