parse geoJSON using bounding box and Openlayers 3

Question

I have used Openlayers 3 to give me a bounding box extent and then make a WFS call to Geoserver using those extents and returning a geoJSON and it has worked perfectly, giving me the features within the bounding box from the complete dataset.

Now I have a geoJSON that already is a complete dataset and a local file and not coming back as WFS call. Is it possible to get select features from that geoJSON based off the OL3 bounding box function?

Answer 1

You can use the function getFeaturesInExtent(extent), after you read your local geojson file.

So this code should work for you:

vectorLayer = new ol.layer.Vector({
              title: 'Layer',
              source: new ol.source.GeoJSON({
                  projection : 'EPSG:3857',
                 url: 'local_geojson_data.json'
})}) ; //layer viewing the whole data

var selected_features = vectorLayer.getSource.getFeaturesInExtent([minx, miny, maxx, maxy]);
//select only features in extent

selected_vectorLayer = new ol.layer.Vector({
              title: 'selected_Layer',
              source: new ol.source.Vector({
                  features : selected_features
})}) ; //draw those features in a new layer