Unique Entries in Userform Dependent Listboxes

Deepthi commented

…could you please help me tweak the code so that I can make multiple selections in listbox 1 in such a way that the values selected in list box two has all the values applicable for the selections made (listbox) but removes all duplicates?

First, a word about that post. I have used the relationship listbox template exactly zero times. I simply prefer to build my classes from scratch with names that reflect the business objects they represent. But I did reuse the userform and I didn’t change the control names from Parent/Child to Class/Student. I’m conflicted about that, but I’ll get over it.

Let’s say we have some classes and students. A class can have many students and a student can have many classes.

When you select a class, the userform lists the students. If you select more than one class, the userform lists all the student from the selected classes, but each student is listed only once.

Andrew and Payton are only listed once.

There are some significant changes to the code, not the least of which is removing the grandchildren. Also instead of tracking ActiveParent (singular), I now track ActiveClasses (plural) because my top listbox is now multiselect. When my Parent listbox changes, I have to see all the classes that are selected.

To get a unique student list, I use a dictionary object. My favorite thing about dictionaries is returning a zero-based array from the Keys or Items properties.

You can check out the rest of the code in the downloadable file.

You can download ParentChildUserformMulti.zip

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