Question

我正在为学校编写一个项目。我已经在页面加载时包含了地理定位的代码。需要有一个下拉框来显示另外三个位置。我还包括编码下拉框。我想要更改map_canvas id我需要包含if语句，其中包含我为沃尔特迪斯尼世界，檀香山和巴黎提供的谷歌地图。我不确定如何编写此if语句以更改基于选择显示的地图图像。这就是我所拥有的：

CSS

html{ 
    height: 90% 
}
body{ 
    height: 100%; 
    margin: 0px; 
    padding: 0px; 
}
#map_canvas{ 
    height: 90%; 
    width: 90%; 
}

JS

var watchID;
var geo; // for the geolocation object
var map; // for the google map object
var mapMarker; // the google map marker object

// position options
var MAXIMUM_AGE = 200; // miliseconds
var TIMEOUT = 300000;
var HIGHACCURACY = true;

function getGeoLocation() {
  try {
    if (!!navigator.geolocation) return navigator.geolocation;
    else return undefined;
  } catch (e) {
    return undefined;
  }
}

function show_map(position) {
  var lat = position.coords.latitude;
  var lon = position.coords.longitude;
  var latlng = new google.maps.LatLng(lat, lon);

  if (map) {
    map.panTo(latlng);
    mapMarker.setPosition(latlng);
  } else {
    var myOptions = {
      zoom: 18,
      center: latlng,

      // mapTypeID --
      // ROADMAP displays the default road map view
      // SATELLITE displays Google Earth satellite images
      // HYBRID displays a mixture of normal and satellite views
      // TERRAIN displays a physical map based on terrain information.
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
    map.setTilt(0); // turns off the annoying default 45-deg view

    mapMarker = new google.maps.Marker({
      position: latlng,
      title: "You are here."
    });
    mapMarker.setMap(map);
  }
}

function geo_error(error) {
  stopWatching();
  switch (error.code) {
    case error.TIMEOUT:
      alert('Geolocation Timeout');
      break;
    case error.POSITION_UNAVAILABLE:
      alert('Geolocation Position unavailable');
      break;
    case error.PERMISSION_DENIED:
      alert('Geolocation Permission denied');
      break;
    default:
      alert('Geolocation returned an unknown error code: ' + error.code);
  }
}

function stopWatching() {
  if (watchID) geo.clearWatch(watchID);
  watchID = null;
}

function startWatching() {
  watchID = geo.watchPosition(show_map, geo_error, {
    enableHighAccuracy: HIGHACCURACY,
    maximumAge: MAXIMUM_AGE,
    timeout: TIMEOUT
  });
}

window.onload = function() {
  if ((geo = getGeoLocation())) {
    startWatching();
  } else {
    alert('Geolocation not supported.')
  }
}

HTML

 <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>
<div id="map_canvas"></div>
<section>
  <div id="vacationLocations">
    <h2>Vacation Locations</h2>
    <form name="tripSelection" method="post" method="get">
      <div class="formRow">
        <label for="serviceSelection">
          Trip Selection</label>
        <select name="tripSelection" id="tripSelection" class="validated" required>
          <option value="">-Select One-</option>
          <option value="1">Paris, France</option>
          <option value="2">Honolulu, Hawaii</option>
          <option value="3">Walt Disney World, Florida</option>
        </select>
      </div>
  </div>

这就是我已经在程序中已经完成的工作。这是我为迪士尼提供的代码，其后是我在其他地方找到的坐标：

<!DOCTYPE html>
<html>
<head>
  <script
     src="http://maps.googleapis.com/maps/api/js">
  </script>

  <script>
  function initialize() {
      var mapProp = {
center:new google.maps.LatLng(28.3341439,-81.5871676),
zoom:14,
mapTypeId:google.maps.MapTypeId.ROADMAP
    };
    var map=new google.maps.Map(document.getElementById("googleMap"), mapProp);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>

法国巴黎是48.8589507,2.2775174

夏威夷檀香山是21.3282956，-157.9390673

非常感谢任何帮助。

Answer 1

我能够编写一个完全符合我要求的工作程序。这是代码：

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

<!-- 
  geoLocMap.html by Bill Weinman 
  <http://bw.org/contact/>
  created 2011-07-07
  updated 2011-07-20

  Copyright (c) 2011 The BearHeart Group, LLC
  This file may be used for personal educational purposes as needed. 
  Use for other purposes is granted provided that this notice is
  retained and any changes made are clearly indicated as such. 
-->

