topic Hide Unselected Features in Python Questions

Hide Unselected Features

babakkasraei — Mon, 21 Jan 2013 00:11:10 GMT

I have used the following codes to delete the selected features:


if int(arcpy.GetCount_management(layer).getOutput(0)) > 0:                 

       arcpy.DeleteFeatures_management(layer)

I have two questions

1- What if I want to deleted unselected features? Can I use the following syntax?


 if int(arcpy.GetCount_management(layer).getOutput(0)) = 0:             

       arcpy.DeleteFeatures_management(layer)

2- I don't want to delete the features. I only want to hide them. What syntax should I use instead of

            

       arcpy.DeleteFeatures_management(layer)

3- How about if I want to show them again. What syntax must be used?

I will appreciate if anybody help me.

Best Regards

Babak

Re: Hide Unselected Features

KimOllivier — Mon, 21 Jan 2013 02:22:55 GMT

The selected features definition is part of the layer properties.
All you are doing is counting the number selected before you delete them.
Selected features from a featureclass can be defined by a definition expression and a selection set that is arbitrary

There is an arcpy.Describe() property FIDSet that will enable you to get a list of selected FID's that you can build into a set
then invert the set and make a new layer definition, but it is a bit geeky. You have to manipulate a list of FIDs and use an SQL query with a list.

Re: Hide Unselected Features

babakkasraei — Mon, 21 Jan 2013 13:02:48 GMT

The selected features definition is part of the layer properties.
All you are doing is counting the number selected before you delete them.
Selected features from a featureclass can be defined by a definition expression and a selection set that is arbitrary

There is an arcpy.Describe() property FIDSet that will enable you to get a list of selected FID's that you can build into a set
then invert the set and make a new layer definition, but it is a bit geeky. You have to manipulate a list of FIDs and use an SQL query with a list.

Thank you Kim I will work on it.

Best Regards

Re: Hide Unselected Features

babakkasraei — Sat, 11 Dec 2021 06:54:04 GMT

Using the describe function will be something like this.


# describe the feature layer to access the the selected set
desc = arcpy.Describe(layer)

# FIDSet will contain the selected features
selectedFids = desc.FIDSet

# If there are selectedFids (a selection set), write them to a new feature
# class in the current workspace.
if len(selectedFids) > 0:
 do something

Please let me know how you want to invert it now.

Thanks

Re: Hide Unselected Features

MathewCoyle — Sat, 11 Dec 2021 06:54:07 GMT

Using the describe function will be something like this.


# describe the feature layer to access the the selected set
desc = arcpy.Describe(layer)

# FIDSet will contain the selected features
selectedFids = desc.FIDSet

# If there are selectedFids (a selection set), write them to a new feature
# class in the current workspace.
if len(selectedFids) > 0:
 do something

Please let me know how you want to invert it now.

Thanks

You'll have to create a layer object to reference the definitionQuery parameter if you haven't already. Then something like this.

oidField = desc.OIDFieldName
queryList = selectedFids.replace(';', ',')
oidDelim = arcpy.AddFieldDelimiters(layer, oidField)
layerObject.definitionQuery = '{0} in ({1})'.format(oidDelim, queryList)
arcpy.RefreshActiveView()

Re: Hide Unselected Features

babakkasraei — Sat, 11 Dec 2021 06:54:10 GMT

So It will finally become something like this.


# describe the feature layer to access the the selected set
desc = arcpy.Describe(layer)

# FIDSet will contain the selected features
selectedFids = desc.FIDSet

# If there are selectedFids (a selection set), write them to a new feature
# class in the current workspace.
if len(selectedFids) > 0:

    # Here I create a new FC from my selected FIDS
 arcpy.CopyFeatures_management(layer,"AnewFC")

queryList = selectedFids.replace(';', ',')
oidDelim = arcpy.AddFieldDelimiters(layer, oidField)
layerObject.definitionQuery = '{0} not in ({1})'.format(oidDelim, queryList)
arcpy.RefreshActiveView()

It is amazing Thank you. However, the last lines is a little bit confusing for me. Would you please add a little descriptions to them.

For instance I still don't know how it happens to hide the unselected features.

I appreciate your help.

Re: Hide Unselected Features

babakkasraei — Sat, 11 Dec 2021 06:54:13 GMT

You'll have to create a layer object to reference the definitionQuery parameter if you haven't already. Then something like this.
oidField = desc.OIDFieldName
queryList = selectedFids.replace(';', ',')
oidDelim = arcpy.AddFieldDelimiters(layer, oidField)
layerObject.definitionQuery = '{0} in ({1})'.format(oidDelim, queryList)
arcpy.RefreshActiveView()

Hi Kim

I have created the following codes for my "Hide Unselected Features" button function in My Tkinter as you instructed me, but they don't do anything.

Would you have a look on them. Why don't they work?


def button3Click(self, selection):
        index = self.listbox.curselection()               
        label = self.listbox.get(index) 

        # Local variables:
        layer = label

        # describe the feature layer to access the the selected set
        desc = arcpy.Describe(layer)

        # FIDSet will contain the selected features
        selectedFids = desc.FIDSet

        # If there are selectedFids (a selection set), write them to a new feature
        # class in the current workspace.
        if len(selectedFids) > 0:
           oidField = desc.OIDFieldName
           queryList = selectedFids.replace(';', ',')
           oidDelim = arcpy.AddFieldDelimiters(layer, oidField)
           layerObject.definitionQuery = '{0} in ({1})'.format(oidDelim, queryList)
           arcpy.RefreshActiveView()

ln these codes layer is an object layer which is chosen from a listbox.

Thank you for your help for doing my first button. It was a great help.

Please help me for this button too.

Best Regards