是否可以从 OpenLayers 编写和保存 KML?有人知道导出一个的例子吗?
最佳答案
您只能将矢量要素导出到 KML。
function GetKMLFromFeatures(features) {
var format = new OpenLayers.Format.KML({
'maxDepth':10,
'extractStyles':true,
'internalProjection': map.baseLayer.projection,
'externalProjection': new OpenLayers.Projection("EPSG:4326")
});
return format.write(features);
}
更新
为了强制浏览器将 KML 字符串下载为 KML 文件,您需要将该字符串发送回服务器端,以便它可以作为文件返回到浏览器以供下载。
您还没有指定您在服务器端使用的语言/平台/等但这是我在 C# 中所做的。
我创建了一个处理程序,它接收来自查询字符串的文件名和来自文本区域表单的 KML。
KMLDownload.ashx:
<%@ WebHandler Language="C#" Class="KMLDownload" %>
using System;
using System.Web;
public class KMLDownload : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
HttpResponse response = context.Response;
string kml = context.Request["kml"];
string filename = context.Request.QueryString["filename"];
if (String.IsNullOrEmpty(kml))
{
context.Response.ContentType = "text/plain";
context.Response.Write("{\"error\":\"No files recevied\"}");
}
else
{
if (String.IsNullOrEmpty(filename)){
filename = "Features_KML.kml";
}
// force a download of the kml file.
response.Clear();
response.ContentType = "application/kml";
response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
response.AddHeader("content-legth", kml.Length.ToString());
response.Write(kml.ToString());
response.End();
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
然后从我的 javascript 端我简单地调用它来启动下载:
var filename = "NameofKMLfileI_WANT.kml";
var url = "secure/KMLDownload.ashx";
if (filename) {
url += "?filename=" + filename;
}
var input = '<TEXTAREA name="kml">' + kml + '</TEXTAREA>';
//send request
jQuery('<form action="' + url + '" method="post">' + input + '</form>').appendTo('body').submit().remove();
关于javascript - Openlayers 根据您的 map 编写并保存 KML,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9364090/