JourneyJoker/static/frontend/js/custom-autocomplete.js

var input = document.getElementById('id_destination_name');
var options = {
  types: ['(cities)'],
  componentRestrictions: {country: 'at'},
  language: language
};

autocomplete = new google.maps.places.Autocomplete(input, options);
autocomplete.setFields(['geometry']);
autocomplete.addListener('place_changed', fillInAddress);

function fillInAddress() {
    // Get the place details from the autocomplete object.
    var place = autocomplete.getPlace();
    $("#id_destination_lat").val(place.geometry.location.lat);
    $("#id_destination_lon").val(place.geometry.location.lon);
  }