Is there a ranking question that's mobile friendly? The current drag-n-drop, then resort question type for ranking works great on a desktop, but not very effective on the phone.
On phones I'd use the multiple numerical input with validation "unique(self)".
You may check the screen resolutuion or the kind of device at the beginning of the survey and display the normal rankuing question on desktops the other on smaller devices.
Joffm
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The following user(s) said Thank You: DenisChenu, teracomp
Warning about the demo link : max(self) have issue in the 1st version of 3.X .
And with multi numeric : you don't need is_int(NUMBER_SQ003) now since you have a setting.
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