如何访问 OpenLayers 中加载的 GML 文件的功能？
我似乎无法访问已加载的 GML 文件的功能。我将使用 OpenLayers 的基本示例来演示我想要做什么：
http://jsfiddle.net/AUbZn/ 14/
var map;
map = new OpenLayers.Map('map');
var wms = new OpenLayers.Layer.WMS("OpenLayers WMS", "http://vmap0.tiles.osgeo.org/wms/vmap0", {
layers: 'basic'
});
var layer = new OpenLayers.Layer.Vector("GML", {
strategies: [new OpenLayers.Strategy.Fixed()],
protocol: new OpenLayers.Protocol.HTTP({
url: "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20xml%20where%20url%3D'http%3A%2F%2Fopenlayers.org%2Fdev%2Fexamples%2Fgml%2Fpolygon.xml'",
format: new OpenLayers.Format.GML(),
}),
});
console.log("Layer features # = " + layer.features.length) //a
console.log("Layer features = " + layer.features) //b
map.addLayers([wms, layer]);
map.zoomToExtent(new OpenLayers.Bounds(-3.92, 44.34, 4.87, 49.55));
无论我做什么，我只得到 a = 0 和 b = "" ...我错了什么？
谢谢 ！
I seem not to be able to access features of a loaded GML file. I will use the basic example of OpenLayers to demonstrate what I want to do :
var map;
map = new OpenLayers.Map('map');
var wms = new OpenLayers.Layer.WMS("OpenLayers WMS", "http://vmap0.tiles.osgeo.org/wms/vmap0", {
layers: 'basic'
});
var layer = new OpenLayers.Layer.Vector("GML", {
strategies: [new OpenLayers.Strategy.Fixed()],
protocol: new OpenLayers.Protocol.HTTP({
url: "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20xml%20where%20url%3D'http%3A%2F%2Fopenlayers.org%2Fdev%2Fexamples%2Fgml%2Fpolygon.xml'",
format: new OpenLayers.Format.GML(),
}),
});
console.log("Layer features # = " + layer.features.length) //a
console.log("Layer features = " + layer.features) //b
map.addLayers([wms, layer]);
map.zoomToExtent(new OpenLayers.Bounds(-3.92, 44.34, 4.87, 49.55));
Whatever I do I only get a = 0 and b = "" ... What am I getting wrong ?
Thanks !
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我在 OpenLayers.Layer.Vector 对象的选项“eventListeners.featuresadded”中找到了解决方案。
这是工作中的jsfiddle： http://jsfiddle.net/AUbZn/16/
I have found the solution in the option 'eventListeners.featuresadded' of the OpenLayers.Layer.Vector object.
here is the working jsfiddle : http://jsfiddle.net/AUbZn/16/