未捕获的类型错误：无法读取未定义的属性“搜索框”

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【中文标题】未捕获的类型错误：无法读取未定义的属性“搜索框”【英文标题】：Uncaught TypeError: Cannot read property 'SearchBox' of undefined 【发布时间】：2019-06-18 07:02:04 【问题描述】：

我正在运行谷歌地图的代码，它可以显示公立学校或私立学校，每个学校都有不同的标记，当我运行代码时，它在这一行出现错误：

var searchBox = new google.maps.places.SearchBox(input);

错误是：

我的代码有什么问题？

  <!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Places Search Box</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;


#description 
  font-family: Roboto;
  font-size: 15px;
  font-weight: 300;


#infowindow-content .title 
  font-weight: bold;


#infowindow-content 
  display: none;


#map #infowindow-content 
  display: inline;


.pac-card 
  margin: 10px 10px 0 0;
  border-radius: 2px 0 0 2px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  outline: none;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  background-color: #fff;
  font-family: Roboto;


#pac-container 
  padding-bottom: 12px;
  margin-right: 12px;


.pac-controls 
  display: inline-block;
  padding: 5px 11px;


.pac-controls label 
  font-family: Roboto;
  font-size: 13px;
  font-weight: 300;


#pac-input 
  background-color: #fff;
  font-family: Roboto;
  font-size: 15px;
  font-weight: 300;
  margin-left: 12px;
  padding: 0 11px 0 13px;
  text-overflow: ellipsis;
  width: 400px;


#pac-input:focus 
  border-color: #4d90fe;


#title 
  color: #fff;
  background-color: #4d90fe;
  font-size: 25px;
  font-weight: 500;
  padding: 6px 12px;


#target 
  width: 345px;

</style>
</head>
  <body>
<script src="https://maps.googleapis.com/maps/api/js?key=API_KEY&libraries=places.js"></script>
<input id="pac-input" class="controls" type="text" placeholder="Search Box">
<div id="map"></div>
<script>
function initAutocomplete() 
  var map = new google.maps.Map(document.getElementById('map'), 
    center: 
      lat: -33.8688,
      lng: 151.2195
    ,
    zoom: 13,
    mapTypeId: 'roadmap'
  );

  // Create the search box and link it to the UI element.
  var input = document.getElementById('pac-input');
  var searchBox = new google.maps.places.SearchBox(input);
  map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);

  // Bias the SearchBox results towards current map's viewport.
  map.addListener('bounds_changed', function() 
    searchBox.setBounds(map.getBounds());
  );

  var markers = [];
  // Listen for the event fired when the user selects a prediction and retrieve
  // more details for that place.
  searchBox.addListener('places_changed', function() 
    var places = searchBox.getPlaces();

    if (places.length == 0) 
      return;
    

    // Clear out the old markers.
    markers.forEach(function(marker) 
      marker.setMap(null);
    );
    markers = [];

    // For each place, get the icon, name and location.
    var bounds = new google.maps.LatLngBounds();
    places.forEach(function(place) 
      if (!place.geometry) 
        console.log("Returned place contains no geometry");
        return;
      

      var icons = 
        'Public school': 
          icon: 'http://i68.tinypic.com/xcnnz4.png'
        ,
        'Private school': 
          icon: 'http://i67.tinypic.com/2utkz8k.png'
        
      ;

      // Create a marker for each place.
      markers.push(new google.maps.Marker(
        map: map,
        icon: icon,
        title: place.name,
        position: place.geometry.location
      ));

      if (place.geometry.viewport) 
        // Only geocodes have viewport.
        bounds.union(place.geometry.viewport);
       else 
        bounds.extend(place.geometry.location);
      
    );
    map.fitBounds(bounds);
  );


initAutocomplete();
</script>
 </body>
</html>

【问题讨论】：

这个错误意味着google.maps.places是undefined。不过，这是否正确，我不能说。 How to add a GoogleMap Search Box to my customized map?的可能重复 【参考方案1】：

您需要正确包含places library（“places.js”应该只是“places”）：

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBawDPz1seR1vu-Fw62CDRjmMU6B_oDOZ4&libraries=places.js"></script>

应该是：

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBawDPz1seR1vu-Fw62CDRjmMU6B_oDOZ4&libraries=places"></script>

proof of concept fiddle

代码 sn-p：

#map 
  height: 100%;



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

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


#description 
  font-family: Roboto;
  font-size: 15px;
  font-weight: 300;


#infowindow-content .title 
  font-weight: bold;


#infowindow-content 
  display: none;


#map #infowindow-content 
  display: inline;


.pac-card 
  margin: 10px 10px 0 0;
  border-radius: 2px 0 0 2px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  outline: none;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  background-color: #fff;
  font-family: Roboto;


#pac-container 
  padding-bottom: 12px;
  margin-right: 12px;


.pac-controls 
  display: inline-block;
  padding: 5px 11px;


.pac-controls label 
  font-family: Roboto;
  font-size: 13px;
  font-weight: 300;


#pac-input 
  background-color: #fff;
  font-family: Roboto;
  font-size: 15px;
  font-weight: 300;
  margin-left: 12px;
  padding: 0 11px 0 13px;
  text-overflow: ellipsis;
  width: 400px;


#pac-input:focus 
  border-color: #4d90fe;


#title 
  color: #fff;
  background-color: #4d90fe;
  font-size: 25px;
  font-weight: 500;
  padding: 6px 12px;


#target 
  width: 345px;

<input id="pac-input" class="controls" type="text" placeholder="Search Box">
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=places"></script>    
<script>
  function initAutocomplete() 
    var map = new google.maps.Map(document.getElementById('map'), 
      center: 
        lat: -33.8688,
        lng: 151.2195
      ,
      zoom: 13,
      mapTypeId: 'roadmap'
    );

    // Create the search box and link it to the UI element.
    var input = document.getElementById('pac-input');
    var searchBox = new google.maps.places.SearchBox(input);
    map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);

    // Bias the SearchBox results towards current map's viewport.
    map.addListener('bounds_changed', function() 
      searchBox.setBounds(map.getBounds());
    );

    var markers = [];
    // Listen for the event fired when the user selects a prediction and retrieve
    // more details for that place.
    searchBox.addListener('places_changed', function() 
      var places = searchBox.getPlaces();

      if (places.length == 0) 
        return;
      

      // Clear out the old markers.
      markers.forEach(function(marker) 
        marker.setMap(null);
      );
      markers = [];

      // For each place, get the icon, name and location.
      var bounds = new google.maps.LatLngBounds();
      places.forEach(function(place) 
        if (!place.geometry) 
          console.log("Returned place contains no geometry");
          return;
        

        // Create a marker for each place.
        markers.push(new google.maps.Marker(
          map: map,
          title: place.name,
          position: place.geometry.location
        ));

        if (place.geometry.viewport) 
          // Only geocodes have viewport.
          bounds.union(place.geometry.viewport);
         else 
          bounds.extend(place.geometry.location);
        
      );
      map.fitBounds(bounds);
    );
  

  initAutocomplete();
</script>

【讨论】：

【参考方案2】：

在 api url 中指定回调，以便在加载地点库后运行。在您的 javascript 末尾删除对 initAutocomplete 的调用。

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBawDPz1seR1vu-Fw62CDRjmMU6B_oDOZ4&libraries=places&callback=initAutocomplete" async defer></script>

【讨论】：

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