具有外部样式的 openlayers kml
我正在尝试将我的 kml 样式移动到外部文档以与 OpenLayers 一起使用。当样式直接包含在 kml 文件中时，它们才有效。
起初我以为我可以使用带有 styleUrl 标签的直接 kml 来实现此目的：
<styleUrl>http://localhost/map.kml#myIcon</styleUrl>
但是，当我尝试这样做时，map.kml 文件永远不会被请求，并且标记不会显示。我已经验证 styleUrl 网址有效。
我正在使用以下方式加载 KML：
new OpenLayers.Layer.GML('Name', 'kml_path', {
format: OpenLayers.Format.KML,
formatOptions: {
extractStyles: true,
extractAttributes: true
},
projection: map.displayProjection
});
OpenLayers.Format.KML API 中有一些名为“styles”和“styleBaseUrl”的诱人选项，但我找不到任何有关它们的用途或如何使用它们的文档。有人有这些方面的经验吗？
I'm trying to move my kml styles to an external document for use with OpenLayers. The styles work when they are included directly in the kml file.
At first I thought I could use straight kml for this with the styleUrl tag:
<styleUrl>http://localhost/map.kml#myIcon</styleUrl>
However, when I try to do that, the map.kml file never gets requested, and the markers don't show up. I've verified that the styleUrl url works.
I'm loading my kml using:
new OpenLayers.Layer.GML('Name', 'kml_path', {
format: OpenLayers.Format.KML,
formatOptions: {
extractStyles: true,
extractAttributes: true
},
projection: map.displayProjection
});
There are some tantalizing options called 'styles' and 'styleBaseUrl' in the OpenLayers.Format.KML API, but I cannot find any documentation about what they are for or how to use them. Does anyone have any experience with these?
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一种方法是，拥有一个带有样式的单独的 SLD 外部文件，并将其应用到您的 GML 图层。
查看 SLD OpenLayers 代码示例，网址为 http://openlayers.org/dev/examples/sld .html 并将示例图层替换为您的图层，并替换 sld-tasmania.xml 文件中的样式。这样，您就不需要 formatOptions 中的 extractStyles 选项。
One way could be, have a separate SLD external file with styles and apply it to your GML layer.
Take a look at the SLD OpenLayers code example at http://openlayers.org/dev/examples/sld.html and just replace the example layers with your layer and replace the styles in the sld-tasmania.xml file. This way, you would not need the option extractStyles in the formatOptions.
在 formatOptions 中，尝试添加 maxDepth:10 或某个此类整数。这是 api 定义。
maxDepth:{Integer} 递归加载外部 KML URL 的最大深度 默认为 0：不进行外部提取
如果默认为 0，我怀疑它会下载 0 个外部 kml 文件。
In formatOptions, try adding maxDepth:10 or some such integer. Here is the api definition.
maxDepth:{Integer} Maximum depth for recursive loading external KML URLs Defaults to 0: do no external fetching
With it defaulting to 0, I would suspect that it downloads 0 external kml files.
我真的没有任何关于 KML 的经验，所以如果这完全关闭，我很抱歉。我刚刚阅读了 KML 图层的代码，尤其是样式部分。从您的
styleUrl标记来看，基于 KML.js 中的代码，styleBaseUrl应该是http://localhost/map.kml:parseStyleMaps():
parseStyles():
styles参数似乎在每次代码读取数据时都会被初始化和重写，所以我认为这不会有任何好处。I really don't have any experience on KML, so I'm sorry if this is totally off. I just read the code for KML layers, especially the style portions. From your
styleUrltag it looks as thestyleBaseUrlshould behttp://localhost/map.kml, based on the code in KML.js:parseStyleMaps():
parseStyles():
The
stylesparameter seems to be initialized and rewritten each time the code reads the data, so that won't do any good I think.