OpenLayers-2.13.1 用选择器框选多个矢量图层中的多个要素
map中共有3个图层，一个是wms的地图，另外两个是矢量图层。map中共有2个控制器，一个是图层切换控制器，这个控制器可以没有。另外一个控制器是矢量图层的要素选择控制器。
注意：1、矢量图层在初始化的时候要定义内部要素的样式。
2、要素选择控制器的配置。
3、要素选择事件要注册。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>SelectFeature Control on multiple vector layers</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
#controlToggle li {
list-style: none;
}
</style>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
//声明map和选择控制器
var map, selectControl;
//设置默认矢量要素的线宽2
OpenLayers.Feature.Vector.style['default']['strokeWidth'] = '2';
function init(){
//初始化map
map = new OpenLayers.Map('map');
//声明一个wms图层
var wmsLayer = new OpenLayers.Layer.WMS(
"OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0",
{layers: 'basic'}
);
// allow testing of specific renderers via "?renderer=Canvas", etc
var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
//声明一个矢量图层和定义图层里面要素的样式(默认显示图片,选中后显示另一个图片）
var vectors1 = new OpenLayers.Layer.Vector("Vector Layer 1", {
renderers: renderer,
styleMap: new OpenLayers.StyleMap({
"default": new OpenLayers.Style(OpenLayers.Util.applyDefaults({
externalGraphic: "../img/marker-green.png",
graphicOpacity: 1,
rotation: -45,
pointRadius: 10
}, OpenLayers.Feature.Vector.style["default"])),
"select": new OpenLayers.Style({
externalGraphic: "../img/marker-blue.png"
})
})
});
//声明另一个矢量图层和定义图层里面要素的样式
var vectors2 = new OpenLayers.Layer.Vector("Vector Layer 2", {
renderers: renderer,
styleMap: new OpenLayers.StyleMap({
"default": new OpenLayers.Style(OpenLayers.Util.applyDefaults({
fillColor: "red",
strokeColor: "gray",
graphicName: "square",
rotation: 45,
pointRadius: 15
}, OpenLayers.Feature.Vector.style["default"])),
"select": new OpenLayers.Style(OpenLayers.Util.applyDefaults({
graphicName: "square",
rotation: 45,
pointRadius: 15
}, OpenLayers.Feature.Vector.style["select"]))
})
});
//地图添加2个矢量图层
map.addLayers([wmsLayer, vectors1, vectors2]);
//地图添加图层控制器
map.addControl(new OpenLayers.Control.LayerSwitcher());
//初始化选择控制器
selectControl = new OpenLayers.Control.SelectFeature(
[vectors1, vectors2],//注意此行，这是选择控制器的目标图层，这里有2个
{
clickout: true, //点击空白取消选择
toggle: false,
box: true,//允许框选
multiple: false, hover: false,
toggleKey: "ctrlKey", // ctrl key removes from selection
multipleKey: "shiftKey" // shift key adds to selection
}
);
//地图添加选择控制器
map.addControl(selectControl);
//激活选择控制器
selectControl.activate();
//设置地图中心点
map.setCenter(new OpenLayers.LonLat(0, 0), 3);
//两个矢量图层里面添加要素
vectors1.addFeatures(createFeatures());
vectors2.addFeatures(createFeatures());
//注册矢量图层的要素选中事件和取消选中事件
vectors1.events.on({
"featureselected": function(e) {
showStatus("selected feature "+e.feature.id+" on Vector Layer 1");
},
"featureunselected": function(e) {
showStatus("unselected feature "+e.feature.id+" on Vector Layer 1");
}
});
vectors2.events.on({
"featureselected": function(e) {
showStatus("selected feature "+e.feature.id+" on Vector Layer 2");
},
"featureunselected": function(e) {
showStatus("unselected feature "+e.feature.id+" on Vector Layer 2");
}
});
}
//返回10个点要素
function createFeatures() {
var extent = map.getExtent();
var features = [];
for(var i=0; i<10; ++i) {
features.push(new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point(extent.left + (extent.right - extent.left) * Math.random(),
extent.bottom + (extent.top - extent.bottom) * Math.random()
)));
}
return features;
}
function showStatus(text) {
document.getElementById("status").innerHTML = text;
}
</script>
</head>
<body onload="init()">
<h1 id="title">OpenLayers Select Feature on Multiple Layers Example</h1>
<div id="tags">
vector, feature, selecting, selection, advanced, light
</div>
<p id="shortdesc">
Select a feature on click with the Control.SelectFeature on multiple
vector layers.
</p>
<div id="map" class="smallmap"></div>
<div id="status"></div>
</body>
</html>
转载自：https://blog.csdn.net/u010299411/article/details/73395788
