Google Maps编码字符串显示不正确

问题描述

重写问题以使其对他人有用:使用Google Maps API的encodePoly对我上传到数据库的折线进行编码之后.当我下载，解码并显示时，显示不正确.

Rewriting question to make it useful for others:After using google maps api encodePoly to encode a polyline I uploaded to my database. When I download, decoded and displayed it was displaying incorrectly.

所附图片

我了解到，在对路径进行编码之后以及在发送到POST到数据库之前，我需要立即用\替换\.

What I learned is that I needed to replace the \ with \ immediately after encoding the path and prior to sending to POSTing to the database.

如果下载，则解码并替换为时已晚.现在有道理了.

If you download, decode and then replace it is too late. Which now makes sense.

          function transferRteData(runPath,map) {
                var encodedPath = google.maps.geometry.encoding.encodePath(runPath.getPath());
                encodedPath=encodedPath.replace(/\\/g, "\\\\");
                var data =  {'encodedPath':encodedPath,};

                $.getJSON("{% url 'getfitmappedrte-view' %}", data, function(response){
                    if(response === 'success'){ alert('Yay!'); }
                    else{ alert('Error! :('); }
                });

          } //Close Transfer Data

推荐答案

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编码的折线中的\字符需要转义(使用另一个\，使它们成为\\)

The \ characters in the encoded polyline need to be escaped (with another \, making them \\)

var trythis="mnniGr~|cNHl@Fl@BL??ABABAB?@?B?@@BHp@F`@Ht@L`A@?XW@A@A@?@??@?@@D@RJENEXKlA_@xBs@bA]LCRIXIJCNCrDo@REx@QXE|@QRE??b@hDTfBR|ArAfKVxBLh@bA|HDb@N`Ab@hDF`@Hp@BLHr@Jv@x@bGZ~B\pCd@pD\fC^rCVfBFb@F`@x@fGR|Af@nDPvAF`@LbA^rCHn@Lz@n@tEr@nFp@zENdA^xCZ`CLx@PvAT~AHl@PxAHn@ZrB^tCDPXtBFl@RzABRF`@ZbCJr@Hl@Jn@XnBN|@Hd@BJBHDJDJDLHNDDBFBBBBB@zBhCJNNRNZHVJVHXPlAFh@DXFj@BL@L@J@L@J@N?L@N?J@P?Z?d@EtAA\C`BATAT?RALARAJAHALAHCLEXCFAJCHERERGVo@lCu@|Cg@zBWfA[rA[rAg@rBSz@UhASx@M|@O`AIz@Gv@Ex@Cd@GnBCx@@h@@rA?b@Bn@B^f@rDfAtINbAb@~CXjB"

应该是:

var trythis="mnniGr~|cNHl@Fl@BL??ABABAB?@?B?@@BHp@F`@Ht@L`A@?XW@A@A@?@??@?@@D@RJENEXKlA_@xBs@bA]LCRIXIJCNCrDo@REx@QXE|@QRE??b@hDTfBR|ArAfKVxBLh@bA|HDb@N`Ab@hDF`@Hp@BLHr@Jv@x@bGZ~B\\pCd@pD\\fC^rCVfBFb@F`@x@fGR|Af@nDPvAF`@LbA^rCHn@Lz@n@tEr@nFp@zENdA^xCZ`CLx@PvAT~AHl@PxAHn@ZrB^tCDPXtBFl@RzABRF`@ZbCJr@Hl@Jn@XnBN|@Hd@BJBHDJDJDLHNDDBFBBBBB@zBhCJNNRNZHVJVHXPlAFh@DXFj@BL@L@J@L@J@N?L@N?J@P?Z?d@EtAA\\C`BATAT?RALARAJAHALAHCLEXCFAJCHERERGVo@lCu@|Cg@zBWfA[rA[rAg@rBSz@UhASx@M|@O`AIz@Gv@Ex@Cd@GnBCx@@h@@rA?b@Bn@B^f@rDfAtINbAb@~CXjB"

代码段:

function initialize() {
  var map = new google.maps.Map(
    document.getElementById("map_canvas"), {
      center: new google.maps.LatLng(37.4419, -122.1419),
      zoom: 13,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });
  var polyline = new google.maps.Polyline({
    path: google.maps.geometry.encoding.decodePath("mnniGr~|cNHl@Fl@BL??ABABAB?@?B?@@BHp@F`@Ht@L`A@?XW@A@A@?@??@?@@D@RJENEXKlA_@xBs@bA]LCRIXIJCNCrDo@REx@QXE|@QRE??b@hDTfBR|ArAfKVxBLh@bA|HDb@N`Ab@hDF`@Hp@BLHr@Jv@x@bGZ~B\\pCd@pD\\fC^rCVfBFb@F`@x@fGR|Af@nDPvAF`@LbA^rCHn@Lz@n@tEr@nFp@zENdA^xCZ`CLx@PvAT~AHl@PxAHn@ZrB^tCDPXtBFl@RzABRF`@ZbCJr@Hl@Jn@XnBN|@Hd@BJBHDJDJDLHNDDBFBBBBB@zBhCJNNRNZHVJVHXPlAFh@DXFj@BL@L@J@L@J@N?L@N?J@P?Z?d@EtAA\\C`BATAT?RALARAJAHALAHCLEXCFAJCHERERGVo@lCu@|Cg@zBWfA[rA[rAg@rBSz@UhASx@M|@O`AIz@Gv@Ex@Cd@GnBCx@@h@@rA?b@Bn@B^f@rDfAtINbAb@~CXjB"),
    map: map
  });
  var bounds = new google.maps.LatLngBounds();
  for (var i = 0; i < polyline.getPath().getLength(); i++) {
    bounds.extend(polyline.getPath().getAt(i));
  }
  map.fitBounds(bounds);

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

html,
body,
#map_canvas {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry&key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="map_canvas"></div>

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