注意我也在How do I get the DOM element from openlayers vector feature
如果您想在悬停时找到鼠标或功能的位置以便显示自定义叠加层,请创建自定义悬停控件并定义 featurehighlighted 函数,如下所示:
var featureHoverControl = new OpenLayers.Control.SelectFeature([myLayer], {
id: 'featureHoverControl',
hover: true,
autoActivate: true,
highlightOnly: true,
renderIntent: "temporary",
eventListeners: {
featurehighlighted: function(e) {
// either use the mouse's position when the event was triggered
var mouseXPosition = this.handlers.feature.evt.x;
var mouseYPosition = this.handlers.feature.evt.y;
// or retrieve the feature's center point
var featureCenterLonLat = e.feature.geometry.bounds.getCenterLonLat();
var featureCenterPoint = map.getPixelFromLonLat(featureCenterLonLat);
// display your custom popup here
// e.g. showTooltip(e.feature.attributes.name, featureCenterPoint.x, featureCenterPoint.y)
}
,
featureunhighlighted: function(e) {
// hide your custom popup here
// e.g. hideTooltip()
}
}
});
map.addControl(featureHoverControl);
如果您需要访问代表您的图层/功能的 SVG 元素(如果您使用的是第三方库并且您不想修改源代码),请使用以下任一行(取决于您是否需要层或特征):
var layerElement = map.getLayersByName("My Layer")[0].features.root;
var layerElementId = map.getLayersByName("My Layer")[0].features.root.id;
var featureElementId = map.getLayersByName("My Layer")[0].getFeaturesByAttribute("name","My Feature Name")[0].geometry.components[0].id;
请注意,由于这仅获取元素的 id,因此您仍然需要使用适当的方法来获取对元素本身的引用。类似于以下任一内容:
var elementReference1 = document.getElementById(featureElementId);
var elementReference2 = jQuery('#'+featureElementId)[0];