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I have two text style cells as shown in the picture (second one is hidden). Is it possible to add an interactive button so that if someone clicks on that button/text then the second cell's can be toggled between open and hidden?

Alternatively, it is also fine if a mouse-over on a button/text brings up a message saying that there is a hidden cell nearby but I would really prefer to have the toggle thing if it is possible in Mathematica.

Desired Output :- When someone clicks on expand the cell below then the hidden cell is set to open and when it is clicked again then the cell is again hidden.

img

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You could use a button like this:

Button["Toggle cell below", SetOptions[NextCell[], CellOpen -> ! CurrentValue[NextCell[], CellOpen]]]

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    $\begingroup$ You could also make the button label dynamic: Button[Dynamic[If[CurrentValue[NextCell[], CellOpen], "Less", "More"]], SetOptions[NextCell[], CellOpen -> ! CurrentValue[NextCell[], CellOpen]]] $\endgroup$ – Bob Hanlon Jun 13 at 14:59
  • $\begingroup$ Both of these work very well. Thank you :) $\endgroup$ – Nitin Jun 13 at 15:47
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You can set the option "ShowGroupOpener" to True for the first cell of a cell group to add an Opener to open/close the cell groups. Alternatively, set the option "WholeCellGroupOpener" to True to make the whole cell a behave like a toggler button.

You can do this in two ways:

Manually: Right-click the cell bracket and select Properties to open the Option Inspector notebook. ClickCell Options >> Display Options and change the setting for "ShowGroupOpener".

enter image description here

Programatically: In the first cell of the notebook, using some identifying text for the cells to be modified ("comments" in the example below), execute

SetOptions[NotebookFind[EvaluationNotebook[], "comments", All], 
 "ShowGroupOpener" -> True]

enter image description here

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  • $\begingroup$ This is absolutely perfect. I hope you don't mind that I keep the other answer as the accepted one because that was posted earlier and the contributor is new. $\endgroup$ – Nitin Jun 14 at 15:27

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