@trailstash/ultra/components/map-popup.js

A web based tool for making MapLibre GL maps with data from sources such as Overpass, GeoJSON, GPX, KML, TCX, etc

import DOMPurify from "dompurify";
import { Liquid } from "liquidjs";
import { h, t } from "../lib/dom.js";
import { normalizeCSS } from "../lib/normalize.js";

const engine = new Liquid();

const style = new CSSStyleSheet();
style.replaceSync(`
  a {
    text-decoration: none;
  }
  h1,h2,h3,h4,h5,h6 {
    margin: .5em 0;
  }
`);

const defaultTemplate = `
  <h3>Properties</h3>
  {%- for prop in properties %}
    <code>{{ prop[0] }} = {{ prop[1] | json }}</code>
    <br>
  {%- endfor %}
`;

const defaultContextBuilder = ({ properties, geometry }) => {
  const context = { properties: structuredClone(properties) };
  if (geometry.type === "Point") context.geometry = geometry;
  return context;
};

export class MapPopup extends HTMLElement {
  constructor() {
    super();
    this.template = defaultTemplate;
    this.contextBuilder = defaultContextBuilder;
  }

  connectedCallback() {
    const shadow = this.attachShadow({ mode: "open" });

    shadow.adoptedStyleSheets.push(normalizeCSS);
    shadow.adoptedStyleSheets.push(style);

    const div = h("div");
    div.style.maxHeight = "1000px";
    div.style.overflowY = "auto";
    let first = true;
    for (const f of Object.values(this.features)) {
      if (first) {
        first = false;
      } else {
        div.appendChild(h("hr"));
      }
      const html = engine.parseAndRenderSync(
        this.template,
        this.contextBuilder(f),
      );
      div.appendChild(
        h(
          "div",
          {},
          DOMPurify.sanitize(html, {
            ALLOWED_URI_REGEXP:
              /^(?:(?:(?:f|ht)tps?|mailto|tel|callto|sms|cid|xmpp|geo):|[^a-z]|[a-z+.\-]+(?:[^a-z+.\-:]|$))/i,
          }),
        ),
      );
    }
    shadow.appendChild(div);
  }
}