javascript - 为什么鼠标悬停事件不为谷歌地图中的折线分派(dispatch)？

Question

我有一个复杂的流程，我必须为 map 上的每条折线附加鼠标悬停事件。附加事件的代码很简单:

google.maps.event.addListener(polyline, "mouseover", function() {
    console.log('event fired');

});

但是事件附加到少数多段线而不是其他多段线。可能是什么原因？

编辑

以下是在上述代码之前的更多代码，用于定义折线:

this.polyline = new google.maps.Polyline({
    path : [fromPosition, toPosition],
    strokeColor : '#CCCCCC',
    strokeOpacity : 1.0,
    strokeWeight : 2
});

var polyline = this.polyline;

编辑 2012 年 4 月 5 日

以下是产生问题的代码，请解释它发生的原因并推荐任何解决方案。谢谢

function Link(from, to) {
    this.from = from;
    this.to = to;
}   

Link.prototype.show = function() {
    this.line = new google.maps.Polyline({
        path : [this.from, this.to],
        strokeColor : "#0000FF",
        strokeOpacity : 0.5,
        strokeWeight : 6
    });

    this.line.setMap(map);    
    google.maps.event.addListener(this.line, 'mouseover', function() {
        this.line.setOptions({
            strokeOpacity : 1
        });
    });

    google.maps.event.addListener(this.line, 'mouseout', function() {
        this.line.setOptions({
            strokeOpacity : 0.5
        });
    });
}

var links = [];
var link2 = new Link(new google.maps.LatLng(-3.5999999999999996, 23.4), new google.maps.LatLng(-4.5, 23.4)), link1 = new Link(new google.maps.LatLng(-3.5999999999999996, 23.4), new google.maps.LatLng(-3.5999999999999996, 18));
links.push(link1);
links.push(link2);

// I've a long list of links, so I'll prefer a loop
for(var i = 0; i < links.length; i++) {
    links[i].show();
}

JSFiddle 演示:http://jsfiddle.net/wasimbhalli/9bg6x/

Answer 1

• demo: http://jsfiddle.net/kbngxku9/

 var map;

 function initialize() {

   var mapOptions = {
     center: new google.maps.LatLng(-3, 23),
     zoom: 5,
     mapTypeId: google.maps.MapTypeId.ROADMAP
   };

   map = new google.maps.Map(document.getElementById('mapcanvas'), mapOptions);

   var bounds = [];
   var bounds_group_1 = [new google.maps.LatLng(-3.5999999999999996, 23.4), new google.maps.LatLng(-4.5, 23.4)],
     bounds_group_2 = [new google.maps.LatLng(-3.5999999999999996, 23.4), new google.maps.LatLng(-3.5999999999999996, 18)];
   bounds.push(bounds_group_1);
   bounds.push(bounds_group_2);

   for (var i = 0; i < bounds.length; i++) {
     addPolylineSegment(bounds[i]);
   }
 }

 function addPolylineSegment(bounds) {

   // optionally you can put each polyline
   // segment into an array to later use...

   var polyline;

   polyline = new google.maps.Polyline({
     path: bounds,
     strokeColor: "#0000FF",
     strokeOpacity: 0.5,
     strokeWeight: 6
   });

   polyline.setMap(map);

   // attach event listener to each segment...
   google.maps.event.addListener(polyline, 'mouseover', function(event) {
     this.setOptions({
       strokeOpacity: 1
     });
   });

   google.maps.event.addListener(polyline, 'mouseout', function(event) {
     this.setOptions({
       strokeOpacity: 0.5
     });
   });
 }
 google.maps.event.addDomListener(window, 'load', initialize);