Google Maps API：从总标记中生成变量

问题描述 投票：0回答：1

很抱歉，如果以前已经回答过。标题时有人警告我，可能会有类似的问题，但是我什么也没找到。我正在基于位置数据执行基于统计的程序，但是我不知道如何实际使用生成的结果作为变量。以下代码是我正在从事的工作的基础，并根据纬度和经度提供了多达60家附近的餐馆。有什么方法可以将生成的标记总数作为一个变量，然后将其转换为可以在其他内容中引用的变量，例如HTML表或其他可引用变量的类似项目？另外，提供的API应该可以使用，但是您可能需要自己的API密钥。

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Place search pagination</title>
    <style>
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }
      /* Optional: Makes the sample page fill the window. */
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #right-panel {
        font-family: 'Roboto','sans-serif';
        line-height: 30px;
        padding-left: 10px;
      }

      #right-panel select, #right-panel input {
        font-size: 15px;
      }

      #right-panel select {
        width: 100%;
      }

      #right-panel i {
        font-size: 12px;
      }
      #right-panel {
        font-family: Arial, Helvetica, sans-serif;
        position: absolute;
        right: 5px;
        top: 60%;
        margin-top: -195px;
        height: 330px;
        width: 200px;
        padding: 5px;
        z-index: 5;
        border: 1px solid #999;
        background: #fff;
      }
      h2 {
        font-size: 22px;
        margin: 0 0 5px 0;
      }
      ul {
        list-style-type: none;
        padding: 0;
        margin: 0;
        height: 271px;
        width: 200px;
        overflow-y: scroll;
      }
      li {
        background-color: #f1f1f1;
        padding: 10px;
        text-overflow: ellipsis;
        white-space: nowrap;
        overflow: hidden;
      }
      li:nth-child(odd) {
        background-color: #fcfcfc;
      }
      #more {
        width: 100%;
        margin: 5px 0 0 0;
      }
    </style>
    <script>
      // This example requires the Places library. Include the libraries=places
      // parameter when you first load the API. For example:
      // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">

      var map;

      function initMap() {
        // Create the map.
        var pyrmont = {lat: -33.866, lng: 151.196};
        map = new google.maps.Map(document.getElementById('map'), {
          center: pyrmont,
          zoom: 17
        });

        // Create the places service.
        var service = new google.maps.places.PlacesService(map);
        var getNextPage = null;
        var moreButton = document.getElementById('more');
        moreButton.onclick = function() {
          moreButton.disabled = true;
          if (getNextPage) getNextPage();
        };

        // Perform a nearby search.
        service.nearbySearch(
            {location: pyrmont, radius: 500, type: ['restaurants']},
            function(results, status, pagination) {
              if (status !== 'OK') return;

              createMarkers(results);
              moreButton.disabled = !pagination.hasNextPage;
              getNextPage = pagination.hasNextPage && function() {
                pagination.nextPage();
              };
            });
      }

      function createMarkers(places) {
        var bounds = new google.maps.LatLngBounds();
        var placesList = document.getElementById('places');

        for (var i = 0, place; place = places[i]; i++) {
          var image = {
            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)
          };

          var marker = new google.maps.Marker({
            map: map,

            title: place.name,
            position: place.geometry.location
          });

          var li = document.createElement('li');
          li.textContent = place.name;
          placesList.appendChild(li);
          document.getElementById('number_results').innerHTML = placesList.children.length + " returned";

          bounds.extend(place.geometry.location);
        }
        map.fitBounds(bounds);
      }
    </script>
  </head>
  <body>
    <div id="map"></div>
    <div id="right-panel">
      <h2>Results</h2>
      <div id="number_results"></div>
      <ul id="places"></ul>
      <button id="more">More results</button>
    </div>
    <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBYoCkx3owRBY3uLwBvW36B0GNeMQtBm1o&libraries=places&callback=initMap" async defer></script>
  </body>
</html>

代码段：

// This example requires the Places library. Include the libraries=places
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">

var map;

function initMap() {
  // Create the map.
  var pyrmont = {
    lat: -33.866,
    lng: 151.196
  };
  map = new google.maps.Map(document.getElementById('map'), {
    center: pyrmont,
    zoom: 17
  });

  // Create the places service.
  var service = new google.maps.places.PlacesService(map);
  var getNextPage = null;
  var moreButton = document.getElementById('more');
  moreButton.onclick = function() {
    moreButton.disabled = true;
    if (getNextPage) getNextPage();
  };

