In response to an issue I raised earlier in June:
http://vizdiff.blogspot.com/2014/06/range-definiton-bug-in-color-editor.html

The bug is announced as fixed in Tableau Desktop 8.2.2:
http://www.tableausoftware.com/support/releases/8.2.2

"When the center value of a diverging color palette was set to a higher value than the end value, the entire color range displayed as the end color, rather than as a gradation."

I verified it in Desktop 8.2.2, Tableau Public 8.2.2, Tableau Server 8.2.2 and it looks good. Note that the simple test table contains all 0s.
But I found two bugs in Tableau Public Server and Color Editor.

1.When published to the Tableau Public server, it is still not rendered correctly! It's all green. Download the workbook and check by yourself.


2.Yet, there is a UI problem in the color editor as shown in the following picture. When setting Center=1 using Red-Green diverging color palette, and all table values are 0, the palette must have displayed red in the color editor, instead of green.
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(Refresh the page if you want to view the gif image multiple times. Or go to Tableau Public and click the button at the top-right corner.)

Jake and I collaborated on a dashboard. He told me that he learnt a way to create an in-place help page in Tableau. He first saw it at a conference somewhere and couldn't recall who the speaker was. So I am blogging here about it but the credit goes to somebody else. If anyone knows who the original creator is, leave a comment below.

The key idea is to float a semi transparent worksheet on top of the dashboard, where a help text box is strategically placed on top of each chart. This way, we can explain how to view each chart and what data points are important, etc. This worksheet is collapsible by a show/hide button. 

Below I would like to show how this worksheet can be constructed.

1. Sheet with a single data mark.

  • Double click the empty space in Marks panel and add two single quotes. Make the null pill a text label. This creates a single null mark.
  • Set the view as "Entire View"

2. Create an show/hide button

  • Go to the target dashboard
  • Drag a floating vertical container to the dashboard, making it cover all the area of interest.
  • Drag the Single Null Mark sheet and drop it into the above container. Hide the sheet title.
  • Create an open/close button for the container and place the button at the top-right corner.

3. Add annotations

  • Format the sheet background opacity as 70% in the layout manager             
  • Select area annotations and place them anywhere of interest. 
  • Write help text and format it to highlight important messages.  
  • The text can serve as functional guide and/or insight guide.

Here is an example. Feel free to download the workbook and explore. Click the "i" button at the top-right corner to view the in-place help. 

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