javascript - 如何将ENV变量传递到脚本标签中

我正在尝试将application.yml文件中的api密钥传递到Google地图的js脚本标记中，这可能吗？如果没有，最好的解决方法是什么？另外，我正在使用Figaro gem来存储ENV变量。提前致谢。

    <% if @location.latitude.present? && @location.longitude.present? %>
  <script>
    var myLatLng = {lat: <%= @location.latitude %>, lng: <%= @location.longitude %>};
    function initAutocomplete() {
    var map = new google.maps.Map(document.getElementById('map'), {
      center: myLatLng,
      zoom: 13,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    var marker = new google.maps.Marker({
      position: myLatLng,
      map: map,
      title: '<%= @location.name %>'
    });

    // Create the search box and link it to the UI element.
    var input = document.getElementById('pac-input');
    var searchBox = new google.maps.places.SearchBox(input);
    map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);

    // Bias the SearchBox results towards current map's viewport.
    map.addListener('bounds_changed', function() {
      searchBox.setBounds(map.getBounds());
    });

    var markers = [];
    // Listen for the event fired when the user selects a prediction and retrieve
    // more details for that place.
    searchBox.addListener('places_changed', function() {
      var places = searchBox.getPlaces();

      if (places.length == 0) {
        return;
      }

      // Clear out the old markers.
      markers.forEach(function(marker) {
        marker.setMap(null);
      });
      markers = [];

      // For each place, get the icon, name and location.
      var bounds = new google.maps.LatLngBounds();
      places.forEach(function(place) {
        var icon = {
          url: place.icon,
          size: new google.maps.Size(71, 71),
          origin: new google.maps.Point(0, 0),
          anchor: new google.maps.Point(17, 34),
          scaledSize: new google.maps.Size(25, 25)
        };

        // Create a marker for each place.
        markers.push(new google.maps.Marker({
          map: map,
          icon: icon,
          title: place.name,
          position: place.geometry.location
        }));

        if (place.geometry.viewport) {
          // Only geocodes have viewport.
          bounds.union(place.geometry.viewport);
        } else {
          bounds.extend(place.geometry.location);
        }
      });
    map.fitBounds(bounds);
  });
}
  </script>
  <input id="pac-input" class="controls" type="text" placeholder="Search Box">
  <div id="map"></div>
  <script src="https://maps.googleapis.com/maps/api/js.erb?key=MAPS_API_KEY&libraries=places&callback=initAutocomplete"
         async defer></script


<% end %>

错误

https://maps.googleapis.com/maps/api/js.erb?key=&libraries=places&callback=initAutocomplete

这就是我所拥有的，如果我直接将密钥放入，它将给我我发布的错误。

<script src="https://maps.googleapis.com/maps/api/js.erb?key=<%= ENV['MAPS_API_KEY'] %>&libraries=places&callback=initAutocomplete"
         async defer></script

最佳答案

这为我工作：

<script async defer src=<%="https://maps.googleapis.com/maps/api/js?key=#{ENV['GOOGLE_MAPS_API_KEY']}&callback=initMap"%> type="text/javascript"></script>

关于javascript - 如何将ENV变量传递到脚本标签中，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36415073/