Bootstrap 3rd level menu not working?

Question

Bootstrap

We need to implement a multi-level menu on Bootstrap, I used the example. We create our own multi-level menu on bootstrap 3,
but the third level does not work, I can’t understand what’s wrong?
jsfiddle

Answer 1

where did you lose the js from the example? https://jsfiddle.net/nnhua9e7/1/