用于编辑谷歌地图折线的事件处理程序？答案

【问题标题】：Event handler for editing a Google Maps Polyline?用于编辑谷歌地图折线的事件处理程序？
【发布时间】：2013-03-19 13:18:21
【问题描述】：

我正在寻找一个在您在 Google 地图中编辑折线时触发的事件，类似于标记上的“拖动”事件。我找到了 'capturing_changed' 事件，但它似乎在 dragstart 和 dragend 上触发，而不是在 drag 上触发。因为我不得不重新发明轮子，允许拖动标记并根据标记的位置更新折线，基本上是重新发明可编辑的折线。我希望能够添加标记，可编辑的折线可以顺利完成，但我必须能够在拖动时检测到。我在 API 文档或 Google 搜索中找不到任何内容，所以我想我会在这里问。

【问题讨论】：

标签： javascript google-maps event-handling google-maps-markers google-polyline

【解决方案1】：

simple Polyline example from the documentation 修改为添加更改事件（insert_at、remove_at、set_at、dragend）。

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Google Maps JavaScript API v3 Example: Polyline Simple</title>
    <link href="/maps/documentation/javascript/examples/default.css" rel="stylesheet">
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
    <script>
var flightPath = null;

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

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

        var 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)
        ];
        flightPath = new google.maps.Polyline({
          path: flightPlanCoordinates,
          strokeColor: '#FF0000',
          strokeOpacity: 1.0,
          strokeWeight: 2,
          editable: true,
          draggable: true
        });
        google.maps.event.addListener(flightPath, "dragend", getPath);
        google.maps.event.addListener(flightPath.getPath(), "insert_at", getPath);
        google.maps.event.addListener(flightPath.getPath(), "remove_at", getPath);
        google.maps.event.addListener(flightPath.getPath(), "set_at", getPath);
        flightPath.setMap(map);
      }

function getPath() {
   var path = flightPath.getPath();
   var len = path.getLength();
   var coordStr = "";
   for (var i=0; i<len; i++) {
     coordStr += path.getAt(i).toUrlValue(6)+"<br>";
   }
   document.getElementById('path').innerHTML = coordStr;
}

    </script>
  </head>
  <body onload="initialize()">
    <div id="map-canvas" style="height:500px; width:600px;"></div>
    <div id="path"></div>
  </body>
</html>

working example

代码 sn-p：

var flightPath = null;

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

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

  var 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)
  ];
  flightPath = new google.maps.Polyline({
    path: flightPlanCoordinates,
    strokeColor: '#FF0000',
    strokeOpacity: 1.0,
    strokeWeight: 2,
    editable: true,
    draggable: true
  });
  google.maps.event.addListener(flightPath, "dragend", getPath);
  google.maps.event.addListener(flightPath.getPath(), "insert_at", getPath);
  google.maps.event.addListener(flightPath.getPath(), "remove_at", getPath);
  google.maps.event.addListener(flightPath.getPath(), "set_at", getPath);
  flightPath.setMap(map);
}

function getPath() {
  var path = flightPath.getPath();
  var len = path.getLength();
  var coordStr = "";
  for (var i = 0; i < len; i++) {
    coordStr += path.getAt(i).toUrlValue(6) + "<br>";
  }
  document.getElementById('path').innerHTML = coordStr;
}
google.maps.event.addDomListener(window, 'load', initialize);

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="path"></div>
<div id="map-canvas" style="height:500px; width:600px;"></div>

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