Hi.
We are running Version 3.25.4+201215 of Limesurvey.
Currently, we would like to allow navigation back/forth through the survey, while using the question index (top right) to help navigation across groups.
Additionally, we plan to have a table of contents somewhere at the beginning where users get an overview and may jump (via link) to a specific chapter.
1. The Question Index uses URLs that use ?move=[number] syntax - are we allowed to use this as well?
2. The [number] is related to the group count (started from the beginning) and may change when adding a group at the very beginning. In these cases, the table of contents jumps to wrong places. Is there a way to overcome this?
Sorry in case this is stated somewhere in the manpages - in that case, simply leave a link to there and accept my apologies.

Just check at navigator you have the index with button

To see it : github.com/LimeSurvey/LimeSurvey/blob/e8...r_complement.twig#L8

 

I'm assuming that simply copying the index will not work for you so further to Denis' answer...

1) Yes, you can use those URLs in links with appropriate data-limesurvey-submit attributes.
OR
You can use buttons with attributes type="submit", name="move",  value="[group index number]".

2) No, the group index number cannot be changed - it is a sequential number in the group structure. If you add groups, you will need to manually modify the "table of contents".