Can't access KML features - openlayers-3

Question

I am loading a KML file locally and I have been able to add it to the map successfully. However, I want to interate over the features and can't seem to get anything to work. My code currently:
var myLayer = new ol.layer.Vector({
source: new ol.source.Vector({
url: '/kml/sample.kml',
format: new ol.format.KML()
})
});
// Iterate over features *NOT WORKING*
myLayer.getSource().forEachFeature(function(e) {
console.log(e);
})
Any pointers on how I can get the forEachFeature to function, or any alternative method, would be great.

Answer 1

The code in your question works fine, except that the features are loaded asynchronously. Most of the time it will first execute forEachFeature, which finds 0 features to loop through and afterwards the features are loaded.
You may find out that a single feature is loaded by listening for the addfeature event of the source and maybe you can make your desired changes there for each feature separately:
var id = 1;
myLayer.getSource().on('addfeature', function (ev_add) {
console.log(ev_add.feature);
ev_add.feature.once('change', function (ev_change) {
console.log(ev_change.target.getId());
});
ev_add.feature.setId(x);
x += 1;
});
If you must wait until all features are loaded, the change event of the layer can help:
myLayer.once('change', function () {
myLayer.getSource().forEachFeature(function (feature) {
console.log(feature);
});
});
Edit: You are right, the addfeature event handler has the event object as parameter. To your question about setting the ID while adding features, I think that this is again a problem of waiting until the changes are done. I made the amendments in the first snippet.

Answer 2

I found a way to get this to work. Not sure if it's the most efficient however:
var featProj = map.getView().getProjection();
var kmlFormat = new ol.format.KML();
var myLayer = new ol.layer.Vector();
var vectorSource = new ol.source.Vector({
loader: function() {
$.ajax( {
url: '/kml/my.kml',
success: function( data ) {
var features = kmlFormat.readFeatures( data, { featureProjection: featProj } );
vectorSource.addFeatures( features );
// iterate over features
vectorSource.forEachFeature( function( feature ) {
//do something
console.log( feature );
});
}
});
},
strategy: ol.loadingstrategy.bbox
});
myLayer.setSource( vectorSource );