How can I add a slider?

[Youngjun]

Hello,

Our team modified the sample CODAP document (States and Education) to create map data about COVID-19. We tried to add a slider to see the changes of positive cases in each state on the map as time passes (from January to December). Could you help us add a slider to our document so that a user may be able to observe the changes in the cases in each state over the full period provided from January to December, 2020?

The link is as follows:

https://codap.concord.org/app/static/dg/en/cert/index.html#shared=https%3A%2F%2Fcfm-shared.concord.org%2FshbZIBnSAuV4TQGsDNJT%2Ffile.json

[Jonathan Sandoe]

Hello,

Here is your document modified with, I think, the slider working as you desired: https://codap.concord.org/app/static/dg/en/cert/index.html#shared=https%3A%2F%2Fcfm-shared.concord.org%2FZps4tjnOQN2Xg5y22nur%2Ffile.json

It takes a slightly advanced use of formulas to create. You will see that the slider’s axis has been adjusted to have a range of 2-12. There are two new attributes in the case table. The first, ‘Month’, just rounds the slider value to an integer. The second uses a sequence of embedded ‘if’s to pick a column based on month. It’s a useful little trick.

Jonathan Sandoe

[Author]

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