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我是openlayers的新手，对他们的nodejs风格有点困惑，因为我的原因我不能使用nodejs，我正在努力寻找一些好的文档来实现我的目标而不使用NodejS，基本上我需要单击标记并获得与标记相关的弹出窗口以显示有关该标记的一些信息，例如城市名称和人口数量，所有这些信息都是由从服务器收到的 jSon 提供给我的。这是我的 Javascript 脚本和 Html 的一小部分，任何人都可以用一个例子来解释一下吗？

HTML

<div id="mapdiv" style="height: 500px;width: 100%;"><div id="popup"></div></div>

JAVASCRIPT

<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v6.3.1/build/ol.js"></script>
    @Scripts.Render("~/Scripts/jquery-3.3.1.js");
    <script>
        var jsonObject = { "coords": [] };
        $.ajax({
            url: '@Url.Action("GetPlaces", "Place")',   //Indirizzo controller.
            type: 'GET',
            success: function (data) {
                for (var i = 0; i < data.length; i++) {
                    var descr = data[i].descrizione;
                    var coord = data[i];
                    //var coordObj = JSON.stringify(coord);
                    jsonObject['coords'].push(coord);
                }
                //var temp = JSON.stringify(data);
                //geojsonObject = JSON.parse(data);
            },
            async: false
        });


        const features = [];

        for (const coord of jsonObject.coords) {
            features.push(new ol.Feature({
                geometry: new ol.geom.Point(
                    ol.proj.fromLonLat([coord.longitude, coord.latitude]),
                    'XY'
                )
            }));
        }

        const style = new ol.style.Style({
            image: new ol.style.Icon({

                    anchor: [0.5, 0.5],
                    size: [2400, 2400],
                    offset: [52, 0],
                    opacity: 1,
                    scale: 0.012,
                src: "http://localhost:22950/Assets/pin-png-39460.png"
            })
        });

        const vectorSource = new ol.source.Vector({
            features
        });

        const vectorLayer = new ol.layer.Vector({
            source: vectorSource,
            style
        });

        const map = new ol.Map({
            target: 'mapdiv',
            layers: [
                new ol.layer.Tile({
                    source: new ol.source.OSM()
                }),
                vectorLayer
            ],
            view: new ol.View({
                center: ol.proj.fromLonLat([45.32, 8.41]),
                zoom: 3
            })
        });
    </script>

上面的代码运行良好，因为我能够在地图上正确显示标记。

4

1 回答 1

3

下面是一个代码片段，它为标记创建一个弹出窗口（信息窗口），显示name特征的属性。

工作示例

创建弹出窗口并打开它的代码：

/**
 * Elements that make up the popup.
 */
var container = document.getElementById('popup');
var content = document.getElementById('popup-content');
var closer = document.getElementById('popup-closer');

/**
 * Add a click handler to hide the popup.
 * @return {boolean} Don't follow the href.
 */
closer.onclick = function() {
  overlay.setPosition(undefined);
  closer.blur();
  return false;
};

/**
 * Create an overlay to anchor the popup to the map.
 */
var overlay = new ol.Overlay({
  element: container,
  autoPan: true,
  autoPanAnimation: {
    duration: 250
  }
});

/**
* Add a click handler to the map to render the popup.
*/
map.on('singleclick', function(evt) {
  var name = map.forEachFeatureAtPixel(evt.pixel, function(feature) {
    return feature.get('name');
  })
  if (name) {
    container.style.display="block";
    var coordinate = evt.coordinate;
    content.innerHTML = name;
    overlay.setPosition(coordinate);
  } else {
    container.style.display="none";
  }
});

基于以下示例：

结果地图的屏幕截图

var locations = [
  ['Bondi Beach', -33.890542, 151.274856, "green"],
  ['Coogee Beach', -33.923036, 151.259052, "blue"],
  ['Cronulla Beach', -34.028249, 151.157507, "yellow"],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, "purple"],
  ['Maroubra Beach', -33.950198, 151.259302, "red"]
];


/**
 * Elements that make up the popup.
 */
var container = document.getElementById('popup');
var content = document.getElementById('popup-content');
var closer = document.getElementById('popup-closer');


/**
 * Add a click handler to hide the popup.
 * @return {boolean} Don't follow the href.
 */
closer.onclick = function() {
  overlay.setPosition(undefined);
  closer.blur();
  return false;
};


