Jquery/Javascript to uncheck all items in a matrix question

Question

I will say my jQuery/JavaScript is rusty, but the Qualtrics naming and usage has me stumped. I have a two-column matrix question that allows the R to select one or both. I am being asked to create a second question with a check box that (if checked) would uncheck all of the entries in matrix.
Q1 Visited Stayed
Park 1 ___ ___
Park 2 ___ ___
Park 3 ___ ___

Q2
___ I did not visit or stay in any of these parks

Normally, I would put this in the matrix, but the request is to split it out. In the JavaScript for Q2: How do I reference (and set) the boxes accordingly? Is there a best practice for this type of situation? Any sample code would be appreciated.

Best answer by TerryP

I was able to figure it out. It didn't appear that the checkbox below the matrix was able to use the prop. Using .jQuery('QR~QIDn-1').prop('checked', false); worked.

TerryP · Accepted Answer

I was able to figure it out.  It didn't appear that the checkbox below the matrix was able to use the prop.  Using .jQuery('QR~QIDn-1').prop('checked', false);worked.

rondev · Answer

Yes, we need to add two click events, one for each question's (Matrix and multi select question) checkboxes. Check the demo here.

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