How to show dynamically multiple popup in openlayers 3 map - dictionary

Question

Can anyone tell me how to show all popup of markers in openlayers 3 map. I searched many sites but couldn't get any answer please anyone know about this then help me
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.TileJSON({
url: 'https://api.tiles.mapbox.com/v3/mapbox.geography-class.json?secure',
crossOrigin: 'anonymous'
})
})
],
overlays: [overlay],
target: 'map',
view: new ol.View({
center: ol.proj.fromLonLat([0, 50]),
zoom: 2
})
});
var vectorSource = new ol.source.Vector({
features: [
new ol.Feature({
geometry: new ol.geom.Point(ol.proj.fromLonLat([16.37, 48.2])),
name: 'London'
}),
new ol.Feature({
geometry: new ol.geom.Point(ol.proj.fromLonLat([-0.13, 51.51])),
name: 'NY'
}),
new ol.Feature({
geometry: new ol.geom.Point(ol.proj.fromLonLat([30.69, 55.21])),
name: 'Paris'
})
]
});
var markers = new ol.layer.Vector({
source: vectorSource,
style: new ol.style.Style({
image: new ol.style.Icon({
src: '//openlayers.org/en/v3.12.1/examples/data/icon.png',
anchor: [0.5, 1]
})
})
});
map.addLayer(markers);
function showpopup(){
// For showing popups on Map
var arrayData = [1];
showInfoOnMap(map,arrayData,1);
function showInfoOnMap(map, arrayData, flag) {
var flag = 'show';
var extent = map.getView().calculateExtent(map.getSize());
var id = 0;
var element = document.getElementById('popup');
var popup = new ol.Overlay({
element: element,
positioning: 'center'
});
map.addOverlay(popup);
if (arrayData != null && arrayData.length > 0) {
arrayData.forEach(function(vectorSource) {
/* logMessage('vectorSource >> ' + vectorSource); */
if (vectorSource != null && markers.getSource().getFeatures() != null && markers.getSource().getFeatures().length > 0) {
markers.getSource().forEachFeatureInExtent(extent, function(feature) {
/* logMessage('vectorSource feature >> ' + feature); */
console.log("vectorSource feature >> " + markers.getSource().getFeatures());
if (flag == 'show') {
var geometry = feature.getGeometry();
var coord = geometry.getCoordinates();
popup.setPosition(coord);
/* var prop;
var vyprop = ""; */
$(element).popover({
'position': 'center',
'placement': 'top',
'template':'<div class="popover"><div class="popover-content"></div></div>',
'html': true,
'content': function() {
var string = [];
var st = feature.U.name;
if (st != null && st.length > 0) {
var arrayLength = 1;
string = "<table>";
string += '<tr><td>' + st + "</table>";
}
return string;
}
});
$(element).popover('show');
} else {
$(element).popover('destroy');
}
});
}
});
}
};
}
I used this code in my file but it show only one popup on all markers please someone tell me how to show all markers popup simultaneously.

Answer 1

I'm not sure exactly what you're trying to show in your popups, but I would probably try this approach. This extends the ol.Overlay class, allowing you to get the map object and attach a listener which you can use to grab the feature that was clicked. Is this what you're trying to accomplish?
function PopupOverlay() {
var element = document.createElement('div');
$(element).popover({
template: '<div class="popover"><div class="popover-content"></div></div>',
placement: 'top',
position: 'center',
html: true
});
ol.Overlay.call(this, {
element: element
});
}
ol.inherits(PopupOverlay, ol.Overlay);
PopupOverlay.prototype.setMap = function (map) {
var self = this;
map.on('singleclick', function (e) {
map.forEachFeatureAtPixel(e.pixel, function (feature, layer) {
ol.Overlay.prototype.setPosition.call(self, feature.getGeometry().getCoordinates());
var el = self.getElement();
$(el).data('bs.popover').options.content = function () {
// EDIT THE POPOVER CONTENT
return feature.get('name');
};
$(el).popover('show');
});
});
ol.Overlay.prototype.setMap.call(this, map);
};
Check out this example
So after your comment, I see what you're trying to do now. I would say that you want to take the same basic approach, make a class that overrides ol.Overlay, but this time just loop through all the features, creating an overlay for each feature.
This Updated Example
function PopoverOverlay(feature, map) {
this.feature = feature;
var element = document.createElement('div');
$(element).popover({
template: '<div class="popover"><div class="popover-content"></div></div>',
placement: 'top',
position: 'center',
html: true
});
ol.Overlay.call(this, {
element: element,
map: map
});
};
ol.inherits(PopoverOverlay, ol.Overlay);
PopoverOverlay.prototype.togglePopover = function () {
ol.Overlay.prototype.setPosition.call(this, this.feature.getGeometry().getCoordinates());
var self = this;
var el = this.getElement();
$(el).data('bs.popover').options.content = function () {
// EDIT THE POPOVER CONTENT
return self.feature.get('name');
};
$(el).popover('toggle');
};
// create overlays for each feature
var overlays = (function createOverlays () {
var popupOverlays = [];
vectorSource.getFeatures().forEach(function (feature) {
var overlay = new PopoverOverlay(feature, map);
popupOverlays.push(overlay);
map.addOverlay(overlay);
});
return popupOverlays;
})();
// on click, toggle the popovers
map.on('singleclick', function () {
for(var i in overlays) {
overlays[i].togglePopover();
}
});
Now when you click anywhere on the map, it should call the togglePopover method and toggle the popover on the individual element.