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<!DOCTYPE html>
<html>
  <head>
    <title>Geocoding service</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
​
    <!-- 將map格式的高度改成0%就變成不會將地圖顯示在頁面上了 -->
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 0%;
      }
#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>
    <!-- 註解掉下列的div
    <div id="floating-panel">
      <input id="address" type="textbox" value="台中市南區興大路145號">
      <input id="submit" type="button" value="Geocode">
    </div>
    -->
    <div id="map"></div>
    <!-- 多加了這區 -->
    <div id="warnings_panel" style="width:100%;height:50%;text-align:center"></div>
    <script>
function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 14,
    center: {lat: 24.1241841, lng: 120.6774165}
  });
  var geocoder = new google.maps.Geocoder();
​
  // 註解掉addEventListener,直接將地址當作第三個參數傳遞
  // document.getElementById('submit').addEventListener('click', function() {
    geocodeAddress(geocoder, map, "台中市南區興大路145號");
  // });
}
​
function geocodeAddress(geocoder, resultsMap, address) {  // 增加第三個參數address
  // 註解掉下列這行, 不是讓使用者在頁面上輸入地址, 而是直接接收自參數
  // var address = document.getElementById('address').value;
​
  geocoder.geocode({'address': address}, function(results, status) {
    if (status === google.maps.GeocoderStatus.OK) {
      // 註解掉下列動作, 因為地圖已經不顯示, 所以也沒需要設定中心位置
      // resultsMap.setCenter(results[0].geometry.location);
​
      // 多加了下列兩行之一, 把經緯度座標顯示在warnings_panel或傳回
      document.getElementById('warnings_panel').innerHTML = results[0].geometry.location;
      // return(results[0].geometry.location);
​
      // 註解掉下列動作, 因為地圖已經不顯示, 所以也沒需要標示位置氣球
      // var marker = new google.maps.Marker({
      //   map: resultsMap,
      //   position: results[0].geometry.location
      // });
    } else {
      alert('Geocode was not successful for the following reason: ' + status);
    }
  });
}
​
    </script>
    <script src="https://maps.googleapis.com/maps/api/js?signed_in=true&callback=initMap"
        async defer></script>
  </body>
</html>
Output 300px

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