  // Perform a nearby search.
  service.nearbySearch({
      location: pyrmont,
      radius: 500,
      type: ['restaurants']
    },
    function(results, status, pagination) {
      if (status !== 'OK') return;

      createMarkers(results);
      moreButton.disabled = !pagination.hasNextPage;
      getNextPage = pagination.hasNextPage && function() {
        pagination.nextPage();
      };
    });
}

function createMarkers(places) {
  var bounds = new google.maps.LatLngBounds();
  var placesList = document.getElementById('places');

  for (var i = 0, place; place = places[i]; i++) {
    var image = {
      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)
    };

    var marker = new google.maps.Marker({
      map: map,

      title: place.name,
      position: place.geometry.location
    });

    var li = document.createElement('li');
    li.textContent = place.name;
    placesList.appendChild(li);
    document.getElementById('number_results').innerHTML = placesList.children.length + " returned";

    bounds.extend(place.geometry.location);
  }
  map.fitBounds(bounds);
}
/* Always set the map height explicitly to define the size of the div
           * element that contains the map. */

#map {
  height: 100%;
}


/* Optional: Makes the sample page fill the window. */

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

#right-panel {
  font-family: 'Roboto', 'sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#right-panel select,
#right-panel input {
  font-size: 15px;
}

#right-panel select {
  width: 100%;
}

#right-panel i {
  font-size: 12px;
}

#right-panel {
  font-family: Arial, Helvetica, sans-serif;
  position: absolute;
  right: 5px;
  top: 60%;
  margin-top: -195px;
  height: 330px;
  width: 200px;
  padding: 5px;
  z-index: 5;
  border: 1px solid #999;
  background: #fff;
}

h2 {
  font-size: 22px;
  margin: 0 0 5px 0;
}

ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  height: 271px;
  width: 200px;
  overflow-y: scroll;
}

li {
  background-color: #f1f1f1;
  padding: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

li:nth-child(odd) {
  background-color: #fcfcfc;
}

#more {
  width: 100%;
  margin: 5px 0 0 0;
}
<div id="map"></div>
<div id="right-panel">
  <h2>Results</h2>
  <div id="number_results"></div>
  <ul id="places"></ul>
  <button id="more">More results</button>
</div>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=places&callback=initMap" async defer></script>

编辑：为了使回答更简单，我在下面添加了一个更完整的html版本。 （它有一些问题，例如地图未更新其标记，但这完全是一个单独的问题）。我在此代码的底部添加了一个表，该表具有以下短语“; document.getElementById（” val“）。innerHTML =”基于您的纬度“ + lat +”和经度“ + lng +”，库的总数为：“ + SomethingSomethingSomething +”。但是我不知道如何从结果中获取变量以供参考。

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>Base Mapper V2</title>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <meta name="robots" content="noindex, nofollow">
  <meta name="googlebot" content="noindex, nofollow">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script type="text/javascript" src="/js/lib/dummy.js"></script>
  <link rel="stylesheet" type="text/css" href="/css/result-light.css">
  <style id="compiled-css" type="text/css">
#map {
  height: 100%;
}

html,
body {
  height: 100%;
  margin: 0;
  padding-top: 10px;
  padding-left: 10px;
  padding-right: 10px;
  background-color: #fff
}

#right-panel {
  font-family: 'Roboto', 'sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#right-panel select,
#right-panel input {
  font-size: 15px;
}

#right-panel select {
  width: 100%;
}

#right-panel i {
  font-size: 12px;
}

#right-panel {
  font-family: Arial, Helvetica, sans-serif;
  position: absolute;
  right: 5px;
  top: 60%;
  margin-top: -395px;
  height: 650px;
  width: 200px;
  padding: 10px;
  padding-left: 10px;
  z-index: 10;
  border: 1px solid #999;
  background: #fff;
}

h2 {
  font-size: 23px;
  margin: 0 0 5px 0;
}

ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  height: 580px;
  width: 200px;
  overflow-y: scroll;
}

li {
  background-color: #ffc965;
  padding: 5px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

li:nth-child(odd) {
  background-color: #fff065;
}

#more {
  width: 100%;
  margin: 5px 0 0 0;
}

input[type=text],
select {
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
  background-color: #ffefe5
}

.container {
  border-radius: 5px;
  background-color: #fff
  padding: 80px;
  width: 80%
}
button {
    width: 100%;
    background-color: #8f20b6;
    color: white;
    padding: 14px 20px;
    margin: 8px 0;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #cba00d;
}
table {
    width: 100%;
    background-color: #8f20b6;
    color: white;
    padding: 25px 0px;
    margin: 8px 0;
    border: none;
    cursor: pointer;
}

  </style>
</head>
<body>
    <div class="container">
  <form id="mapCenterForm" action="" onsubmit="return false;">
    <label for="latitude">lat</label>
    <input type="text" id="lat" name="latitude" placeholder="0.000000">

