Question

我正在尝试使用mySQL数据库中的城市制作一系列纬度和经度。这就是我到目前为止所拥有的。我试图在javascript中设置数组变量，并回显里面的字段。读取“标记”数组以使标记显示在所需位置的谷歌地图上：

编辑：这是整个脚本

<script type="text/javascript">

var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var map;

function initialize() {
    directionsDisplay = new google.maps.DirectionsRenderer();

    var mapOptions = {
    zoom: 5,
    mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    map = new google.maps.Map(document.getElementById('map_canvas'),
                              mapOptions);
    directionsDisplay.setMap(map);

    var markers = [

    <?php

    //orgnize fans by city
    $query = "SELECT city, state, COUNT(*) fans FROM users GROUP BY city ORDER BY fans DESC";
    $result = mysql_query($query) or die(mysql_error());
    while($row = mysql_fetch_array($result)){

    //pulls the city, state code from the database and stores it as a string in $address
    $address = urlencode('"' . $row['city'] . ", " . $row['state'] . '"');
    $googleApi = 'http://maps.googleapis.com/maps/api/geocode/json?address=%s&sensor=false';     

    $json = file_get_contents(sprintf($googleApi, $address));   
    $resultObject = json_decode($json);

    $location = $resultObject->results[0]->geometry->location;

    $lat = $location->lat;
    $lng = $location->lng;

        echo "{ lat: ".$lat.", lng: ".$lng.", name: ".'"'.$row['city'].", ".$row['state'].'"'."},";
    }

    ?>

    ];

    // Create the markers ad infowindows.
    for (index in markers) addMarker(markers[index]);
    function addMarker(data) {
        // Create the marker
        var marker = new google.maps.Marker({
            position: new google.maps.LatLng(data.lat, data.lng),
            map: map,
            title: data.name
        });

        // Create the infowindow with two DIV placeholders
        // One for a text string, the other for the StreetView panorama.
        var content = document.createElement("DIV");
        var title = document.createElement("DIV");
        title.innerHTML = data.name;
        content.appendChild(title);
        var streetview = document.createElement("DIV");
        streetview.style.width = "200px";
        streetview.style.height = "200px";
        content.appendChild(streetview);
        var infowindow = new google.maps.InfoWindow({
            content: content
        });

        // Open the infowindow on marker click
        google.maps.event.addListener(marker, "click", function() {
            infowindow.open(map, marker);
        });

        // Handle the DOM ready event to create the StreetView panorama
        // as it can only be created once the DIV inside the infowindow is loaded in the DOM.
        google.maps.event.addListenerOnce(infowindow, "domready", function() {
            var panorama = new google.maps.StreetViewPanorama(streetview, {
            navigationControl: false,
            enableCloseButton: false,
            addressControl: false,
            linksControl: false,
            visible: true,
            position: marker.getPosition()
            });
       });

    }

    // Try HTML5 geolocation
    if(navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(function(position) {
            var pos = new google.maps.LatLng(position.coords.latitude,
            position.coords.longitude);

            var infowindow = new google.maps.InfoWindow({
            map: map,
            position: pos,
            content: 'Your Current City'
        });

            map.setCenter(pos);
        }, function() {
        handleNoGeolocation(true);
        });

    } else {
        // Browser doesn't support Geolocation
        handleNoGeolocation(false);
    }

}

function handleNoGeolocation(errorFlag) {
    if (errorFlag) {
        var content = 'Error: The Geolocation service failed.';
    } else {
        var content = 'Error: Your browser doesn\'t support geolocation.';
    }

    var options = {
    map: map,
    position: new google.maps.LatLng(60, 105),
    content: content
    };

    var infowindow = new google.maps.InfoWindow(options);
    map.setCenter(options.position);
}


function calcRoute() {
    var start = document.getElementById('start').value;
    var end = document.getElementById('end').value;
    var waypts = [];
    var checkboxArray = document.getElementById('waypoints');
    for (var i = 0; i < checkboxArray.length; i++) {
        if (checkboxArray.options[i].selected == true) {
            waypts.push({
                        location:checkboxArray[i].value,
                        stopover:true});
        }
    }

    var request = {
    origin: start,
    destination: end,
    waypoints: waypts,
    optimizeWaypoints: true,
    travelMode: google.maps.DirectionsTravelMode.DRIVING
    };
    directionsService.route(request, function(response, status) {
                            if (status == google.maps.DirectionsStatus.OK) {
                            directionsDisplay.setDirections(response);
                            var route = response.routes[0];
                            var summaryPanel = document.getElementById('directions_panel');
                            summaryPanel.innerHTML = '';
                            // For each route, display summary information.
                            for (var i = 0; i < route.legs.length; i++) {
                            var routeSegment = i + 1;
                            summaryPanel.innerHTML += '<b>Route Segment: ' + routeSegment + '</b><br>';
                            summaryPanel.innerHTML += route.legs[i].start_address + ' to ';
                            summaryPanel.innerHTML += route.legs[i].end_address + '<br>';
                            summaryPanel.innerHTML += route.legs[i].distance.text + '<br><br>';
                            }
                            }
                            });
}

google.maps.event.addDomListener(window, 'load', initialize);


</script>

当我打开html时，我调用initialize并制作画布：

<body onload="initialize()">

<div id="map_canvas" style="width: 1100px; height: 450px;">map div</div>

Answer 1

您有拼写错误：有时您使用long，有时则lng。

代码段中的

：

var marker = new google.maps.Marker({
        position: new google.maps.LatLng(data.lat, data.lng),
        map: map,
        title: data.name
    });}

虽然早些时候使用

$lng = $location->lng;
echo "{ lat: ".$lat.", lng: ".$long.", name: ".'"'.$row['city'].", ".$row['state'].'"'."},";

实际上，您的echo语句应该在数组中产生经度，它引用了一个非初始化变量$long。解决这个问题，你应该好好去。换句话说，改变

$lng = $location->lng;

到

$long = $location->lng;

（或更改你的echo语句......）

Answer 2

我之前的回答是关于错字的。我认为“如何使用谷歌API绘制地图”存在一个基本问题。以下代码段（来自google JavaScript API显示了使用叠加层的示例（标记是什么）：

var myLatlng = new google.maps.LatLng(-25.363882,131.044922); 
var mapOptions = {   
    zoom: 4,   
    center: myLatlng,   
mapTypeId: google.maps.MapTypeId.ROADMAP, }

var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
var marker = new google.maps.Marker({
     position: myLatlng,
     title:"Hello World!" });  
// To add the marker to the map, call setMap();
marker.setMap(map);

您的代码中似乎缺少其中一些步骤 - 也许您没有显示它们，或者您可能没有意识到您需要它们？

编辑：即使您发布了完整的代码，我仍然没有看到我期望的某些事情。

以下是您可以尝试的一件事：在引用谷歌API之前调用它：添加此行

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false"> </script>

在<head>

之前的<script>正下方

解决这个问题，然后拿出一堆“多余的”（为了“用一个图钉来获取地图”），允许我创建一个可以渲染纽约地图的simple file ，NY，上面有一个标记。源代码可以在http://www.floris.us/SO/maptest.php.txt找到。从那里，您可以添加更多东西......

进一步编辑：通过吸取的经验教训，我制作了http://www.floris.us/SO/maptestFull.php，其中包含您正在寻找的大多数功能（而不是数据库查找，显然我没有这样做）。再一次，源代码被复制到.php.txt文件中，以便您可以查看它。稍微凌乱（试图打开/关闭） - 你必须仔细观察我所做的所有改变。

试图在php中动态制作纬度和经度数组

2 个答案: