如何在鼠标悬停和单击时在 OpenLayers 5 中实现功能弹出窗口

Question

我了解到 OpenLayer 2 有一个 OpenLayer.control.featurepopup 控件，允许添加弹出窗口，当您将鼠标悬停在地图上的某个要素上以及单击某个要素时会显示该弹出窗口。我正在寻找一种方法来使用 OpenLayer 5

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Testing Popups</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <style>
        /* Always set the map height explicitly to define the size of the div
         * element that contains the map. */
        #map {
            height: 700px;
        }
    </style>

    <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js"></script>
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
</head>
<body>
Popop!!!!
<div id="map"></div>

<script>
    var style,feature, map,vLayer,vSource,fpControl;
    $(document).ready(function () {
        style = [
            new ol.style.Style({
                image: new ol.style.Icon(({
                    scale: .7, opacity: 1,
                    rotateWithView: false, anchor: [0.5, 1],
                    anchorXUnits: 'fraction', anchorYUnits: 'fraction',
                    src: '//raw.githubusercontent.com/jonataswalker/map-utils/master/images/marker.png'
                })),
                zIndex: 5
            })
        ];

        feature = new ol.Feature({
            geometry: new ol.geom.Point(new ol.proj.fromLonLat([-0.890000,51.57889])),
            name: 'My Bus'
        });
        feature.setId(1007);
        feature.setStyle(style);

        // Create map
        vSource = new ol.source.Vector();
        vLayer = new ol.layer.Vector({
            source : vSource
        });
        var map = new ol.Map({
            target: 'map',
            layers: [
                new ol.layer.Tile({
                    source: new ol.source.OSM()
                }),
                vLayer
            ],
            view: new ol.View({
                center: new ol.proj.fromLonLat([-0.890000,51.57889]),
                zoom: 12,
                numZoomLevels: 18,
                maxResolution: 156543.0339,
            })
        });

        vSource.addFeature(feature);

        fpControl = new ol.Control.FeaturePopups({
            boxSelectionOptions: {},
            layers: [
               [
                    // Uses: Internationalized templates.
                    vLayer, {
                        templates: {
                            hover: '${.name}',
                            single: '${i18n("Name")}: ${.name}<br>',
                            item: '<li><a href="#" ${showPopup()}>${.name}</a></li>'
                        }
                    }
                ]
            ]
        });
        map.addControl(fpControl);
    });
</script>
</body>
</html>

我希望当我将鼠标悬停在该功能上时看到一个工具提示显示该功能的一些属性，例如 'name' 和 'id'，当我单击功能。

Answer 1

    .popup {
        border-radius: 5px;
        border: 1px solid grey;
        background-color: rgba(255, 255, 255, 0.9);
        padding: 2px;
    }

    <div id="map"></div>
    <div #popup class="popup" [hidden]="true"></div>

    this.popupOverlay = new Overlay({
        element: this.popup.nativeElement,
        offset: [9, 9]
    });
    this.map.addOverlay(this.popupOverlay);

    this.map.on('pointermove', (event) => {
        let features = [];
        this.map.forEachFeatureAtPixel(event.pixel,
            (feature, layer) => {
                features = feature.get('features');
                const valuesToShow = [];
                if (features && features.length > 0) {
                    features.forEach( clusterFeature => {
                        valuesToShow.push(clusterFeature.get('VALUE_TO_SHOW'));
                    });
                    this.popup.nativeElement.innerHTML = valuesToShow.join(', ');
                    this.popup.nativeElement.hidden = false;
                    this.popupOverlay.setPosition(event.coordinate);
                }
            },
            { layerFilter: (layer) => {
                return (layer.type === new VectorLayer().type) ? true : false;
            }, hitTolerance: 6 }
        );
        if (!features || features.length === 0) {
            this.popup.nativeElement.innerHTML = '';
            this.popup.nativeElement.hidden = true;
        }
    });

Obi，我在悬停功能弹出时遇到了同样的问题。我使用了 OpenLayers 5 和 Angular 6.

我设法通过创建一个 <div> 弹出元素并在 Overlay 中引用该元素来解决它。

向地图对象添加了叠加层并在地图上定义了一个 pointermove 事件。在 pointermove 事件中，我引用地图并使用 forEachFeatureAtPixel 方法。

悬停功能的基础层对我来说是 ClusterSource，因此多个点特征被分组在一个特征下。

参考文献：

如何在鼠标悬停和单击时在 OpenLayers 5 中实现功能弹出窗口

How To Implement Feature Popups in OpenLayers 5 on Mouse Hover and Click

popup

openlayers-5