How to retrieve and list data from sdcard in Firefox OS

link.onclick = function() {
    console.log("display  started");
    link.style.background = "red";
    link.style.color = "black";
    listContents('music');
}

function listContents(storagename) {
    //Clear up the list first
    //  results.html("");
    var files = navigator.getDeviceStorage(storagename);
    console.log("files object "+files);
    var cursor = files.enumerate();
    console.log("cursore object "+cursor);
    cursor.onsuccess = function () {
        //alert("Got something");
        var file = this.result;
        if (file != null) {
            var imageElement = $('<img height="100" width="75">');
            imageElement.attr('src', window.URL.createObjectURL(file));
            $("<p>" + file.name + "," + file.lastModifiedDate + "," + file.type + "," + file.size  + "</p>").appendTo('#results');
            imageElement.appendTo("#results");
            this.done = false;
        } else {
            this.done = true;
        }

        if (!this.done) {
            this.continue();
        }
    }
}

Here, on click of link button I want all the audio files to be displayed in a list. A sample function for it is given, but it is in jquery. I want to implement the function listContents() using pure JavaScript.

Can anyone help, please?