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<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Directions service (complex)</title>
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 50%;
      }
      #warnings-panel {
        width: 100%;
        height:10%;
        text-align: center;
      }
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
​
    </style>
  </head>
  <body>
    <div id="floating-panel">
    <b>Start: </b>
    <select id="start">
      <option value="22.620695, 120.29371">高雄女中站</option>
      <option value="22.624798, 120.3010259">中央公園站</option>
      <option value="22.622917, 120.289218">高雄電影館站</option>
      <option value="22.623908, 120.290549">國賓飯店站</option>
      <option value="22.610307, 120.299225">新光成功站</option>
      <option value="22.614298, 120.304327">三多商圈站</option>
      <option value="22.622842, 120.283391">鹽埕埔站</option>
      <option value="22.622197, 120.275531">西子灣站</option>
    </select>
    <b>End: </b>
    <select id="end">
      <option value="22.617397, 120.293292">光榮碼頭(黃色小鴨)</option>
      <option value="22.620665, 120.291561">玫瑰聖母堂</option>
      <option value="22.624202, 120.290291">水漾愛河</option>
      <option value="22.622638, 120.289279">愛河親水徒步區</option>
      <option value="22.618843, 120.289900">珍愛碼頭</option>
      <option value="22.60978, 120.296928">新光碼頭</option>
      <option value="22.613801, 120.295881">陳中和紀念館</option>
      <option value="22.620312, 120.282036">駁二藝術特區</option>
      <option value="22.618768, 120.278137">河邊香蕉碼頭</option>
      <option value="22.619242, 120.276107">漁人碼頭</option>
      <option value="22.621802, 120.2753109">打狗鐵道故事館</option>
      <option value="22.624549, 120.272155">武德殿</option>
      <option value="22.619764, 120.27021">鼓山渡輪(海之冰)</option>
    </select>
    </div>
    <div id="map"></div>
    &nbsp;
    <div id="warnings-panel"></div>
    <script>
function initMap() {
  var markerArray = [];
​
  // Instantiate a directions service.
  var directionsService = new google.maps.DirectionsService;
​
  // Create a map and center it.
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 15,
    center: {lat: 22.618794, lng: 120.293006}
  });
​
  // Create a renderer for directions and bind it to the map.
  var directionsDisplay = new google.maps.DirectionsRenderer({map: map});
​
  // Instantiate an info window to hold step text.
  var stepDisplay = new google.maps.InfoWindow;
​
  // Display the route between the initial start and end selections.
  calculateAndDisplayRoute(
      directionsDisplay, directionsService, markerArray, stepDisplay, map);
  // Listen to change events from the start and end lists.
  var onChangeHandler = function() {
    calculateAndDisplayRoute(
        directionsDisplay, directionsService, markerArray, stepDisplay, map);
  };
  document.getElementById('start').addEventListener('change', onChangeHandler);
  document.getElementById('end').addEventListener('change', onChangeHandler);
}
​
function calculateAndDisplayRoute(directionsDisplay, directionsService,
    markerArray, stepDisplay, map) {
  // First, remove any existing markers from the map.
  for (var i = 0; i < markerArray.length; i++) {
    markerArray[i].setMap(null);
  }
​
  // Retrieve the start and end locations and create a DirectionsRequest using
  // WALKING directions.
  directionsService.route({
    origin: document.getElementById('start').value,
    destination: document.getElementById('end').value,
    travelMode: google.maps.TravelMode.WALKING
  }, function(response, status) {
    // Route the directions and pass the response to a function to create
    // markers for each step.
    if (status === google.maps.DirectionsStatus.OK) {
      document.getElementById('warnings-panel').innerHTML =
          '<b>' + response.routes[0].warnings + '</b>';
      directionsDisplay.setDirections(response);
      showSteps(response, markerArray, stepDisplay, map);
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
}
​
function showSteps(directionResult, markerArray, stepDisplay, map) {
  // For each step, place a marker, and add the text to the marker's infowindow.
  // Also attach the marker to an array so we can keep track of it and remove it
  // when calculating new routes.
  var myRoute = directionResult.routes[0].legs[0];
  
  document.getElementById('warnings-panel').innerHTML = '';     // 先清空warnings_panel內容文字
​
  for (var i = 0; i < myRoute.steps.length; i++) {
    var marker = markerArray[i] = markerArray[i] || new google.maps.Marker;
    marker.setMap(map);
    marker.setPosition(myRoute.steps[i].start_location);
    attachInstructionText(
        stepDisplay, marker, myRoute.steps[i].instructions, map);
​
    // 在warnings_panel呈現導航路段的各種參數, 語法參閱 https://developers.google.com/maps/documentation/javascript/directions?hl=zh-tw#DirectionsResults 
    document.getElementById('warnings-panel').innerHTML += '<br />路段指示: ' + myRoute.steps[i].instructions  + '<br />路段距離: ' + myRoute.steps[i].distance.value  + '公尺<br />路段時程: ' + myRoute.steps[i].duration.value  + '秒<br />路段起點: ' + myRoute.steps[i].start_location  + '<br />路段終點: ' + myRoute.steps[i].end_location  + '<br />';
  }
}
​
function attachInstructionText(stepDisplay, marker, text, map) {
  google.maps.event.addListener(marker, 'click', function() {
    // Open an info window when the marker is clicked on, containing the text
    // of the step.
    stepDisplay.setContent(text);
    stepDisplay.open(map, marker);
  });
}
​
    </script>
    <script src="https://maps.googleapis.com/maps/api/js?signed_in=true&callback=initMap"
        async defer></script>
  </body>
</html>
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