从输入字段中获取位置并将其传递到 MapBox Map

Question

我正在创建一个网站，该网站获取位置输入（起点和终点）并将其中继到 map，后者又将使用 MapBox API 显示路径。 所以我在这里面临的问题是如何获取输入值并将它们转换为坐标并在 map 上显示它们。 稍后，程序将计算两个端点之间的距离并将其放在那里。

这是我的 HTML 代码，其中包含输入字段：

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src='https://api.mapbox.com/mapbox-gl-js/v2.1.1/mapbox-gl.js'></script>
  <link href='https://api.mapbox.com/mapbox-gl-js/v2.1.1/mapbox-gl.css' rel='stylesheet' />
  <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
  <meta charset="utf-8">
  <title>Distance btw Cities App</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">

  <!-- Bootstrap -->
  <link href="css/bootstrap.min.css" rel="stylesheet">
  <link href="styling.css" rel="stylesheet">
  <link href='https://fonts.googleapis.com/css?family=Arvo' rel='stylesheet' type='text/css'>

  <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
  <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
  <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
</head>

<body>

  <div class="jumbotron">
    <div class="container-fluid">
      <h1>Distance between cities App.</h1>
      <p>Our app will help you calculate travelling distances.</p>
      <form class="form-horizontal">
        <div id='geocoder-container' class="form-group">
          <label for="from" class="col-xs-2 control-label">From:</label>
          <div class="col-xs-10">
            <input type="text" id="from" placeholder="Origin" class="form-control">
          </div>
        </div>
        <div class="form-group">
          <label for="to" class="col-xs-2 control-label">To:</label>
          <div class="col-xs-10">
            <input type="text" id="to" placeholder="Destination" class="form-control">
          </div>
        </div>
      </form>

      <div class="col-xs-offset-2 col-xs-10">
        <button class="btn btn-info btn-lg" onclick="calcRoute();">Submit</button>
      </div>
    </div>
    <div class="container-fluid">
      <div id="googleMap">

      </div>
      <div id="output">

      </div>
    </div>

  </div>

  <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
  <!-- Include all compiled plugins (below), or include individual files as needed -->
  <script src="js/bootstrap.min.js"></script>
  <script
    src="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.5.1/mapbox-gl-geocoder.min.js"></script>
  <link rel="stylesheet"
    href="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.5.1/mapbox-gl-geocoder.css" type="text/css">
  <!-- Promise polyfill script required to use Mapbox GL Geocoder in IE 11 -->

  <script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.min.js"></script>
  <script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.auto.min.js"></script>
  <script src="javascript.js"></script>
</body>

</html>

这是我的 JS 代码：

mapboxgl.accessToken = 'Token';


// Get Current Location
navigator.geolocation.getCurrentPosition(successLocation, errorLocation, { enableHighAccuracy: true })


// Live Coordinates
function successLocation(position) {
    setupMap([position.coords.longitude, position.coords.latitude])
}

// Default Coordinates if location fails
function errorLocation() {
    setupMap([38.189980, 24.023176])
}
// Create Map
function setupMap(center) {
    var map = new mapboxgl.Map({
        container: 'googleMap',
        style: 'mapbox://styles/mapbox/streets-v11',
        center: center,
        zoom: 12,
    })
    // Navigation Controls
    const nav = new mapboxgl.NavigationControl()
    map.addControl(nav)

    var geocoder = new MapboxGeocoder({ accessToken: mapboxgl.accessToken });
    document.getElementById('from').appendChild(geocoder.onAdd(map))
}

另外，我不知道如何告诉程序哪个输入是我的来源，哪个是目的地。 在遵循此代码时， . 这真是一团糟，因为我无法将输入字段作为我的位置查找器。 此位置都不会反映在 map 上。 请有人帮我解决这个问题，这真的很令人沮丧。