动态标记 - Google Maps API - 标记在i循环中不会递增 [英] Dynamic Markers - Google Maps API - Markers not incrementing with i value in loop

问题描述

我已经在下面创建了map api，并且有一个来自数据库的地址数组。
地图加载正确，但是我有以下问题。

I have created the maps api below and have an array of addresses that come from a database. The map loads correctly, however I have the following issue.

1. 动态标记不会以i的值递增，所以地图显示所有标记为1而不是1,2,3,4,5

1. The dynamic Markers are not incrementing with the value of "i".. so the map displays all markers with "1" and not "1,2,3,4,5"

// Define Vars
var pinColor = "FE7569";
var marker, i;

// Set default map center location
var latlng = new google.maps.LatLng(-27.79014,153.18049);

// Create pinShadow for each marker 
var pinShadow = new google.maps.MarkerImage("http://chart.apis.google.com        /chart?chst=d_map_pin_shadow",
    new google.maps.Size(40, 37),
    new google.maps.Point(0, 0),
    new google.maps.Point(12, 35));

// Function to create the dynamic marker
function pinImage(i){
    return image = new google.maps.MarkerImage("http://www.googlemapsmarkers.com/v1/"+i+"/"+pinColor+"/", new google.maps.Size(21, 34), new google.maps.Point(0,0), new google.maps.Point(10, 34));
}

// Function to run once page has loaded
    function initialize(){      
// Set Default settigns for google map
var settings = {
    zoom: 10,
    center: latlng,
    mapTypeControl: true,
    mapTypeControlOptions: {style: google.maps.MapTypeControlStyle.DROPDOWN_MENU},
    navigationControl: true,
    navigationControlOptions: {style: google.maps.NavigationControlStyle.SMALL},
    mapTypeId: google.maps.MapTypeId.ROADMAP};

// Start Google Maps and assign it to div on site
var map = new google.maps.Map(document.getElementById("map_canvas"), settings);     

// loop though total numner of address in array
for (i = 1; i < total; i++) {  
    // Use geocoder to grab latlong for user inputed address
    geocoder.geocode( { 'address': address[i]}, function(results, status) {
        if (status == google.maps.GeocoderStatus.OK) {
            // Redefine map center location
            if (i = 1){ map.setCenter(results[0].geometry.location); }

            // Create dynamic markers on map as per the address array
            var marker = new google.maps.Marker({
                map: map, 
                position: results[0].geometry.location,
                title:address[i],
                zIndex: i,
                // PROBLEM CODE --- Using the function below it creates all Markers with a "1" instead of the "i" value..??  
                icon: pinImage(i),
                shadow: pinShadow
            });         
        }
    });
    }
}

推荐答案

旧的函数范围包装技巧（function（i）{...}）（i）在这里工作。没有它，执行取i的最终值。另外，如果（i = 1）应该是 if（i == 1）

The old "function scope wrapper" trick (function(i) {...})(i) works here. Without it, the execution takes the final value of i. Also, if(i = 1) should be if(i == 1)

要玩耍： http://jsfiddle.net/BK8vv/

To play around: http://jsfiddle.net/BK8vv/

for (var i = 1; i < total; i++) {  
   (function(i) {

    // Use geocoder to grab latlong for user inputed address
    geocoder.geocode( { 'address': address[i]}, function(results, status) {
        if (status == google.maps.GeocoderStatus.OK) {
            // Redefine map center location
            if (i == 1){ map.setCenter(results[0].geometry.location); }

            // Create dynamic markers on map as per the address array
                    alert(i);
            var marker = new google.maps.Marker({
                map: map, 
                position: results[0].geometry.location,
                title:address[i],
                zIndex: i,
                // PROBLEM CODE --- Using the function below it creates all Markers with a "1" instead of the "i" value..??  
                icon: pinImage(i),
                shadow: pinShadow
            });         
        }
       });
     })(i);
    }
}

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