如何在OpenLayers中访问已加载的GML文件的功能？

2019年8月3日 443次阅读

我似乎无法访问加载的GML文件的功能.我将使用OpenLayers的基本示例来演示我想要做的事情：

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,我只得到一个= 0和b =“”……我出错了什么？

谢谢 ！

最佳答案 我在OpenLayers.Layer.Vector对象的’eventListeners.featuresadded’选项中找到了解决方案.

eventListeners: {
    "featuresadded": dataLoaded
},

这是工作的jsfiddle：http://jsfiddle.net/AUbZn/16/

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