I check other answer for similar problem, so either with this question:  

Need select all Input:Checkbox from a Form but identifying his ID.  

I try with: `$( "input:checkbox[id^='ingr_']" )` and run perfect for "Checked" elements. So the unchecked elements, jquery said to use :not(:checked). Put this on the code then obtain nothing (checked or unchecked).  

This is my sample code running on fiddle: [JsFiddle](http://jsfiddle.net/mastercafe/d6o73avf/5/)