Excel - 动态下拉列表

Question

Looking to make a dynamic dropdown list in a table. The photo link below should help visualize the problem.

What I am looking to do is create a dynamic dropdown list in one table using a column from the same table and two columns from a second table in another sheet.

The column with the dropdown should compare the column to the left of it to right column of the second table. The options in the dropdown should be the values in the left column of the second table if the cell to the left of the dropdown cell equals the cell to the right of the value cell in the second table.|

The photo below shows the table setups and the numbers next to the top left table show what options that should be in the dropdown.

Edit: I was looking to do this without using Visual Basic, but I would be open to it if it were the only option.

Answer 1

This is called dependent data validation. You need to set up range names. One for each reference, and an additional one to resolve the reference into a dropdown using Indirect. I set up these four range names and for the data validation I used List > =MyDropdown

a   =Sheet1!$H$2:$H$5
b   =Sheet1!$H$6:$H$8
cc  =Sheet1!$H$9
MyDropdown  =INDIRECT(Sheet1!$A2)

Note that the reference inside the INDIRECT() function is relative to the cell that was active when the reference is defined. Select cell in row 2, then create a new named range with that formula. If you select another cell, this will not work.

Note also that the named range cannot be called 'c', so I had to use another reference name.

Answer 2

As per above data setup put below formula to H6

=TRANSPOSE(UNIQUE(E6:E13))

Then put below formula to H7 cell and drag across right.

=FILTER($D$6:$D$13,$E$6:$E$13=H$6)

Above formulas will spill data automatically. Then in data validation for range A1:A10 put below formula

=H$6$#

# after H$6$ will take data dynamically output by Unique() formula till last data.

Then for range B2:B10 data validation formula will

=INDEX($H$7:$J$10,,MATCH($A1,$H$6#,0))

Dropdown result