質問編集履歴
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webページの作成等は今まで一切触れた事がなく，通常のアプリケーションの感覚で作ってみたら動かなくて困惑しています．
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どのように調べたら解決策が出てくるかもまるで検討がつきません．これ以降さらにapiを活用してmap上のポイントを追加したり，削除したりするより動的な処理をさせようとしているので初歩でつまづいて困っています．こういった場合の対処法，技術，調べ方，方針等webアプリケーション制作に詳しい方にアドバイスいただけると幸いです．
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[追記]
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一応文中にサンプルのjavascript内のマップロード前にapi叩いただけだと書きましたが，どうやらわかりづらかったようなのでコードを貼っておきます．見ての通りただ本当にapiの処理を入れただけです．
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```WebMapPoint.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>GeoJSONポイントの描画</title>
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<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
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<link href="https://api.mapbox.com/mapbox-gl-js/v2.4.0/mapbox-gl.css" rel="stylesheet">
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<script src="https://api.mapbox.com/mapbox-gl-js/v2.4.0/mapbox-gl.js"></script>
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<style>
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body { margin: 0; padding: 0; }
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#map { position: absolute; top: 0; bottom: 0; width: 100%; }
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</style>
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</head>
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<body>
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<div id="map"></div>
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<script src="MapLoad.js" charset="UTF-8">
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</script>
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</body>
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</html>
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```
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```MapLoad.js
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//ここのコメントアウトを外してapiへのアクセスを試みると動かなくなる．
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/*
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let apiURL = "http://localhost:7071/api/mapPoint";//apiのURL
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//apiリクエストの作成
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var request = new XMLHttpRequest();
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request.open("GET", apiURL, true);
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request.responseType = "json";
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//apiからPOINT情報をGETで全て取得する
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request.onload = function () {
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var data = this.response;
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}
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request.send();
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var jsondata = [
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{
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"type": "geojson",
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"data": data
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}
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]
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*/
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// TO MAKE THE MAP APPEAR YOU MUST
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// ADD YOUR ACCESS TOKEN FROM
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// https://account.mapbox.com
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mapboxgl.accessToken = "<トークン>";
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const map = new mapboxgl.Map({
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container: "map",
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style: "mapbox://styles/mapbox/light-v10",
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center: [-96, 37.8],
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zoom: 2
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});
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//let jsonObject=JSON.stringify(jsondata);
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map.on("load", () => {
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// Add an image to use as a custom marker
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map.loadImage(
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"https://docs.mapbox.com/mapbox-gl-js/assets/custom_marker.png",
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(error, image) => {
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if (error) throw error;
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map.addImage("custom-marker", image);
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// Add a GeoJSON source with 2 points
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map.addSource("points",
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{
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"type": "geojson",
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"data": {
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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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"geometry": {
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"type": "Point",
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"coordinates": [36.28649301434915, -112.09412822905652]
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},
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"properties": {
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"id": 1,
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"name": "Grand Canyon National Park",
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"address": "Arizona, United States",
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"phone": "+19286387888",
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"url": "http://www.nps.gov/grca/"
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}
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}
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]
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}
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});
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// Add a symbol layer
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map.addLayer({
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"id": "points",
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"type": "symbol",
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"source": "points",
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"layout": {
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"icon-image": "custom-marker",
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// get the title name from the source"s "title" property
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"text-field": ["get", "name"],
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"text-font": [
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"Open Sans Semibold",
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"Arial Unicode MS Bold"
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],
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"text-offset": [0, 1.25],
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"text-anchor": "top"
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}
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});
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}
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);
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});
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```
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