CZML did reach track end callback

CesiumJS
1

1. A concise explanation of the problem you're experiencing.

I need to know when an entity reaches the end of its positions, to trigger some events.
I tried to use range: 'LOOP_STOP', but the animation starts again from the beginning.
I also tried to check if currentTime is greater than endDate, but as CZML is loaded asynchronously, I sometimes have a noticeable difference.

2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.

                var czml = [{
      id : 'document',
      name : 'CZML Path',
      version : '1.0',
      clock: {
        interval: startDate.toISOString() + '/' + endDate.toISOString(),
        currentTime: startDate.toISOString(),
        multiplier: 1,
        range: 'LOOP_STOP',
      }
    }, {
      id : 'path',
      name : 'path data',
      description : 'hike trace',
      availability : startDate.toISOString() + '/' + endDate.toISOString(),
      billboard : {
        image : './data/images/Status/Orange-26x26.png'
      },
      position : {
        epoch : startDate.toISOString(),
        cartographicDegrees :
      }
    }];

    var coords = ;
    for (var i=0; i<pathGeojson.geometry.coordinates.length; i++) {
      var currentCoordinates = pathGeojson.geometry.coordinates[i];
      coords = coords.concat(Cesium.Cartographic.fromDegrees(currentCoordinates[0], currentCoordinates[1]));
    }

    var promise = Cesium.sampleTerrainMostDetailed(Cesium.createWorldTerrain(), coords);
    promise.then(function(updatedPositions) {

      for (var i=0; i < pathGeojson.geometry.coordinates.length; i++) {
        var coordinates = [i/timeDivider].concat(pathGeojson.geometry.coordinates[i].slice(0,2).concat(updatedPositions[i].height + 1));
        czml[1].position.cartographicDegrees = czml[1].position.cartographicDegrees.concat(coordinates);
      }

      viewer.flyTo(layers.startMarkerLayer.entities.values[0])
      .then(function() {
        Cesium.CzmlDataSource.load(czml)
        .then(
          function(currentCZML) {
            viewer.dataSources.add(currentCZML);
            viewer.trackedEntity = currentCZML.entities.getById('path');
          }
        );
      });

    });

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

I have a button which will zoom on the first point of a polyline, then load it as a CZML to track it to the end. While the tracking is on, the start button is replaced with a stop button. If the tracking reaches the end before someone clicks the stop button, I want to stop the tracking manually, unload the CZML, and replace the stop button with a start button.

4. The Cesium version you're using, your operating system and browser.

Cesium 1.46, Safari 11.1.1, macOS 10.13.5

2

You can get the DataSourceClock associated with that DataSource once loaded, and get the stop time from that:

var stop = currentCZML.clock.stopTime;

``

Thanks,

Gabby