excel2json/worker.html at master · raggeler/excel2json · GitHub

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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Excel 2 JSON</title>
    <style>
        #text1, #text2 {
            width:80%; height: 300px; display: block; margin:10px;
        }
    </style>
</head>
<body>
    <h3>Select an XLSX file for conversion</h3>
    <input type="file" id="convert-button">
    <textarea id="text1"></textarea>
    <textarea id="text2"></textarea>

    <script type="module">
    import MyWorker from "./js/worker.js?worker";
    let $ = document.querySelector.bind(document);

    let worker;
    $("#convert-button").addEventListener("change", function(e){
        if (!worker) {
            worker = new MyWorker();
            worker.addEventListener("message", e => {
                if (e.data.type === "ready"){
                    const data = e.data.data;
                    const styles = e.data.styles;

                    $("#text1").value = JSON.stringify(data, null, 2);
                    $("#text2").value = JSON.stringify(styles, null, 2);
                }
            });
        }

        worker.postMessage({
            type: "convert",
            data: this.files[0]
        });
    });
    </script>
</body>
</html>