maps.chandlerswift.com/main.js

import './style.css';
import {Map, View} from 'ol';
import {fromLonLat, get} from 'ol/proj.js';
import {defaults as defaultControls} from 'ol/control.js';

import ToggleMenuControl from './ui/controls.js';

import layerCategories from './layers/index.js';

const map = new Map({
  controls: defaultControls().extend([new ToggleMenuControl()]),
  target: 'map',
  layers: [],
  view: new View({
    center: fromLonLat([-93.24151, 44.80376]),
    zoom: 10,
  })
});

// Basic reactivity binding: like vue.js, just worse :)
//
// This implements some basic reactivity so that I can add and remove layers.
// Nothing too fancy, at this point. Eventually, I'll likely pull in proper Vue,
// as I aim for more complex interactions, like layer ordering, color selection,
// custom layer imports, and more.
for (let category of layerCategories) {
  const catDiv = document.createElement("div");
  catDiv.innerHTML = `
    <details ${category.layers.filter(l => l.enabled).length > 0 ? "open" : ""}>
    <summary>${category.name}</summary>
    <ul></ul>
    </details>
  `;
  for (let layer of category.layers) {
    const li = document.createElement("li");
    li.innerHTML = `
      <label><input type="checkbox" ${layer.enabled ? "checked" : ""}> ${layer.name}</label>
    `;
    li.querySelector("input").addEventListener("change", function(e){
      if (e.target.checked) {
        map.getLayers().push(layer.layer);
      } else {
        map.getLayers().remove(layer.layer);
      }
    });
    catDiv.querySelector("ul").appendChild(li);
  }
  document.querySelector("aside").appendChild(catDiv);
}

for (let category of layerCategories) {
  for (let layer of category.layers) {
    if (layer.enabled) {
      map.addLayer(layer.layer);
    }
  }
}