BoundingBox and lockX

Movement can be locked to X or Y axis and also you can provide element in options.boundingBox to limit crossing element borders.

Items are locked in X axis movement and cannot cross its closest parent div.boundingBox, just try it your selves.

item 2

item 3

item 4

        
  dragularService([$element.children()[0].children(), {
    boundingBox: $element.children()[0],
    lockX: true
  });