/**
 * Create an overlay to anchor the popup to the map.
 */
var overlay = new ol.Overlay({
  element: container,
  autoPan: true,
  autoPanAnimation: {
    duration: 250
  }
});


var features = [];
for (var i = 0; i < locations.length; i++) {
  features.push(coloredSvgMarker([locations[i][2], locations[i][1]], locations[i][0], locations[i][3]));
}


var vectorSource = new ol.source.Vector({ // VectorSource({
  features: features
});

var vectorLayer = new ol.layer.Vector({ // VectorLayer({
  source: vectorSource
});

var map = new ol.Map({
  layers: [
    new ol.layer.Tile({ // TileLayer({
      source: new ol.source.OSM()
    }), vectorLayer
  ],
  overlays: [overlay],
  target: 'map',
  view: new ol.View({
    center: ol.proj.fromLonLat([-0.12755, 51.507222]),
    zoom: 10
  })
});

// make the map's view to zoom and pan enough to display all the points
map.getView().fit(vectorSource.getExtent(), map.getSize());

/**
 * Add a click handler to the map to render the popup.
 */
map.on('singleclick', function(evt) {
  var name = map.forEachFeatureAtPixel(evt.pixel, function(feature) {
    return feature.get('name');
  })
  if (name) {
    container.style.display = "block";
    var coordinate = evt.coordinate;
    content.innerHTML = name;
    overlay.setPosition(coordinate);
  } else {
    container.style.display = "none";
  }
});
map.on('pointermove', function(evt) {
  map.getTargetElement().style.cursor = map.hasFeatureAtPixel(evt.pixel) ? 'pointer' : '';
});


function coloredSvgMarker(lonLat, name, color, circleFill) {
  if (!color) color = 'red';
  if (!circleFill) circleFill = 'white';
  var feature = new ol.Feature({
    geometry: new ol.geom.Point(ol.proj.fromLonLat(lonLat)),
    name: name
  });
  var svg = '<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="30px" height="30px" viewBox="0 0 30 30" enable-background="new 0 0 30 30" xml:space="preserve">' +
    '<path fill="' + color + '" d="M22.906,10.438c0,4.367-6.281,14.312-7.906,17.031c-1.719-2.75-7.906-12.665-7.906-17.031S10.634,2.531,15,2.531S22.906,6.071,22.906,10.438z"/>' +
    '<circle fill="' + circleFill + '" cx="15" cy="10.677" r="3.291"/></svg>';

  feature.setStyle(
    new ol.style.Style({
      image: new ol.style.Icon({
        anchor: [0.5, 1.0],
        anchorXUnits: 'fraction',
        anchorYUnits: 'fraction',
        src: 'data:image/svg+xml,' + escape(svg),
        scale: 2,
        imgSize: [30, 30],
      })
    })
  );
  return feature;
}
html,
body {
  height: 100%;
  width: 100%;
  padding: 0px;
  margin: 0px;
}

.map {
  height: 100%;
  width: 100%;
}

.ol-popup {
  position: absolute;
  background-color: white;
  -webkit-filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
  filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
  padding: 15px;
  border-radius: 10px;
  border: 1px solid #cccccc;
  bottom: 12px;
  left: -50px;
  min-width: 80px;
}

.ol-popup:after,
.ol-popup:before {
  top: 100%;
  border: solid transparent;
  content: " ";
  height: 0;
  width: 0;
  position: absolute;
  pointer-events: none;
}

.ol-popup:after {
  border-top-color: white;
  border-width: 10px;
  left: 48px;
  margin-left: -10px;
}

.ol-popup:before {
  border-top-color: #cccccc;
  border-width: 11px;
  left: 48px;
  margin-left: -11px;
}

.ol-popup-closer {
  text-decoration: none;
  position: absolute;
  top: 2px;
  right: 8px;
}

.ol-popup-closer:after {
  content: "x";
}
<link rel="stylesheet" href="https://openlayers.org/en/v6.3.0/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v6.3.0/build/ol.js" type="text/javascript"></script>
<div id="map" class="map"></div>
<div id="popup" class="ol-popup">
  <a href="#" id="popup-closer" class="ol-popup-closer"></a>
  <div id="popup-content"></div>
</div>

于 2020-06-13T18:11:56.700 回答