What do you mean exactly by # 3?
Currently i can click the image to go to another dashboard (cause it’s linked by URL or something)
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Okay, I'm guessing your primary question is the image thing. If you need help with # 3, let me know, but here's how do to the image thing.
Start out by creating custom shapes for your images. Then drag your dimension to the shape card and assign your custom shapes. Here's an example with a very simple data set:
Now create a calculated field that will specify our target image:
// This is the image that we want to change to on click.
IF [Image]="Depp" THEN
Drag Target Image to the detail card so that it's available to us in the next step.
Now set up a filter action like this. The key is that you'll use Target Image as the Field and Image as the target. This will tell Tableau that you want to change Image to the value of Target Image. Make sure that you change the "Run action on" to "Select". Also make sure that "Clearing the selection will" is set to "Leave the filter".
Now click on one of the images. It'll now look something like this:
As you can see, Tableau's messed with the image size a bit. So fiddle with the size of the mark and the size of the cell until you have it something like this:
Now when you click the image, it will toggle between Gene Wilder as Willy Wonka and Johnny Depp as Willy Wonka:
I'm attaching my sample data set and a packaged workbook.