<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<style type="text/css">
    html { height: 90% }
    body { height: 100%; margin: 0px; padding: 0px }
    #map_canvas { height: 90%; width: 90% }
</style>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>
<script type="text/javascript">
    var watchID;
    var geo;    // for the geolocation object
    var map;    // for the google map object
    var mapMarker;  // the google map marker object

    // position options
    var MAXIMUM_AGE = 200; // miliseconds
    var TIMEOUT = 300000;
    var HIGHACCURACY = true;

    function getGeoLocation() {
        try {
            if( !! navigator.geolocation ) return navigator.geolocation;
            else return undefined;
        } catch(e) {
            return undefined;
        }
    }

    function show_map(position) {
        var lat = position.coords.latitude;
        var lon = position.coords.longitude;
        var latlng = new google.maps.LatLng(lat, lon);

        if(map) {
            map.panTo(latlng);
            mapMarker.setPosition(latlng);
        } else {
            var myOptions = {
                zoom: 18,
                center: latlng,

                // mapTypeID --
                // ROADMAP displays the default road map view
                // SATELLITE displays Google Earth satellite images
                // HYBRID displays a mixture of normal and satellite views
                // TERRAIN displays a physical map based on terrain information.
                mapTypeId: google.maps.MapTypeId.ROADMAP
            };
            map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
            map.setTilt(0); // turns off the annoying default 45-deg view

            mapMarker = new google.maps.Marker({
                position: latlng,
                title:"You are here."
            });
            mapMarker.setMap(map);
        }
    }

    function geo_error(error) {
        stopWatching();
        switch(error.code) {
            case error.TIMEOUT:
                alert('Geolocation Timeout');
                break;
            case error.POSITION_UNAVAILABLE:
                alert('Geolocation Position unavailable');
                break;
            case error.PERMISSION_DENIED:
                alert('Geolocation Permission denied');
                break;
            default:
                alert('Geolocation returned an unknown error code: ' + error.code);
        }
    }

    function stopWatching() {
        if(watchID) geo.clearWatch(watchID);
        watchID = null;
    }

    function startWatching() {
        watchID = geo.watchPosition(show_map, geo_error, {
            enableHighAccuracy: HIGHACCURACY,
            maximumAge: MAXIMUM_AGE,
            timeout: TIMEOUT
        });
    }

    window.onload = function() {
        if((geo = getGeoLocation())) {
            startWatching();
        } else {
            alert('Geolocation not supported.')
        }
    }
</script>
<!--Changes added by Eric Wood  -->
<script>
    function tripChange() {
        var s = document.getElementById("tripSelection");
        var tripSelection = s.options[s.selectedIndex].value;

        if (tripSelection == 1) {
            value1();
        }else if(tripSelection == 2){
            value2();
        }else if(tripSelection == 3){
            value3();
        }
    }
            function value1() {
                var mapProp = {
                    center:new google.maps.LatLng(48.8589507,2.2775174),
                    zoom:14,
                    mapTypeId:google.maps.MapTypeId.ROADMAP
                };
                var Map=new google.maps.Map(document.getElementById("map_canvas"), mapProp);
            }

            function value2() {
                var mapProp = {
                    center:new google.maps.LatLng(21.3282956,-157.9390673),
                    zoom:14,
                    mapTypeId:google.maps.MapTypeId.ROADMAP
                };
                var Map=new google.maps.Map(document.getElementById("map_canvas"), mapProp);
            }

            function value3() {
                var mapProp = {
                    center:new google.maps.LatLng(28.3341439,-81.5871676),
                    zoom:14,
                    mapTypeId:google.maps.MapTypeId.ROADMAP
                };
                var Map=new google.maps.Map(document.getElementById("map_canvas"), mapProp);
            }
</script>
</head>
<body>
      <div id="map_canvas"></div>
    <section>
    <div id="vacationLocations" >
        <h2>Vacation Locations</h2>
    <form name="tripSelection" method="post" method="get" >
        <div class="formRow">
            <label for="serviceSelection">
             Trip Selection</label>
            <select name="tripSelection" id="tripSelection" class="validated" onchange="tripChange()" required>
                <option value="">-Select One-</option>
                <option value="1">Paris, France</option>
                <option value="2">Honolulu, Hawaii</option>
                <option value="3">Walt Disney World, Florida</option>
            </select>
        </div>
</div>
</body>
</html>

使用从下拉框中选择的内容更改HTML5中的地理位置地图

1 个答案: