How to use file from <input type="file"> in SheetJS's XSLX?

I want to be able to upload .xlsx file to webpage to later use values from .xlsx's cells in javascript code. How can I combine code and SheetJS's XLSX to do that?

I did:

$('#input-excel').change(function (e) {
    var reader = new FileReader();
    reader.readAsArrayBuffer(e.target.files[0]);
    reader.onload = function (e) {
        var data = new Uint8Array(reader.result);
        var workbook = XLSX.read(data, {type: 'array'});
        var sheet = workbook.Sheets[workbook.SheetNames[0]];
        var cell_ref = XLSX.utils.encode_cell({c: 1, r: 2});
        var cell = sheet[cell_ref];
        console.log(cell.v);
    };
}

Empty cell will not work, it needs to have value in worksheet.