我目前正在开发一个bing maps应用程序,当用户点击该引脚时,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。继承人我所拥有的:
// ***********************************
// 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 });
}
创建引脚并成功添加到地图中,当用户点击引脚时,它确实输入了dispayInfoBox方法,但消息框似乎没有出现。
任何建议都非常适合。谢谢!
答案 0 :(得分:3)
您的代码有效,我已尝试过,只要您只调用一次createMapPin()
即可。但是根据您的代码判断,您的意图是多次调用createMapPin()
,这会导致infobox
停止表现,就像您认为的那样。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)
});
由于您未通过pinInfobox
关键字将var
声明为局部变量,因此它会隐式声明为全局变量。我不认为这是你的意图,因为只要再次调用createMapPin()
pinInfobox
,因为它是一个全局变量,就会被覆盖。所以实际上,即使你继续创建新的信息框,它只有一个实例,它只是继续分配新的值。因此,如果你点击一个图钉,那么一个信息框可能会弹出屏幕外的某个地方而你却看不到它。我相信你的意图是每个图钉都有一个信息框?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,以便与信息框对象的本地版本进行交互,而不仅仅是单个全局变量。最简单的方法是在createMapPin()
函数的范围内将事件处理程序声明为匿名函数,并使用函数绑定覆盖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));
所以这是您更新的代码:
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;
}