select-feature openlayers2.13.1矢量图层的要素选择 框选 点选
<!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 Layer.Vector</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">
var map, drawControls;
//定义要素的矢量图的样式的线宽
OpenLayers.Feature.Vector.style['default']['strokeWidth'] = '2';
function init(){
//初始化map
map = new OpenLayers.Map('map');
//声明并初始化一个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;
//?: 运算符是 if...else 语句的快捷方式
renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
//声明并初始化一个矢量图层
var vectors = new OpenLayers.Layer.Vector("Vector Layer", {
renderers: renderer
});
vectors.events.on({
'featureselected': function(feature) {
document.getElementById('counter').innerHTML = this.selectedFeatures.length;
},
'featureunselected': function(feature) {
document.getElementById('counter').innerHTML = this.selectedFeatures.length;
}
});
//map添加2个图层
map.addLayers([wmsLayer, vectors]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
//5个控制器
drawControls = {
//点
point: new OpenLayers.Control.DrawFeature(
vectors, OpenLayers.Handler.Point
),
//线
line: new OpenLayers.Control.DrawFeature(
vectors, OpenLayers.Handler.Path
),
//多边形
polygon: new OpenLayers.Control.DrawFeature(
vectors, OpenLayers.Handler.Polygon
),
//选择
select: new OpenLayers.Control.SelectFeature(
vectors,
{
clickout: false, toggle: false,
multiple: false, hover: false,
toggleKey: "ctrlKey", // ctrl key removes from selection
multipleKey: "shiftKey", // shift key adds to selection
box: true
}
),
//悬浮选择
selecthover: new OpenLayers.Control.SelectFeature(
vectors,
{
multiple: false, hover: true,
toggleKey: "ctrlKey", // ctrl key removes from selection
multipleKey: "shiftKey" // shift key adds to selection
}
)
};
//map添加5个控制器
for(var key in drawControls) {
map.addControl(drawControls[key]);
}
//设置map的中心点
map.setCenter(new OpenLayers.LonLat(0, 0), 3);
}
//5大功能切换
function toggleControl(element) {
for(key in drawControls) {
var control = drawControls[key];
if(element.value == key && element.checked) {
//激活控制器
control.activate();
} else {
//关闭控制器
control.deactivate();
}
}
}
//处理两个多选框处理
function update() {
//选中点击空白处的配置
var clickout = document.getElementById("clickout").checked;
if(clickout != drawControls.select.clickout) {
drawControls.select.clickout = clickout;
}
//选中框选后的配置
var box = document.getElementById("box").checked;
if(box != drawControls.select.box) {
drawControls.select.box = box;
if(drawControls.select.active) {
//重新激活选择控制器
drawControls.select.deactivate();
drawControls.select.activate();
}
}
}
</script>
</head>
<body onload="init()">
<h1 id="title">OpenLayers Select Feature Example</h1>
<div id="tags">
vector, feature, selecting, selection, advanced
</div>
<p id="shortdesc">
Select a feature on hover or click with the Control.SelectFeature on a vector layer.
使用悬浮或者点击操作选择一个要素。在矢量图层上选择要素。（一般每个矢量图层上都可以放置N多个要素。）
</p>
<div id="map" class="smallmap"></div>
<ul id="controlToggle">
<li>
<input type="radio" name="type" value="none" id="noneToggle"
onclick="toggleControl(this);" checked="checked" />
<label for="noneToggle">navigate导航菜单</label>
</li>
<li>
<input type="radio" name="type" value="point" id="pointToggle"
onclick="toggleControl(this);" />
<label for="pointToggle">draw point画点</label>
</li>
<li>
<input type="radio" name="type" value="line" id="lineToggle"
onclick="toggleControl(this);" />
<label for="lineToggle">draw line画线</label>
</li>
<li>
<input type="radio" name="type" value="polygon" id="polygonToggle"
onclick="toggleControl(this);" />
<label for="polygonToggle">draw polygon画多边形</label>
</li>
<li>
<input type="radio" name="type" value="selecthover" id="selecthoverToggle"
onclick="toggleControl(this);" />
<label for="selecthoverToggle">Select features on hover悬浮时选择要素</label>
</li>
<li>
<input type="radio" name="type" value="select" id="selectToggle"
onclick="toggleControl(this);" />
<label for="selectToggle">select feature 选择要素(<span id="counter">0</span> features selected)</label>
<ul>
<li>
<input id="box" type="checkbox" checked="checked"
name="box" onchange="update()" />
<label for="box">select features in a box框选要素</label>
</li>
<li>
<input id="clickout" type="checkbox"
name="clickout" onchange="update()" />
<label for="clickout">click out to unselect features点击空白取消选择要素</label>
</li>
</ul>
</li>
</ul>
<p>Use the shift key to select multiple features. Use the ctrl key to
toggle selection on features one at a time. Note: the "clickout" option has no
effect when "hover" is selected.用shift键添加要素。用ctrl键减去要素。</p>
</body>
</html>
转载自：https://blog.csdn.net/u010299411/article/details/73359774
