怎么实现google地图拖拽的时候旁边的文本框中的经纬值也跟着变化
日期：2014-05-16 浏览次数：20496 次
如何实现google地图拖拽的时候旁边的文本框中的经纬值也跟着变化
如题，先粘上代码吧、
如题，先粘上代码吧、
- C# code
<html>
<head>
<title></title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<script src="http://maps.google.com/maps?file=api&v=2&sensor=false&key=ABQIAAAAn8dF06B-QpniAeXC-bdCVBSCooeQ7x8_7WnK9Fc_vSUhGs5F4BSMl23EayM7v4EESxLBoX22Z0GQ3Q" type="text/javascript"></script>
<script type="text/javascript">
// 矩形是在地图上勾勒经纬边界的简单叠加层，其边界已指定
// 粗细和颜色，并（可选）可以使用半透明背景颜色.
function Rectangle(bounds, opt_weight, opt_color) {
this.bounds_ = bounds;
this.weight_ = opt_weight || 2;
this.color_ = opt_color || "#FF0000";
}
Rectangle.prototype = new GOverlay();
// 创建表示此矩形的 DIV.
Rectangle.prototype.initialize = function (map) {
// 创建表示我们的矩形的 DIV
var div = document.createElement("div");
div.style.border = this.weight_ + "px solid " + this.color_;
div.style.position = "absolute";
// 我们的矩形相对于地图是平面，所以将其添加到MAP_PANE 面板，
// 与地图本身的绘制顺序相同（即在标记阴影下方）
map.getPane(G_MAP_MAP_PANE).appendChild(div);
this.map_ = map;
this.div_ = div;
}
// 从地图面板删除 DIV
Rectangle.prototype.remove = function () {
this.div_.parentNode.removeChild(this.div_);
}
// 将我们的数据复制到新的矩形
Rectangle.prototype.copy = function () {
return new Rectangle(this.bounds_, this.weight_, this.color_,
this.backgroundColor_, this.opacity_);
}
// 基于当前投影和缩放级别重新绘制矩形
Rectangle.prototype.redraw = function (force) {
// We only need to redraw if the coordinate system has changed
if (!force) return;
// 计算边界两个对角的 DIV 坐标，获取矩形的尺寸和位置
var c1 = this.map_.fromLatLngToDivPixel(this.bounds_.getSouthWest());
var c2 = this.map_.fromLatLngToDivPixel(this.bounds_.getNorthEast());
// 现在基于边界的 DIV 坐标放置 DIV
this.div_.style.width = Math.abs(c2.x - c1.x) + "px";
this.div_.style.height = Math.abs(c2.y - c1.y) + "px";
this.div_.style.left = (Math.min(c2.x, c1.x) - this.weight_) + "px";
this.div_.style.top = (Math.min(c2.y, c1.y) - this.weight_) + "px";
}
function initialize() {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map_canvas"));
map.setCenter(new GLatLng(39.917, 116.397), 14);
map.addControl(new GSmallMapControl());
map.addControl(new GMapTypeControl());
// 在地图中心显示矩形，大小约为主地图的四分之一
var result = document.getElementById("bound");
var bounds = map.getBounds();
result.value = bounds;
var southWest = bounds.getSouthWest();
var northEast = bounds.getNorthEast();
var lngDelta = northEast.lng() - southWest.lng();
var latDelta = northEast.lat() - southWest.lat();
var rectBounds = new GLatLngBounds(
new GLatLng(southWest.lat() + latDelta,
southWest.lng() + lngDelta),
new GLatLng(northEast.lat() - latDelta,
northEast.lng() - lngDelta));
map.addOverlay(new Rectangle(rectBounds));
}
}
</script>
</head>
<body onload="initialize()" onunload="GUnload()">
<div id="map_canvas" style="width:50%; height:500px;float:left;"></div><br />
<input type="text" id="bound" name="bound" value="" />
</body>
</html>
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