varia-library-website/library/static/js/search.js

let searchInput = document.getElementById('booksearch');
var allpublications = document.getElementsByClassName("filter");

const ENTER_KEY_CODE = 13;

searchInput.addEventListener('keyup', function(e) {
  if (e.keyCode === ENTER_KEY_CODE) {
    if (searchInput.value.length > 2) {
      searchBooks(searchInput.value);
    } else {
      clearSearchBooks();
    }
  }
})

function searchBooks(searchQuery) {
   let searchUrl = `search/${searchQuery}`
   fetch(searchUrl)
    .then(response => response.json())
    .then(searchdata => {
        console.log(`book ids: ${searchdata} found for ${searchQuery}`);
        if (searchdata === undefined || searchdata.length == 0) return;
        for (i = 0; i < allpublications.length; i++) {
          removeClass(allpublications[i], "show");
        }
        searchdata.forEach(bookid => {
          showBookId(bookid)
        });
    })
}

function showBookId(bookid) {
  let book = document.getElementById(bookid)
  addClass(book, "show");
}


function clearSearchBooks() {
  for (i = 0; i < allpublications.length; i++) {
    addClass(allpublications[i], "show");
  }
}