如何通过DirectionsRenderer启用Bicycling图层后将其关闭

问题描述

在 Google Maps API中有关图层的文档中，以下内容是说:

在DirectionsRenderer将其打开后，如何关闭此Bicycling层?我确实想显示骑行路线，但不想让骑行层的所有绿线弄乱地图的清晰度.

How would one turn off this Bicycling Layer after it got turned on by the DirectionsRenderer? I do want to show the biking route, but don't want all the green lines of the Bicycling Layer mess up the clarity of the map.

是否有办法获取"当前的骑行图层"，并以这种方式将其关闭/从地图上取消绑定?

Is there a way to 'get' the current Bicycling Layer, and turn it off/unbind it from the map that way?

推荐答案

只需按照有关DirectionsRendererOptions的文档，您可以通过使用DirectionsRendererOptions中的suppressBicyclingLayer选项来隐藏BicycleLayer:

Just disable the display of the bicyclingLayer by the DirectionsRenerer, per the documentation for the DirectionsRendererOptions you can suppress the BicycleLayer by using the suppressBicyclingLayer option in the DirectionsRendererOptions:

概念证明小提琴

代码段:

function initMap() {
  var directionsService = new google.maps.DirectionsService;
  var directionsDisplay = new google.maps.DirectionsRenderer({
    suppressBicyclingLayer: true
  });
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 7,
    center: {
      lat: 41.85,
      lng: -87.65
    }
  });
  directionsDisplay.setMap(map);

  var onChangeHandler = function() {
    calculateAndDisplayRoute(directionsService, directionsDisplay);
  };
  calculateAndDisplayRoute(directionsService, directionsDisplay);
}

function calculateAndDisplayRoute(directionsService, directionsDisplay) {
  directionsService.route({
    origin: document.getElementById('start').value,
    destination: document.getElementById('end').value,
    travelMode: 'BICYCLING'
  }, function(response, status) {
    if (status === 'OK') {
      directionsDisplay.setDirections(response);
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto', 'sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

<div id="floating-panel">
  <b>Start: </b>
  <input id="start" value="New York, NY" />
  <br><b>End: </b>
  <input id="end" value="Newark, NJ" />
</div>
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer src="https://maps.googleapis.com/maps/api/js?callback=initMap">
</script>

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