如何将ENV变量传递到脚本标记中

Question

我正试图将application.yml文件中的api密钥传递到谷歌地图的js脚本标记中，这可能吗？如果没有，最好的处理方法是什么？此外，我正在使用Figaro-gem来存储ENV变量。提前谢谢。

    <% 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，它给了我我发布的错误，如果我直接输入密钥，它就会起作用。

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

Answer 1

这对我有效：

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

Answer 2

您应该能够使用ERB:将其视为任何其他ENV变量

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

Answer 3

试试这个#{ENV['MAPS_API_KEY']}，我以前也遇到过类似的问题：

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

Answer 4

我想你只是不想把你的api_key放在html标签中，让你的密钥变得脆弱。你可以在你的index.html下尝试下面的代码，它对我有效

<div id="google">
  <script type="text/javascript">
    import {
      GOOGLE_MAP_API
    } from "<the location you save your apikey>";
    function changeSrc() {
      document.getElementById("google").src = `https://maps.googleapis.com/maps/api/js?key=${GOOGLE_MAP_API}`
    }
  </script>
</div>

Answer 5

请注意，如果不是使用Ruby（或Figaro），而是使用Webpack，则可以通过HtmlWebpackPlugin注入它。

Answer 6

您可以使用数据标记来传递env变量

<script id="div" data-key="<%=ENV['MAPS_API_KEY']%>">
  const div = document.getElementById("div");
  console.log(div.dataset.key);
</script>