The layer filter task will change the display filter of a layer or table in the web map.

Changing layer filters will substantially change the behaviour of the application. It is not possible to undo prior changes after this operation.

To use this task, a layer must be chosen. The data script should return a SQL expression.

Filtering a layer based on a field value

return "MYFIELD = 'SOMEVALUE'";

Failing the whole operation

// Failing the whole operation
return {
  error: "Cannot apply filter, as the specified field does not exist."
};