javascript - Google Maps API——点击时每个标记的唯一活动图标

Question

我使用 Google Maps API 有以下 JS：

// initialize variables
var infowindow = null;
var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var gmarkers = [];

$(document).ready(function () { initialize(); });

function initialize() {

    // directions
    directionsDisplay = new google.maps.DirectionsRenderer();

    var centerMap = new google.maps.LatLng(busipress_map_vars.center_lat , busipress_map_vars.center_long);

    var myOptions = {
        zoom: 4,
        center: centerMap,
        mapTypeId: google.maps.MapTypeId.TERRAIN
    }

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

    setMarkers(map, sites);
    infowindow = new google.maps.InfoWindow({
            content: "loading..."
        });

    var start = busipress_map_vars.path_start;
    var end = busipress_map_vars.path_end;
    var request = {
        origin:start,
        destination:end,
        travelMode: google.maps.DirectionsTravelMode.DRIVING
    };
    directionsService.route(request, function(response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
        }
    });

    directionsDisplay.setMap(map);
}

/**
 * show locations
 */
var sites = busipress_map_vars.locations;

/**
 * set markers on map
 */
function setMarkers(map, markers) {

    // default icon
    var defaultIcon = new google.maps.MarkerImage(busipress_map_vars.default_map_icon,
        // This marker is 32 pixels wide by 32 pixels tall.
        new google.maps.Size(busipress_map_vars.default_map_icon_width, busipress_map_vars.default_map_icon_height),
        // The origin for this image is 0,0.
        new google.maps.Point(0,0),
        // The anchor for this image is the base of the flagpole at 0,32.
        new google.maps.Point((busipress_map_vars.default_map_icon_width / 2), busipress_map_vars.default_map_icon_height));

    // default shadow
    var shadow = new google.maps.MarkerImage(busipress_map_vars.map_icon_shadow,
        // The shadow image is larger in the horizontal dimension
        // while the position and offset are the same as for the main image.
        new google.maps.Size(busipress_map_vars.map_icon_shadow_width, busipress_map_vars.map_icon_shadow_height),
        new google.maps.Point(0,0),
        new google.maps.Point((busipress_map_vars.default_map_icon_width / 2), busipress_map_vars.map_icon_shadow_height));

    // active icion
    var activeIcon = new google.maps.MarkerImage(busipress_map_vars.active_map_icon,
        // This marker is 20 pixels wide by 32 pixels tall.
        new google.maps.Size(busipress_map_vars.active_map_icon_width, busipress_map_vars.active_map_icon_height),
        // The origin for this image is 0,0.
        new google.maps.Point(0,0),
        // The anchor for this image is the base of the flagpole at 0,32.
        new google.maps.Point((busipress_map_vars.active_map_icon_width / 2), busipress_map_vars.active_map_icon_height));
    var shape = {
        coord: [9,0,6,1,4,2,2,4,0,8,0,12,1,14,2,16,5,19,7,23,8,26,9,30,9,34,11,34,11,30,12,26,13,24,14,21,16,18,18,16,20,12,20,8,18,4,16,2,15,1,13,0],
        type: 'poly'
    };

    for (var i = 0; i < markers.length; i++) {
        var sites = markers[i];
        var siteLatLng = new google.maps.LatLng(sites[1], sites[2]);
        var marker = new google.maps.Marker({
            position: siteLatLng,
            map: map,
            title: sites[0],
            icon: sites[4][0],
            shadow: sites[6][0],
            zIndex: 1,
            html: sites[3]
        });

        google.maps.event.addListener(marker, "click", function () {
            for (var i = 0; i < gmarkers.length; i++) {
               //gmarkers[i].setIcon(defaultIcon);
               gmarkers[i].setIcon(sites[4][0]);
            }
            //this.setIcon(activeIcon);
            this.setIcon(sites[5][0]);

            infowindow.setContent(this.html);
            infowindow.open(map, this);
        });
        gmarkers.push(marker);
    }
}

我试图做的是site为每个标记映射一个图标（因为它是唯一的），然后单击，将其更改为该站点的活动状态。因此，将其更改为活动图标似乎可行，但使用该重置功能（将所有其他图标更改回默认图标）会将其转换回站点的图标之一，而不是每个单独的图标。有人对为什么会发生这种情况有任何想法吗？

另外，当我第一次研究这个时，我正在使用defaultIcon例如（你可以看到它在点击动作中被注释掉了。因为我现在通过本地化 Javascript 来传递图标的 URL，有什么我可以传递的吗？到new google.maps.Marker原始声明中所做的大小、原点和点var defaultIcon。例如，sites[4][0]将有一个图像 URL，但sites[4][1]将有宽度和sites[4][2]高度。我实际上不确定它是什么如果我没有任何东西，我就会离开，所以这里有点困惑。谢谢！

更新

我在想问题可能出在我声明变量的地方，所以我将它们添加到for loop并调整了地图标记以使用这些：

// initialize variables
var infowindow = null;
var directionDisplay;
var directionsService = new google.maps.DirectionsService();
var gmarkers = [];

