Table Enhancements for #SportsVizSunday and Pro Football Focus

Community month continues for #WOW2020, with this week’s challenge being set by Spencer Baucke.

This week the challenge focuses on 3 techniques for enhancing a tabular display

  • Drill Down / Expand to show the breakdown by Year
  • Custom Header to control sorting
  • Page Control

I managed this challenge, but it wasn’t without help – I did my research using my friend, Google, and found tutorials to help, so this blog is briefer as you’ll need to read the blogs I reference too 🙂

Drill Down / Expand

There was a similar challenge last year which I blogged about here… or rather I referenced Rosario Guana’s excellent blog here.

The slight difference between this and the current challenge is that on expand/drill down, the Season is being shown in a separate column, rather than within the same one as above. The need for ‘data duplication’ which is referenced in Rosario’s blog isn’t required in this case. The key fields I used to resolve this part of the challenge are

pSelected Player ID

An integer parameter, defaulted to 0

pLevel

An integer parameter, defaulted to 2

Max Level

IIF([pLevel]=1,2,1)

If pLevel is 1 then we’ve already ‘drilled down’, so the max level on display is 2, otherwise we’ve yet to drill down, so the max level on display is 1.

DD Level

IIF([Max Level]=2 AND [Player Id]=[pSelected Player ID],2,1)

If we’ve already drilled down somewhere and you’re on the player we drilled down to, then the drill down level is 2, otherwise it’s 1.

Player ID Arrow

IF [pSelected Player ID] = [Player Id] AND [Max Level]= 2 THEN ‘▼’
ELSE ‘►’
END

If we’ve already drilled down somewhere and you’re on the player we drilled down to, then we want to display the down arrow. I use this site to get the geometric shapes required.

Season Display

IF [pSelected Player ID] = [Player Id] AND [Max Level]=2 THEN STR([Season])
ELSE ”
END

If we’ve already drilled down somewhere and you’re on the player we drilled down to, then we want to display the Season otherwise it needs to be blank.

Player ID Display

Player ID

This is just a duplicate field.

The fields are then arranged along with the measures as below

Player ID is hidden (it will used for the sort later). DD Level is added to the Detail shelf, so it can be referenced by the parameter actions.

NOTE – I had to ask as it wasn’t obvious to me, but the Carries measure is essentially the number of records or count of the table, so Avg YPC becomes SUM([Yards])/[Carries].

To complete the drill down, when added to the dashboard, the following parameter actions are required

Selected Player

passes the value from the Player ID field into the pSelected Player ID parameter

Set Level

Passes the DD Level field into the pLevel parameter

Custom Header to Control Sorting

I followed Tessellation’s blog post, Ultimate Guide to Tables : Headers pretty much verbatim to build the header sheet. Here’s just a few pointers below on how my solution matches with the blog.

For the Measure Rows field referenced, I used the Position field as a field in the data set that contained at least 3 values :

IF [Position] = ‘FB’ THEN -1
ELSEIF [Position] = ‘H’ THEN 0
ELSEIF [Position] = ‘P’ THEN 1
END

I created parameters

pHeader MeasureNames (which is the equivalent of MN Parameter referenced in the blog).

and pHeader Position which is the equivalent of the Category Parameter mentioned

The parameter actions were then set as

Header – Set Sort Measure

passes Measure Names to the pHeader MeasureNames parameter

and

Header – Set Sort Direction

passes the Position field into the pHeader Position parameter

When defining the other variables referenced in the blog, I had an issue with the Measure1 TF field; my version looks like

IF [pHeader MeasureNames ] = ‘Measure1’
AND [pHeader Position] = [Position]
THEN TRUE
ELSE FALSE
END

For the sorting, I created

Sort Measure Value

CASE [pHeader MeasureNames ]
WHEN ‘Measure1’ THEN [Carries]
WHEN ‘Measure2’ THEN SUM([Yards])
WHEN ‘Measure3’ THEN [Avg YPC]
WHEN ‘Measure4’ THEN SUM([TDs])
END

and then Sort

IF [pHeader Position] = ‘P’
//up arrow selected, sort ascending
THEN -1 * [Sort Measure Value]
ELSE [Sort Measure Value]
END

Note – I chose my up and down arrows to behave different from how they are described in the blog. To me clicking ‘up’ suggests a sort ‘upwards’ ie ascending from small to large.

The Sort field is then used to apply the sort to the Player ID field on the table

Page Control

Again I followed a blog by Tessellation – Ultimate Guide to Tables in Tableau : Pagination

The exception, was at Step 5 Build the page navigator, I simply created a new sheet called ‘Curr Page’. This referenced 2 calculated fields

Current Page No

[pPage No]

where pPage No is the equivalent of the page number parameter referenced in the blog.

Total Pages

FLOOR({COUNTD([Player Id])}/[pRows Per Page])+1

where pRows Per Page is the equivalent of the rows to show parameter referenced in the blog.

The only other slight addition required to this challenge, was to reset the page control to page 1 if the sorting was changed. This was done by creating a new calculated field

First Page No

1

adding this field to the Detail shelf on the header/sort controls sheet, then adding a parameter action

Reset to Page 1

which passes the First Page No to the pPage No parameter

Fingers crossed, I think I’ve covered the main points for this challenge and highlighted where the blogs might differ. My published viz is here.

This has given some great ideas of how to ‘pimp’ a table. I highly recommend you check out some of Tessellation’s other blog posts on tables :

Happy Vizzin’! Stay Safe!

Donna

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