ol.source.vector's loader function is not getting triggered. Can you tell when it doesn't get trigger?

[gaurav-sardana]

_createLayer:function(){ var strategy = ol.loadingstrategy.all; this.source = new ol.source.Vector({ format : new ol.format.GeoJSON(), loader : jQuery.proxy(this.loadFeatures,this), strategy : strategy }); this.setGISLayer(new ol.layer.Vector({ title : this.getLayerId(), source : this.source, style : jQuery.proxy(this.styleFunction, this) })); },

Such after adding the layer to the map, loadfeatures is not getting called. Hence it is getting called only when both map objects(open layers and ol-cesium) having the same target (such that same

element) else if one of them not having target loader will not get triggered. OL Api Version : v5.2.0 ol-cesium version : 2.5

[gberaudo]

What do you mean by:

Hence it is getting called only when both map objects(open layers and ol-cesium) having the same target (such that same element) else if one of them not having target loader will not get triggered.

[gaurav-sardana]

Sorry for the incomprehensible explanation. What I meant that I created two objects, one of map through open layers and other of ol-cesium and a vector layer. var vectorSource = new ol.source.Vector({ format : new ol.format.GeoJSON(), loader : jQuery.proxy(this.loadFeatures,this) }); const vectorLayer = new ol.layer.Vector({ style: styleFunction, source : vectorSource }); this._map = new ol.Map({ layers : [this.getBaseMapLayer(baseMap),vectorLayer], target: 'mapDiv', controls : ol.control.defaults({ attributionOptions : /** @type {olx.control.AttributionOptions} */( { collapsible : true }), zoom : false }), view : this.olView }); this._map3d = new olcs.OLCesium({ map: this._map, // target: 'mapDiv' }); Here If I don't mention target in both the objects, loader specified in ol.source.vector will not get triggered. Such that if I specify target only in ol.Map not in olcs.OLCesium ,such that map is loaded but the loader of ol.source.vector is not getting called. I tried doing the same way as explained in the Old-fashioned example.

Thanks Gaurav

[gberaudo]

OK, I understand now. OL-Cesium has two modes:

• stacked mode: either OpenLayers or Cesium is displayed (no target used for OL-Cesium);
• side-by-side mode: moth OpenLayers and Cesium are displayed at the same time (a target is used for OL-Cesium).

In side-by-side mode OpenLayers is fully active so it will fetch the source data. In stacked mode OpenLayers is partially active: it will not fetch new data and thus they will not be converted to Cesium.

I see 2 solutions: 1- implement fetching of vector source data in OL-Cesium based on the area displayed in Cesium (most complicate); 2- load the data in the vector source yourself (easy).

With 2 you should get the features and add them to the source: vectorSource.setFeatures(theFeaturesYouLoadedManually);

[gaurav-sardana]

I think I am following side-by-side mode in the above example. If the target is specified only for OL-Cesium but not for ol.Map, the loadFeatures callback method is not getting triggered, such that as soon as the layer is added on the map I want to query the features and add to the source, this dynamic behavior can be observed if the loader get executed. Thanks for your explanation! Gaurav.