javascript window.location.href keeps adding to url

I have a simple dropdown that forwards to a new url onChange.

It looks like this:

function changeCompanyType(companyType) {
      window.location.href = 'type/'+companyType+'/';

    }

The first change works great and goes to the url:

http://127.0.0.1/companies/type/bank/

The next time I click on the dropdown from the new page it adds type and the company type again:

http://127.0.0.1/companies/type/bank/type/hosptial/

How can I just have the company type changed so the url doesn't keep being added to?

Prefix with a forward slash (/)

window.location.href = '/type/'+companyType+'/';
                        ^ -- a slash to make an absolute url

// or (depends on what you want to do)
window.location.href = '/companies/type/'+companyType+'/';
                        ^ -- a slash to make an absolute url