听起来很简单,但我找不到任何新手教程:有没有人能够给我一个简单的例子,如何在OpenLayers中创建(vektor)标记,在鼠标悬停时打开信息窗口,甚至在鼠标移开时关闭它?
我找到了一部分解释,但不是全部...
听起来很简单,但我找不到任何新手教程:有没有人能够给我一个简单的例子,如何在OpenLayers中创建(vektor)标记,在鼠标悬停时打开信息窗口,甚至在鼠标移开时关闭它?
我找到了一部分解释,但不是全部...
以下是如何进行此操作的简单示例,您需要完成以下几个步骤:
创建一个矢量图层以包含您的标记,并将其添加到地图中:
this.markerLayer = new OpenLayers.Layer.Vector(
"My Marker Layer",
{ /* configuration options are set here */ }
);
map.addLayer(this.markerLayer);
创建标记并将其添加到地图上:
var marker = new OpenLayers.Feature.Vector(point, attributes, markerStyle);
this.markerLayer.addFeatures([marker]);
var selectControl = new OpenLayers.Control.SelectFeature(this.markerLayer, {
hover: true
});
selectControl.events.register('featurehighlighted', null, onFeatureHighlighted);
构建您的弹出窗口:
onFeatureHighlighted: function (evt) {
// Needed only for interaction, not for the display.
var onPopupClose = function (evt) {
// 'this' is the popup.
var feature = this.feature;
if (feature.layer) {
selectControl.unselect(feature);
}
this.destroy();
}
feature = evt.feature;
popup = new OpenLayers.Popup.FramedCloud("featurePopup",
feature.geometry.getBounds().getCenterLonLat(),
new OpenLayers.Size(100,100),
"<h2>"+feature.attributes.station_na + "</h2>" +
"Location: " + feature.attributes.location + '<br/>' +
"Elevation: " + feature.attributes.elev_,
null, true, onPopupClose);
feature.popup = popup;
popup.feature = feature;
map.addPopup(popup, true);
}, // ...
marker
和 popup
。var popup;
var marker_layer = new OpenLayers.Layer.Markers( "Markers" );
var size = new OpenLayers.Size(32,32);
var offset = new OpenLayers.Pixel(-(size.w/2), -size.h);
var icon_marker = new OpenLayers.Icon('http://www.openlayers.org/dev/img/marker.png',
size,
offset);
marker = new OpenLayers.Marker(new OpenLayers.LonLat(5.6, 50.6), icon_marker);
//here add mouseover event
marker.events.register('mouseover', marker, function(evt) {
popup = new OpenLayers.Popup.FramedCloud("Popup",
new OpenLayers.LonLat(5.6, 50.6),
null,
'<div>Hello World! Put your html here</div>',
null,
false);
map.addPopup(popup);
});
//here add mouseout event
marker.events.register('mouseout', marker, function(evt) {popup.hide();});
marker_layer.addMarker(marker);
map.addLayer(marker_layer);
这对我有用。最终变得很简单,但花了一段时间:
var marker = new OpenLayers.Marker(position, icon.clone());
boothLayer.addMarker(marker);
marker.events.register('mouseover', marker, function() {
var msg = booth.get('name') +' - ' + booth.get('premises');
var popup = new OpenLayers.Popup.FramedCloud("Popup",
position, null, '<div>'+msg+'</div>', null, false);
map.addPopup(popup);
marker.events.register('mouseout', marker,
setTimeout( function() { popup.destroy(); }, 4000));
});
const interact = new ol.interaction.Select({condition: ol.events.condition.pointerMove});
这指定了在悬停(pointermove)时将选择一个要素。然后将其添加到地图上,并关联应在交互选择要素时调用的函数(即当您悬停在其中一个要素上时)。
map.addInteraction(interact);
interact.on('select', showInfoWindow);
然后您声明显示信息窗口的函数
function showInfoWindow(evt){
if(evt.selected.length>0){
const feature = evt.selected[0];
const id = feature.getId();
infoWindow.innerHTML = '<p>' + id + '</p>';
infoWindow.show();//if you have something like that, you could use an openLayers overlay
}
}
请注意,事件将返回一个对象(在此情况下),您可以在其中的“selected”属性中找到所选要素。当您悬停在其上时。当您取消悬停时,在此情况下,相同的对象将在“deselected”属性中可用,直到您选择新对象。
我使用一个函数来添加它,这是一个简化版本。请注意,在底部设置细节并调用函数。还要注意,您不能在多个图层上拥有多个选择器 - 我认为只有最后一个添加的选择器会起作用,所以如果您想在一个图层中拥有多个特征,则需要进行调整:
function addMarkerLayer(markerInfo){
var details= markerInfo.details || "<h3>"+markerInfo.title+"</h3>"+
"[Location] Lat:"+markerInfo.latitude + " Lon:"+markerInfo.longitude;
var features=[];
features.push(new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point(markerInfo.longitude, markerInfo.latitude),
{title: markerInfo.title, details:details, externalGraphic:markerInfo.icon},
{
externalGraphic:markerInfo.icon,
fillColor: markerInfo.markerColor || '#ff0',
fillOpacity: markerInfo.iconOpacity || 0.8,
graphicWidth : markerInfo.iconSize || 24,
graphicHeight : markerInfo.iconSize || 24,
strokeColor: markerInfo.markerStrokeColor || "#ee9900",
strokeOpacity: 1,
strokeWidth: 1,
pointRadius: 7
}
));
// create the layer with listeners to create and destroy popups
var vector = new OpenLayers.Layer.Vector(markerInfo.layerName, {
eventListeners: {
'featureselected': function(evt) {
var feature = evt.feature;
var popup = new OpenLayers.Popup.FramedCloud("popup",
OpenLayers.LonLat.fromString(feature.geometry.toShortString()),
null,
feature.attributes.details,
null,
true);
feature.popup = popup;
map.addPopup(popup);
},
'featureunselected': function(evt) {
var feature = evt.feature;
map.removePopup(feature.popup);
feature.popup.destroy();
feature.popup = null;
}
}
});
vector.addFeatures(features);
var selector = new OpenLayers.Control.SelectFeature(vector, {
hover: true
});
map.addLayer(vector);
map.addControl(selector);
}
var markerInfo={
title:'Washington DC',
latitude:38.8,
longitude:-77,
icon:"/icons/event.png",
iconSize:24
};
addMarkerLayer(markerInfo);
听起来你想看看"OpenLayers.Popup()"。
这个例子展示了在你画一个多边形后点击它弹出一个弹窗,但是你应该可以改变它来响应悬停而不是点击。 http://openlayers.org/dev/examples/select-feature-openpopup.html