select-feature openlayers2.13.1向量圖層的要素選擇 框選 點選
阿新 • • 發佈：2019-01-04
<!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; //定義要素的向量圖的樣式的線寬 OpenLayers.Feature.Vector.style['default']['strokeWidth'] = '2'; function init(){ //初始化map map = new OpenLayers.Map('map'); //宣告並初始化一個WMS圖層 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; //?: 運算子是 if...else 語句的快捷方式 renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers; //宣告並初始化一個向量圖層 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新增2個圖層 map.addLayers([wmsLayer, vectors]); map.addControl(new OpenLayers.Control.LayerSwitcher()); //5個控制器 drawControls = { //點 point: new OpenLayers.Control.DrawFeature( vectors, OpenLayers.Handler.Point ), //線 line: new OpenLayers.Control.DrawFeature( vectors, OpenLayers.Handler.Path ), //多邊形 polygon: new OpenLayers.Control.DrawFeature( vectors, OpenLayers.Handler.Polygon ), //選擇 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 } ), //懸浮選擇 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新增5個控制器 for(var key in drawControls) { map.addControl(drawControls[key]); } //設定map的中心點 map.setCenter(new OpenLayers.LonLat(0, 0), 3); } //5大功能切換 function toggleControl(element) { for(key in drawControls) { var control = drawControls[key]; if(element.value == key && element.checked) { //啟用控制器 control.activate(); } else { //關閉控制器 control.deactivate(); } } } //處理兩個多選框處理 function update() { //選中點選空白處的配置 var clickout = document.getElementById("clickout").checked; if(clickout != drawControls.select.clickout) { drawControls.select.clickout = clickout; } //選中框選後的配置 var box = document.getElementById("box").checked; if(box != drawControls.select.box) { drawControls.select.box = box; if(drawControls.select.active) { //重新啟用選擇控制器 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. 使用懸浮或者點選操作選擇一個要素。在向量圖層上選擇要素。（一般每個向量圖層上都可以放置N多個要素。） </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導航選單</label> </li> <li> <input type="radio" name="type" value="point" id="pointToggle" onclick="toggleControl(this);" /> <label for="pointToggle">draw point畫點</label> </li> <li> <input type="radio" name="type" value="line" id="lineToggle" onclick="toggleControl(this);" /> <label for="lineToggle">draw line畫線</label> </li> <li> <input type="radio" name="type" value="polygon" id="polygonToggle" onclick="toggleControl(this);" /> <label for="polygonToggle">draw polygon畫多邊形</label> </li> <li> <input type="radio" name="type" value="selecthover" id="selecthoverToggle" onclick="toggleControl(this);" /> <label for="selecthoverToggle">Select features on hover懸浮時選擇要素</label> </li> <li> <input type="radio" name="type" value="select" id="selectToggle" onclick="toggleControl(this);" /> <label for="selectToggle">select feature 選擇要素(<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框選要素</label> </li> <li> <input id="clickout" type="checkbox" name="clickout" onchange="update()" /> <label for="clickout">click out to unselect features點選空白取消選擇要素</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鍵新增要素。用ctrl鍵減去要素。</p> </body> </html>