Rasmus Hedback

Another approach would be to let the form build the correct query string when submitting it, simply add a hidden input by adding this to script.js

const search_form = document.querySelector('form.search');
const input = document.createElement('input');
input.setAttribute('type', 'hidden');
input.setAttribute('name', 'type');
input.setAttribute('value', 'knowledge_base');
search_form.appendChild(input);