topic Re: Remove Option from Toolbox Parameter Value List if Selected in ArcGIS Pro Questions

Remove Option from Toolbox Parameter Value List if Selected

RichardHowe — Fri, 11 Nov 2022 09:10:33 GMT

I have a tool which has a string parameter with a predefined value list filter, allowing the user to select multiple options from a dropdown list in the GUI.

However, when they select one option, I would then like that option to be removed from the list which they choose the next option from. Is this possible, and if so how? In an ideal world it would be the default behavior, because I struggle to think of why you would want to put the same option in twice as a user, but you can.

In the image below the Value List filter comprises A, B, C and D. As you can see the user has chosen A for the first entry and B for the second. I would like the options for the next entry to just be C and D, so they can't errantly pick A or B again...but that isn't the case.

I feel perhaps some kind of validation is probably the answer to this, but I can only find documentation to make individual parameters dependent on another parameter, not on entries for the same multi value parameter.

Re: Remove Option from Toolbox Parameter Value List if Selected

DanPatterson — Fri, 11 Nov 2022 10:14:02 GMT

To ensure sorted order

vl = ['A', 'A', 'B', 'C', 'D', 'D'] out = sorted(list(set(vl))) out ['A', 'B', 'C', 'D']

and uniqueness in your validation

Re: Remove Option from Toolbox Parameter Value List if Selected

RichardHowe — Fri, 11 Nov 2022 10:16:33 GMT

Dan, thanks. I understand how to script for removing accidental duplicate picks, that isn't an issue. I just don;t want them to be able to do it. It just seems illogical that it will show already selected values in the dropdown

Re: Remove Option from Toolbox Parameter Value List if Selected

DanPatterson — Fri, 11 Nov 2022 10:27:04 GMT

unless you want to use the value list to process things in a certain order with repeats, like recalculating coordinates for featureclasses in different coordinate sytems (eg. 'A', 'A', 'B') some with repeats, others without

Re: Remove Option from Toolbox Parameter Value List if Selected

RichardHowe — Fri, 11 Nov 2022 10:30:42 GMT

Perhaps I'm not being particularly clear. Apologies.

If the user picks A for the first entry, then I don;t want A to appear in the list of options they can pick from in the next row. Imagine if this was the delete fields tool, it wouldn't allow the user to pick the same field to delete twice, once it was selected once, then it wouldn't be in the list of options they could pick to delete at the same time

Re: Remove Option from Toolbox Parameter Value List if Selected

DanPatterson — Fri, 11 Nov 2022 10:38:33 GMT

In my example I was clear about enabling the user to be able to select the same input more than once in an order that I want for processes that provide a list for me to process. If your workflow requires unique entries, then do this during validation of the inputs. In that fashion, the widest possible uses of a value list can be attained, eg. those with unique values or not, those in any order or not. Different workflows shouldn't be disabled because or user preferences may differ

Re: Remove Option from Toolbox Parameter Value List if Selected

RichardHowe — Mon, 14 Nov 2022 12:45:17 GMT

I still don't think you understand my question. I am providing a pre-populated value list filter for a single parameter, that allows multiple values. That single parameter shows the dropdown list to the user in the toolbox GUI and they can pick an item from it, then, if they wish to pick another item from it, for the same parameter, they can. However I don't want them to be able to select the same value again and I still can't visualise a use case for picking exactly the same value as a second input to the same parameter. Regardless of which, I would like to know how to prevent it happening.

Re: Remove Option from Toolbox Parameter Value List if Selected

DanPatterson — Mon, 14 Nov 2022 20:36:59 GMT

I understand your use case.

I have mine which I have provided an example for.

I wouldn't want your workflow to be the only one.

And there is no way to disable it.

Re: Remove Option from Toolbox Parameter Value List if Selected

tyler_fossett — Fri, 09 Feb 2024 21:21:39 GMT

Hey Richard,

I feel obligated to reply because the response you received is incorrect... I achieved what you are describing. My approach would look something like this with your situation:

def updateParameters(self, params): filtervals = ['A', 'B', 'C'] try: ## create a list of previously selected values from filter list paramvals = params[0],valueAsText.split(";") ## remove selected values from temporary filter list for val in paramvals: ## list of selected values contains apostrophes, so must remove them filtervals.remove(val.replace("'","")) ## reassign filter list after removing selected values params[0].filters[0].list = filtervals except: ## this avoids error message if user has not selected anything pass def updateMessages(self, params): ## removing previously selected items from the filter list creates an error message ## next to previously selected items saying they are not in the list... ## the tool still works as intended, so I just clear that message to make it look cleaner params[0].clearMessage()

Anyways, I wanted to share because I almost gave up after reading the response to your question. It seems more intuitive for it to behave like you describe though.

Cheers

Re: Remove Option from Toolbox Parameter Value List if Selected

RichardHowe — Mon, 12 Feb 2024 08:50:33 GMT

Tyler, you legend. Thank you!!!

Re: Remove Option from Toolbox Parameter Value List if Selected

tyler_fossett — Tue, 13 Feb 2024 16:06:12 GMT

Happy to help! I did notice room for improvement with original code... if the user exhausts the list to the point where no more items should be shown, the original code I provided shows the full list again if the user keeps trying to select values.

This can be solved by replacing line 11 in the original code with lines 9-12 below. I added a line to my execute function as well so it ignores the space placeholder.

def updateParameters(self, params): filtervals = ['A', 'B', 'C'] try: paramvals = params[0],valueAsText.split(";") for val in paramvals: filtervals.remove(val.replace("'","")) ## ****************************************** if not filtervals: params[0].filters[0].list = [" "] else: params[0].filters[0].list = filtervals ## ****************************************** except: pass