Adding a drop down menu to a python script

ElwoodGunther

I have a python script that I am running in ArcToolbox.  Right now it clips data into a particular feature dataset in a File Geodatabase. Does anyone have a way that when the user chooses a file geodatabase, a drop down menu gets populated with all of the Feature Datasets in that File GDB for the user to choose from?

Thanks

LoganPugh

You'll need to write validation code in the script tool's ToolValidator class to update the filter of a String parameter which will act as a combo box, the values in the filter corresponding to the feature datasets in the geodatabase.

More info here: http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Customizing_script_tool_behavior

This code seems to work:

class ToolValidator:
  """Class for validating a tool's parameter values and controlling
  the behavior of the tool's dialog."""

  def __init__(self):
    """Setup the Geoprocessor and the list of tool parameters."""
    import arcgisscripting as ARC
    import os
    self.GP = ARC.create(9.3)
    self.params = self.GP.getparameterinfo()

  def initializeParameters(self):
    """Refine the properties of a tool's parameters.  This method is
    called when the tool is opened."""
    return

  def updateParameters(self):
    """Modify the values and properties of parameters before internal
    validation is performed.  This method is called whenever a parmater
    has been changed."""
    if self.params[0].Value:
        self.GP.Workspace = str(self.params[0].Value)
        datasets = self.GP.ListDatasets("","Feature")
        if len(datasets) > 0:
            self.params[1].Filter.List = datasets
            if not self.params[1].Altered or self.params[1].Value not in datasets:
                self.params[1].Value = datasets[0]
        else:
            self.params[1].Filter.List = []
            self.params[1].Value = None
    else:
        self.params[1].Filter.List = []
        self.params[1].Value = None
    return

  def updateMessages(self):
    """Modify the messages created by internal validation for each tool
    parameter.  This method is called after internal validation."""
    return