Cesium API Sample - Interactive KML Loading

Relevant Cesium Source

Relevant Google Earth Source (link)

var currentKmlObject = null;

function fetchKmlFromInput() {
                        // remove the old KML object if it exists
                        if (currentKmlObject) {
                            ge.getFeatures().removeChild(currentKmlObject);
                            currentKmlObject = null;
                        }

var kmlUrlBox = document.getElementById('kml-url');
                        var kmlUrl = kmlUrlBox.value;

google.earth.fetchKml(ge, kmlUrl, finishFetchKml);
                    }

function finishFetchKml(kmlObject) {
                        // check if the KML was fetched properly
                        if (kmlObject) {
                            // add the fetched KML to Earth
                            currentKmlObject = kmlObject;
                            ge.getFeatures().appendChild(currentKmlObject);
                        } else {
                            // wrap alerts in API callbacks and event handlers
                            // in a setTimeout to prevent deadlock in some browsers
                            setTimeout(function() {
                                alert('Bad or null KML.');
                            }, 0);
                        }
                    }