How can I Populate Pre-Selected Matrix Choices?

My goal is to use the matrix as an inventory checklist. Is it possible to auto populate the choices so they are pre-checked upon opening the form? This would allow the crew to save time by having the super long inventory checked as "accounted for".

Yes, it's possible to automatically populate your form matrix field.

I'd recommend using our Populate.IO Tool to make this easier on you.

Example Matrix Form (before): 

http://form.jotform.us/form/52116375075150? 

Example Matrix Form (after):

http://goo.gl/6CY01H 

Example Populated URL for Quick Access:

http://form.jotform.us/form/52116375075150?q1_matrix[0][0]=true&q1_matrix[1][1]=true&q1_matrix[2][2]=true&q1_matrix[3][3]=true 

However, since you're looking to create a Inventory Checklist I would additionally also like to point out that we do have Checklist & Inventory Widgets for this which you may find useful if you haven't seen them yet.

Also, there is our actual AutoFill Feature that works with your browser cache for saving and continuing.