$(document).ready(function () { initialize(); });

function initialize() {

    // directions
    directionsDisplay = new google.maps.DirectionsRenderer();

    var centerMap = new google.maps.LatLng(busipress_map_vars.center_lat , busipress_map_vars.center_long);

    var myOptions = {
        zoom: 4,
        center: centerMap,
        mapTypeId: google.maps.MapTypeId.TERRAIN
    }

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

    setMarkers(map, sites);
    infowindow = new google.maps.InfoWindow({
            content: "loading..."
        });

    var start = busipress_map_vars.path_start;
    var end = busipress_map_vars.path_end;
    var request = {
        origin:start,
        destination:end,
        travelMode: google.maps.DirectionsTravelMode.DRIVING
    };
    directionsService.route(request, function(response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
        }
    });

    directionsDisplay.setMap(map);
}

/**
 * show locations
 */
var sites = busipress_map_vars.locations;

/**
 * set markers on map
 */
function setMarkers(map, markers) {

    for (var i = 0; i < markers.length; i++) {
        var sites = markers[i];

        // default icon
        var defaultIcon = new google.maps.MarkerImage(sites[4][0],
            // This marker is 32 pixels wide by 32 pixels tall.
            new google.maps.Size(sites[4][1], sites[4][2]),
            // The origin for this image is 0,0.
            new google.maps.Point(0,0),
            // The anchor for this image is the base of the flagpole at 0,32.
            new google.maps.Point((sites[4][1] / 2), sites[4][2]));

        // default shadow
        var shadow = new google.maps.MarkerImage(sites[6][0],
            // The shadow image is larger in the horizontal dimension
            // while the position and offset are the same as for the main image.
            new google.maps.Size(sites[6][1], sites[6][2]),
            new google.maps.Point(0,0),
            new google.maps.Point((sites[6][1] / 2), sites[6][2]));

        // active icion
        var activeIcon = new google.maps.MarkerImage(sites[5][0],
            // This marker is 20 pixels wide by 32 pixels tall.
            new google.maps.Size(sites[5][1], sites[5][2]),
            // The origin for this image is 0,0.
            new google.maps.Point(0,0),
            // The anchor for this image is the base of the flagpole at 0,32.
            new google.maps.Point((sites[5][1] / 2), sites[5][2]));
        var shape = {
            coord: [9,0,6,1,4,2,2,4,0,8,0,12,1,14,2,16,5,19,7,23,8,26,9,30,9,34,11,34,11,30,12,26,13,24,14,21,16,18,18,16,20,12,20,8,18,4,16,2,15,1,13,0],
            type: 'poly'
        };

        var siteLatLng = new google.maps.LatLng(sites[1], sites[2]);
        var marker = new google.maps.Marker({
            position: siteLatLng,
            map: map,
            title: sites[0],
            icon: defaultIcon,
            shadow: shadow,
            zIndex: 1,
            html: sites[3]
        });

        google.maps.event.addListener(marker, "click", function () {
            for (var i = 0; i < gmarkers.length; i++) {
               gmarkers[i].setIcon(defaultIcon);
            }
            this.setIcon(activeIcon);

            infowindow.setContent(this.html);
            infowindow.open(map, this);
        });
        gmarkers.push(marker);
    }
}

但它仍然将defaultIcon所有更改为一个，而不是单个 defaultIcon 图像。这可能与另一个 for 循环中的 for 循环有关，但我不太确定。

score 4 · Accepted Answer

您需要更改点击侦听器功能：

    google.maps.event.addListener(marker, "click", function () {
        for (var i = 0; i < gmarkers.length; i++) {
           gmarkers[i].setIcon(defaultIcon);
        }
        this.setIcon(activeIcon);

        infowindow.setContent(this.html);
        infowindow.open(map, this);
    });

您需要为每个标记保存“唯一”图标并将其更改回那个，而不是 defaultIcon。最简单的可能是将其保存为标记的属性（即 marker.myDefaultIcon），然后您可以执行以下操作：

gmarkers[i].setIcon(gmarkers[i].myDefaultIcon);

jsfiddle（再次从您之前的问题修改）

更新：我在您提供的链接上收到一个 javascript 错误：

Error: marker[i] is undefined
Source File: http://zslabs.com/jhtwp/wp-content/plugins/busipress/js/map.1349993292.js
Line: 105

105 是这一行：this.setIcon(marker[i].myActiveIcon);

这里：

    google.maps.event.addListener(marker, "click", function () {
        for (var i = 0; i < gmarkers.length; i++) {
           gmarkers[i].setIcon(gmarkers[i].myDefaultIcon);
        }
        this.setIcon(marker[i].myActiveIcon);

        infowindow.setContent(this.html);
        infowindow.open(map, this);
    });

我想你想要 this.myActiveIcon。

jsfiddle 说明了这个概念（“点”是活动的，没有点是默认的）

javascript - Google Maps API——点击时每个标记的唯一活动图标

更新

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