    <label for="longitude">lng</label>
    <input type="text" id="lng" name="longitude" placeholder="0.000000">
    <br>
    <button onclick="change_center(); return false">
      Submit
    </button>
  </form>
  <div id="map" style="height: 500px"></div>

</div>
<div id="right-panel">
  <h2>Locations</h2>
  <div id="number_results"></div>
  <ul id="places"></ul>
  <button id="more">More Results</button>
</div>
<script src="https://maps.googleapis.com/maps/api/js?libraries=places&key=AIzaSyBYoCkx3owRBY3uLwBvW36B0GNeMQtBm1o&callback=initMap" async defer></script>

  <script type="text/javascript">


var red_icon = 'http://maps.google.com/mapfiles/ms/icons/red-dot.png';
var map;
var lat = 41.18076;
var lng = -73.20537;

function initMap() {
  // Create the map.
  var SET = {
    lat: lat,
    lng: lng
  };
  map = new google.maps.Map(document.getElementById('map'), {
    center: SET,
    zoom: 13
  });
  google.maps.event.addListener(map, 'click', function(e) {
    document.getElementById('lat').value = e.latLng.lat();
    document.getElementById('lng').value = e.latLng.lng();
  })

  // Create the places service.
  var service = new google.maps.places.PlacesService(map);
  var getNextPage = null;
  var moreButton = document.getElementById('more');
  moreButton.onclick = function() {
    moreButton.disabled = true;
    if (getNextPage) getNextPage();
  };

  // Perform a nearby search.
  service.nearbySearch({
      location: SET,
      radius: 9500,
      keyword: "library"
    },

    function(results, status, pagination) {
      if (status !== 'OK') return;

      createMarkers(results);
      moreButton.disabled = !pagination.hasNextPage;
      getNextPage = pagination.hasNextPage && function() {
        pagination.nextPage();
      };
    });
}

function createMarkers(places) {
  var bounds = new google.maps.LatLngBounds();
  var placesList = document.getElementById('places');

  for (var i = 0, place; place = places[i]; i++) {
    var image = {
      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)
    };

    var marker = new google.maps.Marker({
      map: map,
      icon: red_icon,
      title: place.name,
      position: place.geometry.location
    });

    var li = document.createElement('li');
    li.textContent = place.name;
    placesList.appendChild(li);
    document.getElementById('number_results').innerHTML = placesList.children.length+" returned";
    bounds.extend(place.geometry.location);
    var spookRating1= li*100
  }
  map.fitBounds(bounds);
}

function change_center() {
  var newLat = parseFloat(document.getElementById("lat").value);
  var newLng = parseFloat(document.getElementById("lng").value);

  map.setCenter({
    lat: newLat,
    lng: newLng
  });
  return false;
}

  </script>

  <script>
    // tell the embed parent frame the height of the content
    if (window.parent && window.parent.parent){
      window.parent.parent.postMessage(["resultsFrame", {
        height: document.body.getBoundingClientRect().height,
        slug: "r96szuhx"
      }], "*")
    }

    // always overwrite window.name, in case users try to set it manually
    window.name = "result"
  </script>
  <table>
  <tr><th id="val"></th></tr>
  </table>
  <script type="text/javascript" font=24>
  document.getElementById("val").innerHTML = "Based on your latitude of "+lat+" and longitude of "+lng+", the total number of libraries are: "+results.length+".";
  </script>
</body>
</html>
html api google-maps counter
1个回答
0
投票

[document.getElementById('places').children.length将包含显示的结果数（第一个请求最多20个，最多3个请求最多60个）。

这将更新您的表：

document.getElementById("val").innerHTML = "Based on your latitude of " + lat + " and longitude of " + lng + ", the total number of libraries are: " + document.getElementById('places').children.length + ".";

但是您需要在响应返回时调用它（在createMarkers函数起作用时：]

function createMarkers(places) {
  var bounds = new google.maps.LatLngBounds();
  var placesList = document.getElementById('places');

  for (var i = 0, place; place = places[i]; i++) {
    var image = {
      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)
    };

    var marker = new google.maps.Marker({
      map: map,
      icon: red_icon,
      title: place.name,
      position: place.geometry.location
    });

    var li = document.createElement('li');
    li.textContent = place.name;
    placesList.appendChild(li);
    document.getElementById('number_results').innerHTML = placesList.children.length + " returned";
    bounds.extend(place.geometry.location);
    var spookRating1 = li * 100
  }
  map.fitBounds(bounds);
  document.getElementById("val").innerHTML = "Based on your latitude of " + lat + " and longitude of " + lng + ", the total number of libraries are: " + document.getElementById('places').children.length + ".";
}

screenshot of resulting map (after clicking "more results" once)

