我目前正在开发一个 bing map 应用程序,当用户单击图钉时,我似乎无法显示信息框。我一直在关注 SDK,它应该几乎完全相同。这是我所拥有的:
// ***********************************
// Function creates a single pin
// and returns a reference to the pin
function createMapPin(latLong, sName) {
var pinImg = "imagespins/Good.png";
var pin = new Microsoft.Maps.Pushpin(latLong, {
icon: pinImg,
anchor: new Microsoft.Maps.Point(8, 8),
draggable: true,
width: 48,
height: 48
});
pin.title = sName;
pinInfobox = new Microsoft.Maps.Infobox(pin.getLocation(),
{ title: 'My Pushpin',
description: 'This pushpin is located at (0,0).',
visible: false,
offset: new Microsoft.Maps.Point(0, 15)
});
// Add handlers for the pushpin events
Microsoft.Maps.Events.addHandler(pin, 'click', displayInfobox);
// Hide the infobox when the map is moved.
Microsoft.Maps.Events.addHandler(map, 'viewchange', hideInfobox);
map.entities.push(pin);
map.entities.push(pinInfobox);
return pin;
}
function displayInfobox(e) {
pinInfobox.setOptions({ visible: true });
}
function hideInfobox(e) {
pinInfobox.setOptions({ visible: false });
}
引脚被成功创建并添加到 map 中,当用户单击引脚时,它确实进入了 dispayInfoBox 方法,但消息框似乎没有出现。
任何建议都非常感谢。谢谢!
最佳答案
你的代码有效,我试过了,只要你只调用 createMapPin()
一次。但是根据您的代码判断,您的意图是多次调用 createMapPin()
,这将导致 infobox
停止像您认为的那样运行。原因是这一行:
pinInfobox = new Microsoft.Maps.Infobox(pin.getLocation(),
{ title: 'My Pushpin',
description: 'This pushpin is located at (0,0).',
visible: false,
offset: new Microsoft.Maps.Point(0, 15)
});
由于您没有通过
pinInfobox
关键字将 var
声明为局部变量,因此它隐式地被声明为全局变量。我不认为这是您的意图,因为一旦您再次调用 createMapPin()
, pinInfobox
就会被覆盖,因为它是一个全局变量。因此,实际上,即使您不断创建新的信息框,它也只有一个实例,并且它只是不断地获得分配的新值。因此,如果您单击图钉,一个信息框可能会在屏幕外某处弹出而您看不到它。我相信您的意图是让每个图钉关联一个信息框?为此,您需要将信息框声明为局部变量,如下所示:var pinInfobox = new Microsoft.Maps.Infobox(pin.getLocation(),
{ title: 'My Pushpin',
description: 'This pushpin is located at (0,0).',
visible: false,
offset: new Microsoft.Maps.Point(0, 15)
});
您还需要修改事件处理程序以与信息框对象的本地版本交互,而不仅仅是单个全局变量。最简单的方法是将事件处理程序声明为
createMapPin()
函数范围内的匿名函数,并使用函数绑定(bind)覆盖 this 关键字的含义:Microsoft.Maps.Events.addHandler(pin, 'click', function (e) {
this.setOptions({ visible: true });
} .bind(pinInfobox));
Microsoft.Maps.Events.addHandler(map, 'viewchange', function(e) {
this.setOptions({ visible: false });
}.bind(pinInfobox));
所以这是你更新的代码:
function createMapPin(latLong, sName) {
var pinImg = "imagespins/Good.png";
var pin = new Microsoft.Maps.Pushpin(latLong, {
icon: pinImg,
anchor: new Microsoft.Maps.Point(8, 8),
draggable: true,
width: 48,
height: 48
});
pin.title = sName;
var pinInfobox = new Microsoft.Maps.Infobox(pin.getLocation(),
{
title: 'My Pushpin',
description: 'This pushpin is located at (0,0).',
visible: false,
offset: new Microsoft.Maps.Point(0, 15)
});
// Add handlers for the pushpin events
Microsoft.Maps.Events.addHandler(pin, 'click', function(e) {
this.setOptions({ visible: true });
}.bind(pinInfobox));
// Hide the infobox when the map is moved.
Microsoft.Maps.Events.addHandler(map, 'viewchange', function(e) {
this.setOptions({ visible: false });
}.bind(pinInfobox));
map.entities.push(pin);
map.entities.push(pinInfobox);
return pin;
}