laravel 5 dynamic dropdown in many to many relationship

I'm building an educational website and I want to create a dynamic dropdown depending on other dropdown. I have many to many relationship between Branchs table and Semestrs table and that's brought me to a third table with Ids(pivot),the models and the migration are all set. How can I create a dynamic dropdown depending on select for a branch and load only semesters related to this one? please help!

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