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                <div class="file">
  <label>RWGのGPX: <input type="file" accept=".gpx"></label>
<div class="setting">
  <label>出力ポイント数: <input type="number" value="0"></label>
  <label>出力するファイル名: <input type="text" value="" class="fileName"></label>
  <label>出力するトラック名: <input type="text" value="" class="truckName"></label>
<div class="download"></div>



                label {
  display: block;

.setting {
  display: none;
  margin: 1em 0 0;
  border-top: solid #ccc 1px;
  padding: 1em 0 0;

.download {
  display: none;
  margin: 1em 0 0;
  border-top: solid #ccc 1px;
  padding: 1em 0 0;



const setting = document.querySelector('.setting');
const download = document.querySelector('.download');
const inputFile = document.querySelector('input[type=file]');
const inputPoints = document.querySelector('input[type=number]');
const inputFileName = document.querySelector('.fileName');
const inputTruckName = document.querySelector('.truckName');
const button = document.querySelector('button');

const setFile = (event) => {
  setting.setAttribute('style','display: none;');
  download.setAttribute('style','display: none;');
  const fileObject =[0];
  const temporaryFullName =;
  const temporaryName = temporaryFullName.split('.')[0];
  inputFileName.value = temporaryName + '_converted';

  const rwgGpx = new FileReader();
  rwgGpx.addEventListener('load', (event) => loadedFile(event));
inputFile.addEventListener('change', (event) => setFile(event));

const loadedFile = (event) => {
  const loadedGpx =;

  const parser = new DOMParser();
  const temporaryGpx = parser.parseFromString(loadedGpx, 'application/xml');

  setting.setAttribute('style','display: block;');

  button.addEventListener('click', (event) => generateNewFile(event, temporaryGpx));

const generateNewFile = (event, temporaryGpx) => {
  const outputGpx = new XMLSerializer();
  let outputGpxText = outputGpx.serializeToString(temporaryGpx);

  const blob = new Blob([outputGpxText], {type: 'application/xml'});

  while(download.firstElementChild) {

  const a = document.createElement('a');
  a.href = window.URL.createObjectURL(blob);
  a.textContent = 'ダウンロード'; = 'convert.gpx';


  download.setAttribute('style','display: block;');