function handleDrop(evt)
    {
        evt.preventDefault();

        splashScreen.dataset.state = "hidden";

        document.getElementById('progress-holder').style.display = 'inline';

        let files = evt.dataTransfer.files; // FileList object.
        loadDroppedAnimation(files[0]).then((evt) => {
            return JSON.parse(evt.target.result);
        }).then((dat) => {
            loadNewVisualizer(dat).then(() => {
                updateControls();
            });
        });
    }
/* ------------------------------------------------------------------------
     * handleDrop:
     * ------------------------------------------------------------------------
     * param evt - Javascript event
     *
     * Callback function for the Javascript 'drop' event used to handle a file
     * being dropped within the area of the visualizer.
     */


param evt - Javascript event

Callback function for the Javascript 'drop' event used to handle a file
being dropped within the area of the visualizer.
param evt - Javascript event Callback function for the Javascript ' drop ' event used to handle a file being dropped within the area of the visualizer .
function handleDrop(evt)
    {
        evt.preventDefault();
        splashScreen.dataset.state = "hidden";
        document.getElementById('progress-holder').style.display = 'inline';
        let files = evt.dataTransfer.files; 
        loadDroppedAnimation(files[0]).then((evt) => {
            return JSON.parse(evt.target.result);
        }).then((dat) => {
            loadNewVisualizer(dat).then(() => {
                updateControls();
            });
        });
    }
function handleDrop ( evt ) { evt . preventDefault ( ) ; splashScreen . dataset . state = "hidden" ; document . getElementById ( 'progress-holder' ) . style . display = 'inline' ; let files = evt . dataTransfer . files ; loadDroppedAnimation ( files [ 0 ] ) . then ( ( evt ) => { return JSON . parse ( evt . target . result ) ; } ) . then ( ( dat ) => { loadNewVisualizer ( dat ) . then ( ( ) => { updateControls ( ) ; } ) ; } ) ; }
handleDrop:
handleDrop :
// FileList object.