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javascript - 使用带有 Places 会话令牌的 Javascript 的 Google Places Autocomplete 示例

问题描述

我正在尝试让 Google Places Autocomplete 与会话一起使用，但我在任何地方都找不到使用它们的示例。每次搜索我的 API 计费都获得 10-20 次或更多点击。我想这是每次在搜索框中添加新字母时。据我了解，会话应该对这些进行分组，以便每次搜索只向我收费一次，而不是按输入的字母收费。这个例子还在评论中声明它使用了自动完成小部件，我已经搜索过它的信息，并且它似乎应该自动实现会话。

有没有人有一个示例如何在 javascript 中使用会话来进行 google 地方自动完成调用？或者知道为什么我要为每封信收费？

我正在使用的示例如下。

    <html>
  <head>
    <title>Place Autocomplete Address Form</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <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;
      }
    </style>
    <link type="text/css" rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500">
    <style>
      #locationField, #controls {
        position: relative;
        width: 480px;
      }
      #autocomplete {
        position: absolute;
        top: 0px;
        left: 0px;
        width: 99%;
      }
      .label {
        text-align: right;
        font-weight: bold;
        width: 100px;
        color: #303030;
        font-family: "Roboto";
      }
      #address {
        border: 1px solid #000090;
        background-color: #f0f9ff;
        width: 480px;
        padding-right: 2px;
      }
      #address td {
        font-size: 10pt;
      }
      .field {
        width: 99%;
      }
      .slimField {
        width: 80px;
      }
      .wideField {
        width: 200px;
      }
      #locationField {
        height: 20px;
        margin-bottom: 2px;
      }
    </style>
  </head>

  <body>
    <div id="locationField">
      <input id="autocomplete"
             placeholder="Enter your address"
             onFocus="geolocate()"
             type="text"/>
    </div>

    <!-- Note: The address components in this sample are typical. You might need to adjust them for
               the locations relevant to your app. For more information, see
         https://developers.google.com/maps/documentation/javascript/examples/places-autocomplete-addressform
    -->

    <table id="address">
      <tr>
        <td class="label">Street address</td>
        <td class="slimField"><input class="field" id="street_number" disabled="true"/></td>
        <td class="wideField" colspan="2"><input class="field" id="route" disabled="true"/></td>
      </tr>
      <tr>
        <td class="label">City</td>
        <td class="wideField" colspan="3"><input class="field" id="locality" disabled="true"/></td>
      </tr>
      <tr>
        <td class="label">State</td>
        <td class="slimField"><input class="field" id="administrative_area_level_1" disabled="true"/></td>
        <td class="label">Zip code</td>
        <td class="wideField"><input class="field" id="postal_code" disabled="true"/></td>
      </tr>
      <tr>
        <td class="label">Country</td>
        <td class="wideField" colspan="3"><input class="field" id="country" disabled="true"/></td>
      </tr>
    </table>

    <script>
// This sample uses the Autocomplete widget to help the user select a
// place, then it retrieves the address components associated with that
// place, and then it populates the form fields with those details.
// This sample 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 placeSearch, autocomplete;

var componentForm = {
  street_number: 'short_name',
  route: 'long_name',
  locality: 'long_name',
  administrative_area_level_1: 'short_name',
  country: 'long_name',
  postal_code: 'short_name'
};

function initAutocomplete() {
  // Create the autocomplete object, restricting the search predictions to
  // geographical location types.
  autocomplete = new google.maps.places.Autocomplete(
      document.getElementById('autocomplete'), {types: ['geocode']});

  // Avoid paying for data that you don't need by restricting the set of
  // place fields that are returned to just the address components.
  autocomplete.setFields('address_components');

  // When the user selects an address from the drop-down, populate the
  // address fields in the form.
  autocomplete.addListener('place_changed', fillInAddress);
}

function fillInAddress() {
  // Get the place details from the autocomplete object.
  var place = autocomplete.getPlace();

  for (var component in componentForm) {
    document.getElementById(component).value = '';
    document.getElementById(component).disabled = false;
  }

  // Get each component of the address from the place details,
  // and then fill-in the corresponding field on the form.
  for (var i = 0; i < place.address_components.length; i++) {
    var addressType = place.address_components[i].types[0];
    if (componentForm[addressType]) {
      var val = place.address_components[i][componentForm[addressType]];
      document.getElementById(addressType).value = val;
    }
  }
}

// Bias the autocomplete object to the user's geographical location,
// as supplied by the browser's 'navigator.geolocation' object.
function geolocate() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position) {
      var geolocation = {
        lat: position.coords.latitude,
        lng: position.coords.longitude
      };
      var circle = new google.maps.Circle(
          {center: geolocation, radius: position.coords.accuracy});
      autocomplete.setBounds(circle.getBounds());
    });
  }
}
    </script>
    <script src="https://maps.googleapis.com/maps/api/js?key=#########MY_API_KEY##############&libraries=places&callback=initAutocomplete"
        async defer></script>
  </body>
</html>

标签： javascriptautocomplete

解决方案

据我了解，您必须将 sessionId 放入 src 参考中。像这样：

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

请注意，我在 api 密钥之后添加了&sessiontoken=#### 。

Google 建议使用 UUID 作为会话令牌。以下是从此处获取 UUID 的函数：GooglePlaces Autocomplete

var UUID = (function() {
  var self = {};
  var lut = [];
  for (var i=0; i<256; i++) { lut[i] = (i<16?'0':'')+(i).toString(16); }
  self.generate = function() {
      var d0 = Math.random()*0xffffffff|0;
      var d1 = Math.random()*0xffffffff|0;
      var d2 = Math.random()*0xffffffff|0;
      var d3 = Math.random()*0xffffffff|0;
      return lut[d0&0xff]+lut[d0>>8&0xff]+lut[d0>>16&0xff]+lut[d0>>24&0xff]+'-'+
        lut[d1&0xff]+lut[d1>>8&0xff]+'-'+lut[d1>>16&0x0f|0x40]+lut[d1>>24&0xff]+'-'+
        lut[d2&0x3f|0x80]+lut[d2>>8&0xff]+'-'+lut[d2>>16&0xff]+lut[d2>>24&0xff]+
        lut[d3&0xff]+lut[d3>>8&0xff]+lut[d3>>16&0xff]+lut[d3>>24&0xff];
  }
  return self;
})();

谷歌还有一个 util 端点，它应该给你一个 sessiontoken：require('@google/maps').util.placesAutoCompleteSessionToken()

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