回答編集履歴
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たとえば
test
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おそらく、`addElevation`関数で`coordinates`配列に非同期に追加している要素を待ち切れていないのだと思います。どこかで`Promise`を受け取るなどをするしかなさそうですね。
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### たとえば
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```html
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<!DOCTYPE html>
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<html lang="ja">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width,initial-scale=1.0, ,user-scalable=no">
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</head>
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<body>
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<button class="work" onclick="exportGPX()">
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<i class="fa-solid fa-print">exportGPX</i>
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</button>
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<script type="text/javascript" src="https://maps.gsi.go.jp/js.lib/leaflet-1.2.0/leaflet.js"></script>
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<script type="text/javascript" src="https://maps.gsi.go.jp/js.lib/jquery/jquery-1.11.1.min.js"></script>
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<script>
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var track = {
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"type": "FeatureCollection",
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"features": [
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{
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"type": "Feature",
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"properties": {
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"id": "waypoints",
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"names": "|"
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},
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"geometry": {
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"type": "MultiPoint",
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"coordinates": [[140.834125, 38.310143], [140.860454, 38.222667]]
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}
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},
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{
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"type": "Feature",
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"properties": {
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"id": "line"
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},
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"geometry": {
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"type": "LineString",
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"coordinates": [
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[140.83413, 38.31014], [140.83424, 38.30989], [140.86038, 38.22176], [140.86069, 38.22186], [140.86045, 38.22267], [140.86045, 38.22267]
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]
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}
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}]
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}
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var outputGPXstyle = '<?xml version="1.0" encoding="UTF-8"?>'
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'<gpx xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/0" version="1.1" author="signpost - https://signpost.mydns.jp/">'
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'<metadata>'
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'<trk>'
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'<name>trackName'
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'<desc>'
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'<trkseg>'
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'<trkpt lat="38.31014" lon="140.83413"><ele>標高値'
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'<trkpt lat="38.30989" lon="140.83424"><ele>標高値'
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'............'
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'<trkpt lat="38.22267" lon="140.86045"><ele>標高値'
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''
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''
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//----------------------------------------------------------------------------
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function addElevation(track) {
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// Elevation add >>>>>>>>>>>>>>>>>>>>>>
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return Promise.all(track.features
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.filter(function (feature) { return feature.geometry.type == "LineString" })
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.map(function (feature) {
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let coordinates = feature.geometry.coordinates;
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return Promise.all(coordinates.map(function (coordinate, i) {
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lat = coordinate[1];
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lng = coordinate[0];
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//console.log(lat + ',' + lng);
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// 地理院地図サーバから標高を求める
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// http://maps.gsi.go.jp/development/elevation_s.html
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// https://2ndart.hatenablog.com/entry/2021/04/29/143307
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var src = 'https://cyberjapandata2.gsi.go.jp/general/dem/scripts/getelevation.php?lon=' + lng + '&lat=' + lat;
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return fetch(src)
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.then((response) => {
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return response.text();
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})
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.then((text) => {
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var results = JSON.parse(text);
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// Math.round() 関数は、引数として与えた数を四捨五入
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var popStr = Math.round(results.elevation);
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///console.log(popStr);
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coordinates[i].push(popStr);
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})
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}))
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}))
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};
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//----------------------------------------------------------------------------
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function exportGPX() {
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let outputGpxText;
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let sp2 = ' ';
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addElevation(track).then(function () {
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// routeline >>>>>
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// https://stackoverflow.com/questions/51397890/how-to-use-polyline-decorator-in-leaflet-using-geojson-line-string
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track.features
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.filter(function (feature) { return feature.geometry.type == "LineString" })
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.map(function (feature) {
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let textGpx = '<?xml version="1.0" encoding="UTF-8"?>' + '\n' +
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'<gpx xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/0" version="1.1" author="signpost - https://signpost.mydns.jp/">' + '\n' +
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'<metadata>' + '\n' +
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'<trk>' + '\n' +
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'<name>' + 'trackName' + '' + '\n' +
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'<desc>' + '\n' +
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'<trkseg>' + '\n';
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//------kokokara----
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let coordinates = feature.geometry.coordinates;
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console.log(coordinates); //<<<<<<< [1]ここでは3要素有る
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coordinates[2].push('tuikasita');
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coordinates.forEach(function (coordinate, i) {
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textGpx = textGpx + sp2 + '<trkpt lat="' + coordinate[1] + '" lon="' + coordinate[0] + '">';
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console.log(coordinate[0] + ' ' + coordinate[1] + ' ' + coordinate[2]);
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// >>>>>>>>>>>>[2] ここでは3要素がundefinedになる
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// データに標高が無い場合
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if (coordinate.length == 2) {
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textGpx = textGpx + '<ele>';
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// データに標高が有る場合
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} else if (coordinate.length == 3) {
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textGpx = textGpx + '<ele>' + coordinate[2] + '';
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}
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textGpx = textGpx + '' + '\n';
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})
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textGpx = textGpx + '' + '\n' + ''
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console.log(textGpx);
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let outputGPXstyle = textGpx;
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})
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// Code Export >>>>>
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/* https://qiita.com/kerupani129/items/99fd7a768538fcd33420
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※ [0].click():jQuery オブジェクトの [0] は HTMLElement オブジェクト。HTMLElement.click() を呼んでいる
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https://www.sejuku.net/blog/67735
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----------------------------------------------*/
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/*$('<a>', {
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href: window.URL.createObjectURL(new Blob([outputGPXstyle], {type : 'text/plain'})),
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download: 'fileName' + '.gpx'
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})[0].click(); // ※ [0].click()*/
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})
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};
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</script>
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</body>
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</html>
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```
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