Google 地图添加删除折线

Question

我对 Google 地图中的 'removing Polylines' 有疑问。在本文档中解释了如何添加或删除多段线。 (https://developers.google.com/maps/documentation/javascript/examples/polyline-remove?hl=de)

但我的情况有点不同。我有一个 'addPolyline' 函数，可以在 Google 地图上添加折线。有了这个功能，我可以添加折线，所以我可以 return 'polyline Object'，但我不能用同样的方法删除这个折线。

如果你点击'addLines'，它可以画一条线，但如果我点击removeLine，它不会被删除。

var map;
var flightPlanCoordinates;

function addPolyline(el){
    polyName = new google.maps.Polyline({
        path: el,
        strokeColor: '#FF0000',
        strokeOpacity: 1.0,
        strokeWeight: 2
  });
   return polyName;
}


function initialize() {
  var mapOptions = {
    zoom: 3,
    center: new google.maps.LatLng(0, -180),
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };

  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  flightPlanCoordinates = [
    new google.maps.LatLng(37.772323, -122.214897),
    new google.maps.LatLng(21.291982, -157.821856),
    new google.maps.LatLng(-18.142599, 178.431),
    new google.maps.LatLng(-27.46758, 153.027892)
  ];  
}

function addLine(el) {
  el.setMap(map);
}

function removeLine(el) {
  el.setMap(null);
}

google.maps.event.addDomListener(window, 'load', initialize);

这是Fiddle：http://jsfiddle.net/aldimeola1122/gna00zwb/

我怎样才能做到这一点，你能帮帮我吗？提前致谢。

Answer 1

您正在创建一条新的多段线，然后将其删除。

<input onclick="removeLine(addPolyline(flightPlanCoordinates));" type=button value="Remove line">

如果要删除现有折线，需要保留对它的引用。

<input onclick="removeLine(polyline);" type=button value="Remove line">
<input onclick="polyline=addLine(addPolyline(flightPlanCoordinates));" type=button value="Add line">

working fiddle

var map;
var flightPlanCoordinates;
var polyline;

function addPolyline(el) {
  polyName = new google.maps.Polyline({
    path: el,
    strokeColor: '#FF0000',
    strokeOpacity: 1.0,
    strokeWeight: 2
  });
  return polyName;
}


function initialize() {
  var mapOptions = {
    zoom: 3,
    center: new google.maps.LatLng(0, -180),
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };

  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  flightPlanCoordinates = [
    new google.maps.LatLng(37.772323, -122.214897),
    new google.maps.LatLng(21.291982, -157.821856),
    new google.maps.LatLng(-18.142599, 178.431),
    new google.maps.LatLng(-27.46758, 153.027892)
  ];
}

function addLine(el) {
  el.setMap(map);
  return el;
}

function removeLine(el) {
  el.setMap(null);
}

google.maps.event.addDomListener(window, 'load', initialize);

html,
body,
#map-canvas {
  height: 100%;
  margin: 0px;
  padding: 0px
}
#panel {
  position: absolute;
  top: 5px;
  left: 50%;
  margin-left: -180px;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
}

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="panel">
  <input onclick="removeLine(polyline);" type=button value="Remove line">
  <input onclick="polyline=addLine(addPolyline(flightPlanCoordinates));" type=button value="Add line">
</div>
<div id="map-canvas"></div>

Google 地图添加删除折线

Google Maps add remove Polyline

google-maps

google-maps-api-3

polyline

google-polyline