谷歌地图国家鼠标悬停并点击（FusionTables）

Question

此代码在国家/地区绘制多边形，当我的光标指向多边形的国家/地区颜色时，多边形的国家/地区颜色正在发生变化，但是当我单击一个国家/地区时，单击事件监听器时出现问题，总是提醒最后一个国家/地区名称，这是我的错误，寻求帮助.. .

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

<script type="text/javascript">
    var colors = ['#FF0000', '#00FF00', '#0000FF', '#FFFF00'];
    var map;

    function initialize() {
        var myOptions = {
            zoom: 2,
            center: new google.maps.LatLng(10, 0),
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };

        map = new google.maps.Map(document.getElementById('map-canvas'),
            myOptions);

        // Initialize JSONP request
        var script = document.createElement('script');
        var url = ['https://www.googleapis.com/fusiontables/v1/query?'];
        url.push('sql=');
        var query = 'SELECT name, kml_4326 FROM ' +
            '1foc3xO9DyfSIF6ofvN0kp2bxSfSeKog5FbdWdQ';
        var encodedQuery = encodeURIComponent(query);
        url.push(encodedQuery);
        url.push('&callback=drawMap');
        url.push('&key=AIzaSyAm9yWCV7JPCTHCJut8whOjARd7pwROFDQ');
        script.src = url.join('');
        var body = document.getElementsByTagName('body')[0];
        body.appendChild(script);
    }

    function drawMap(data) {
        var rows = data['rows'];
        var country= new Array();
        for (var i in rows) {
            if (rows[i][0] != 'Antarctica') {
                var newCoordinates = [];
                var geometries = rows[i][1]['geometries'];
                if (geometries) {
                    for (var j in geometries) {
                        newCoordinates.push(constructNewCoordinates(geometries[j]));
                    }
                } else {
                    newCoordinates = constructNewCoordinates(rows[i][1]['geometry']);
                }
                var randomnumber = Math.floor(Math.random() * 4);
                 country[i] = new google.maps.Polygon({
                    paths: newCoordinates,
                    strokeColor: colors[0],
                    strokeOpacity: 0,
                    strokeWeight: 1,
                    fillColor: colors[0],
                    fillOpacity: 0
                });
                google.maps.event.addListener(country[i], 'mouseover', function () {
                    this.setOptions({ fillOpacity: 0.2 });
                });
                google.maps.event.addListener(country[i], 'mouseout', function () {
                    this.setOptions({ fillOpacity: 0 });
                });
                google.maps.event.addListener(country[i], "click", function (event) {
                    alert(rows[i][0]);
                });
                country[i].setMap(map);
            }

        }
    }

    function constructNewCoordinates(polygon) {
        var newCoordinates = [];
        var coordinates = polygon['coordinates'][0];
        for (var i in coordinates) {
            newCoordinates.push(
                new google.maps.LatLng(coordinates[i][1], coordinates[i][0]));
        }
        return newCoordinates;
    }

    google.maps.event.addDomListener(window, 'load', initialize);
</script>

Answer 1

您的点击监听器总是提醒相同的数据：

            google.maps.event.addListener(country[i], "click", function (event) {
                alert(rows[i][0]);
            });

rows[i][0] 将始终是相同的值，因为当您循环退出时，i 将始终引用最后一个值。

修复它的一种方法是使用function closure，创建一个函数：

createPolygonClidkHandler(polygon, text) {
   google.maps.event.addListener(polygon, "click", function (event) {
     alert(text);
   });

然后使用它的功能来保持多边形及其相关文本上的“闭合”，如下所示：

function drawMap(data) {
    var rows = data['rows'];
    var country= new Array();
    for (var i in rows) {
        if (rows[i][0] != 'Antarctica') {
            var newCoordinates = [];
            var geometries = rows[i][1]['geometries'];
            if (geometries) {
                for (var j in geometries) {
                    newCoordinates.push(constructNewCoordinates(geometries[j]));
                }
            } else {
                newCoordinates = constructNewCoordinates(rows[i][1]['geometry']);
            }
            var randomnumber = Math.floor(Math.random() * 4);
             country[i] = new google.maps.Polygon({
                paths: newCoordinates,
                strokeColor: colors[0],
                strokeOpacity: 0,
                strokeWeight: 1,
                fillColor: colors[0],
                fillOpacity: 0
            });
            google.maps.event.addListener(country[i], 'mouseover', function () {
                this.setOptions({ fillOpacity: 0.2 });
            });
            google.maps.event.addListener(country[i], 'mouseout', function () {
                this.setOptions({ fillOpacity: 0 });
            });
            createPolygonClidkHandler(country[i], rows[i][0]);
            country[i].setMap(map);
        }

    }
}