如何将 object 中的文本分配给具有相同索引的标记并在单击相关标记后显示相关文本？ （Openlayers贴图）

Question

I use OpenLayers map and I would like to get some text from var informations after click to marker. I think thant I need to have "general" function about singleclick in cycle for, because I need do it for each index [i]. But If I click to some marker I don´t see any information.

I tried to move "general" function to down before console.table(window.phpdata.markers) . When I run it, I can see last text from "informations" after click on each marker --> there isn´t any problem with getting data from databases.

(This isn´t required result because I don´t want to see last marker. I would like to see relevant text from informations for relevant marker. So with same index [i].

What to do for this result? Thank´s

Object.defineProperty(window.phpdata, "markers", {value: <?php echo !empty($list) ? json_encode($list) : 'null'; ?>, writable: false, configurable: false});
var base = new ol.layer.Tile({
    source: new ol.source.OSM()
  });

var map = new ol.Map({
    target: 'map',
    layers: [base],
    view: new ol.View({
        center: ol.proj.fromLonLat([-74.0061,40.712]), zoom: 2
    })
});

var vectors = new ol.source.Vector({});

if(window.phpdata.markers && window.phpdata.markers.length > 0) {
        var data = window.phpdata.markers;

  for(var i = 0; i < data.length; i++) {
      var informations = data[i].info;



        var marker = new ol.Feature({
                geometry: new ol.geom.Point(
                ol.proj.fromLonLat([Number(data[i].lng), Number(data[i].lat)])
                ),
                });

                marker.setStyle(new ol.style.Style({
                image: new ol.style.Icon(({
                src: 'dot.png'
                }))
                }));

                vectors.addFeature(marker);

                marker.on('singleclick', function (event) {            //general function to move..
                     if (map.hasFeatureAtPixel(event.pixel) === true) {
                        document.getElementById("www").innerHTML=informations;
                     } else {
                         overlay.setPosition(undefined);
                         closer.blur();
                     }
                 });                                            // //to there

        }

        var layer = new ol.layer.Vector({
        source: vectors,
        });

        map.addLayer(layer);
}


document.getElementById('myposition').innerText = "click to map and get coordinates here";
map.on('singleclick', event => {
  const coordinate = ol.proj.toLonLat(event.coordinate);
  //const innerText = `Lon: ${coordinate[0].toFixed(4)}, Lat: ${coordinate[1].toFixed(4)}`;
  const innerText = `${coordinate[0].toFixed(4)}, ${coordinate[1].toFixed(4)}`;
  document.getElementById('myposition').innerText = innerText;
});


map.on('pointermove', function(evt) {
    map.getTargetElement().style.cursor = map.hasFeatureAtPixel(evt.pixel) ? 'pointer' : '';
});


console.table(window.phpdata.markers)

Answer 1

Features do not have click events. You need to check if there are features where you click the map. You can add the info as a property to the feature and use get() to display it.

for(var i = 0; i < data.length; i++) {
    var marker = new ol.Feature({
        geometry: new ol.geom.Point(
            ol.proj.fromLonLat([Number(data[i].lng), Number(data[i].lat)])
        ),
        info: data[i].info
    });
}

....
....

map.on('click', function(evt) {
    var feature = map.forEachFeatureAtPixel(evt.pixel,
        function(feature) {
            return feature;
        });
    if (feature) {
        document.getElementById("www").innerHTML = feature.get('info');
        ....
    };
});