OpenLayers 3 Remote JSON Data - openlayers-3

Question

I have a remote JSON file with a list of houses in inventory. I wan't to plot these on an OL map. The JSON is coming from an API and isn't in standard GeoJSON. I need to get the coordinates from a collection called inventory which is nested one level down from the root object. How can I do this OL 3. In OL2 I did this using the protocol.Script() and on read parsing out the nested items that I needed. So far I have:
var myLayer = new ol.layer.Vector({
title: "Inventory",
source: new ol.source.Vector({
format: new ol.format.GeoJSON({
projection : "EPSG:4326",
url: "http://some.closed.api/inventory/",
strategy: ol.loadingstrategy.bbox
})
})
});
Any pointers to the most efficient way to do this would be appreciated.

Answer 1

I ended up with this solution:
var olSource = new ol.source.Vector(),
layer = new ol.layer.Vector({
source: olSource
});
function successHandler( data ) {
var transform = ol.proj.getTransform(
"EPSG:4326",
map.getView().getProjection()
);
var rootObj = "inventory",
items = data[ rootObj ] ? data[ rootObj ] : data;
items.forEach( function( item ) {
var feature = new ol.Feature( item );
var coordinate = transform(
[ parseFloat( item.longitude ), parseFloat( item.latitude) ]
);
var geometry = new ol.geom.Point( coordinate );
feature.setGeometry( geometry );
olSource.addFeature( feature );
});
}
$.ajax({
url: "http://some.closed.api/inventory",
dataType: 'jsonp',
params: { q: "seattle" },
jsonpCallback: "callback",
success: successHandler
});