代码段：

#map {
  height: 100%;
}

html,
body {
  height: 100%;
  margin: 0;
  padding-top: 10px;
  padding-left: 10px;
  padding-right: 10px;
  background-color: #fff
}

#right-panel {
  font-family: 'Roboto', 'sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#right-panel select,
#right-panel input {
  font-size: 15px;
}

#right-panel select {
  width: 100%;
}

#right-panel i {
  font-size: 12px;
}

#right-panel {
  font-family: Arial, Helvetica, sans-serif;
  position: absolute;
  right: 5px;
  top: 60%;
  margin-top: -395px;
  height: 650px;
  width: 200px;
  padding: 10px;
  padding-left: 10px;
  z-index: 10;
  border: 1px solid #999;
  background: #fff;
}

h2 {
  font-size: 23px;
  margin: 0 0 5px 0;
}

ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  height: 580px;
  width: 200px;
  overflow-y: scroll;
}

li {
  background-color: #ffc965;
  padding: 5px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

li:nth-child(odd) {
  background-color: #fff065;
}

#more {
  width: 100%;
  margin: 5px 0 0 0;
}

input[type=text],
select {
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
  background-color: #ffefe5
}

.container {
  border-radius: 5px;
  background-color: #fff padding: 80px;
  width: 80%
}

button {
  width: 100%;
  background-color: #8f20b6;
  color: white;
  padding: 14px 20px;
  margin: 8px 0;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #cba00d;
}

table {
  width: 100%;
  background-color: #8f20b6;
  color: white;
  padding: 25px 0px;
  margin: 8px 0;
  border: none;
  cursor: pointer;
}
<div class="container">
  <form id="mapCenterForm" action="" onsubmit="return false;">
    <label for="latitude">lat</label>
    <input type="text" id="lat" name="latitude" placeholder="0.000000">

    <label for="longitude">lng</label>
    <input type="text" id="lng" name="longitude" placeholder="0.000000">
    <br>
    <button onclick="change_center(); return false">
      Submit
    </button>
  </form>
  <div id="map" style="height: 500px"></div>

</div>
<div id="right-panel">
  <h2>Locations</h2>
  <div id="number_results"></div>
  <ul id="places"></ul>
  <button id="more">More Results</button>
</div>
<script src="https://maps.googleapis.com/maps/api/js?libraries=places&key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap" async defer></script>

<script type="text/javascript">
  var red_icon = 'http://maps.google.com/mapfiles/ms/icons/red-dot.png';
  var map;
  var lat = 41.18076;
  var lng = -73.20537;

  function initMap() {
    // Create the map.
    var SET = {
      lat: lat,
      lng: lng
    };
    map = new google.maps.Map(document.getElementById('map'), {
      center: SET,
      zoom: 13
    });
    google.maps.event.addListener(map, 'click', function(e) {
      document.getElementById('lat').value = e.latLng.lat();
      document.getElementById('lng').value = e.latLng.lng();
    })

    // Create the places service.
    var service = new google.maps.places.PlacesService(map);
    var getNextPage = null;
    var moreButton = document.getElementById('more');
    moreButton.onclick = function() {
      moreButton.disabled = true;
      if (getNextPage) getNextPage();
    };

    // Perform a nearby search.
    service.nearbySearch({
        location: SET,
        radius: 9500,
        keyword: "library"
      },

      function(results, status, pagination) {
        if (status !== 'OK') return;

        createMarkers(results);
        moreButton.disabled = !pagination.hasNextPage;
        getNextPage = pagination.hasNextPage && function() {
          pagination.nextPage();
        };
      });
  }

  function createMarkers(places) {
    var bounds = new google.maps.LatLngBounds();
    var placesList = document.getElementById('places');

    for (var i = 0, place; place = places[i]; i++) {
      var marker = new google.maps.Marker({
        map: map,
        icon: red_icon,
        title: place.name,
        position: place.geometry.location
      });

      var li = document.createElement('li');
      li.textContent = place.name;
      placesList.appendChild(li);
      document.getElementById('number_results').innerHTML = placesList.children.length + " returned";
      bounds.extend(place.geometry.location);
      var spookRating1 = li * 100
    }
    map.fitBounds(bounds);
    document.getElementById("val").innerHTML = "Based on your latitude of " + lat + " and longitude of " + lng + ", the total number of libraries are: " + document.getElementById('places').children.length + ".";
  }

  function change_center() {
    var newLat = parseFloat(document.getElementById("lat").value);
    var newLng = parseFloat(document.getElementById("lng").value);

    map.setCenter({
      lat: newLat,
      lng: newLng
    });
    return false;
  }
</script>

<table>
  <tr>
    <th id="val"></th>
  </tr>
</table>
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