andrewgryan · andrewgryan · Oct 30, 2024 · Oct 25, 2024 · Oct 25, 2024 · Oct 30, 2024
diff --git a/src/index.js b/src/index.js
@@ -7,6 +7,7 @@ import LMarker from "./l-marker.js";
 import LOverlayLayers from "./l-overlay-layers.js";
 import LPopup from "./l-popup.js";
 import LTileLayer from "./l-tile-layer.js";
+import LTileLayerWMS from "./l-tile-layer-wms.js";
 import LLatLngBounds from "./l-lat-lng-bounds.js";
 import LImageOverlay from "./l-image-overlay.js";
 import LVideoOverlay from "./l-video-overlay.js";
@@ -28,6 +29,7 @@ const init = (() => {
   customElements.define("l-overlay-layers", LOverlayLayers);
   customElements.define("l-layer-group", LLayerGroup);
   customElements.define("l-tile-layer", LTileLayer);
+  customElements.define("l-tile-layer-wms", LTileLayerWMS);
   customElements.define("l-marker-cluster-group", LMarkerClusterGroup);
   customElements.define("l-marker", LMarker);
   customElements.define("l-popup", LPopup);

diff --git a/src/l-tile-layer-wms.js b/src/l-tile-layer-wms.js
@@ -0,0 +1,60 @@
+// @ts-check
+import { tileLayer } from "leaflet";
+import LLayer from "./l-layer.js";
+import { layerConnected } from "./events.js";
+import { htmlAttribute, optional, parse, partial } from "./parse.js";
+
+class LTileLayerWMS extends LLayer {
+  constructor() {
+    super();
+    this.layer = null;
+  }
+
+  connectedCallback() {
+    const urlTemplate = parse(htmlAttribute("url-template"), this);
+
+    const name = this.getAttribute("name");
+    const schema = partial({
+      // Leaflet.tileLayer default options: https://leafletjs.com/reference.html#tilelayer-wms-layers
+      layers: htmlAttribute("layers"),
+      styles: optional(htmlAttribute("styles")),
+      format: optional(htmlAttribute("format")),
+      transparent: optional(htmlAttribute("transparent")),
+      version: optional(htmlAttribute("version")),
+      crs: optional(htmlAttribute("crs")),
+      uppercase: optional(htmlAttribute("uppercase")),
+
+      // Inherited option from Layer: https://leafletjs.com/reference.html#tilelayer-wms-attribution
+      attribution: optional(htmlAttribute("attribution")),
+    });
+
+    const standardOptions = parse(schema, this);
+    const nonStandardOptionsElement = this.getAttribute("options");
+    const nonStandardOptions = () => {
+      if (nonStandardOptionsElement) {
+        try {
+          return JSON.parse(nonStandardOptionsElement);
+        } catch (e) {
+          console.error(
+            "Error whilst parsing JSON for options attribute in l-tile-layer-wms",
+            e,
+          );
+          return {};
+        }
+      } else {
+        return {};
+      }
+    };
+
+    this.layer = tileLayer.wms(urlTemplate, {
+      ...standardOptions,
+      ...nonStandardOptions(),
+    });
+    const event = new CustomEvent(layerConnected, {
+      detail: { name, layer: this.layer },
+      bubbles: true,
+    });
+    this.dispatchEvent(event);
+  }
+}
+export default LTileLayerWMS;
diff --git a/src/l-tile-layer-wms.test.js b/src/l-tile-layer-wms.test.js
@@ -0,0 +1,93 @@
+// @vitest-environment happy-dom
+import { tileLayer } from "leaflet";
+import { it, expect } from "vitest";
+import { layerConnected } from "./events";
+import "./index";
+
+it("should create an l-tile-layer-wms with the correct options", async () => {
+  const urlTemplate = "http://ows.mundialis.de/services/service?";
+  const el = document.createElement("l-tile-layer-wms");
+  el.setAttribute("url-template", urlTemplate);
+  el.setAttribute("layers", "example-wms-layer");
+
+  let promise = new Promise((resolve) => {
+    el.addEventListener(layerConnected, (ev) => {
+      resolve(ev.detail);
+    });
+  });
+  document.body.appendChild(el);
+
+  const actual = await promise;
+  const expected = {
+    name: null,
+    layer: tileLayer.wms(urlTemplate, { layers: "example-wms-layer" }),
+  };
+  expect(actual).toEqual(expected);
+});
+
+it.each([
+  ["http://example.com/wms", "styles", "default"],
+  ["http://example.com/wms", "format", "image/png"],
+  ["http://example.com/wms", "transparent", "true"],
+])("should handle WMS options %s %s", (urlTemplate, key, value) => {
+  const el = document.createElement("l-tile-layer-wms");
+  el.setAttribute("url-template", urlTemplate);
+  el.setAttribute("layers", "example layer ere");
+  el.setAttribute(key, value);
+  document.body.appendChild(el);
+
+  const actual = el.layer;
+  const expected = tileLayer.wms(urlTemplate, {
+    layers: "example layer ere",
+    [key]: value,
+  });
+  expect(actual).toEqual(expected);
+});
+
+it("should support attribution", () => {
+  const urlTemplate = "http://example.com/wms";
+  const attribution = "&copy; OpenStreetMap contributors";
+  const layers = "example-wms-layer";
+  const el = document.createElement("l-tile-layer-wms");
+  el.setAttribute("url-template", urlTemplate);
+  el.setAttribute("attribution", attribution);
+  el.setAttribute("layers", layers);
+  document.body.appendChild(el);
+
+  const actual = el.layer;
+  const expected = tileLayer.wms(urlTemplate, { attribution, layers });
+  expect(actual).toEqual(expected);
+});
+
+it("should parse valid JSON in the options attribute", () => {
+  const urlTemplate = "http://example.com/wms";
+  const options = '{"height": 101, "bbox": "coords ere"}';
+  const el = document.createElement("l-tile-layer-wms");
+  el.setAttribute("url-template", urlTemplate);
+  el.setAttribute("layers", "example layer ere");
+  el.setAttribute("options", options);
+  document.body.appendChild(el);
+
+  const actual = el.layer;
+  const expected = tileLayer.wms(urlTemplate, {
+    layers: "example layer ere",
+    height: 101,
+    bbox: "coords ere",
+  });
+  expect(actual).toEqual(expected);
+});
+
+it("should handle invalid JSON in the options attribute gracefully", () => {
+  const urlTemplate = "http://example.com/wms";
+  const invalidJson = '{"height": 10, "bbox": "coords ere"'; // <- missing closing brace
+  const el = document.createElement("l-tile-layer-wms");
+  el.setAttribute("url-template", urlTemplate);
+  el.setAttribute("layers", "example layer ere");
+  el.setAttribute("options", invalidJson);
+  document.body.appendChild(el);
+
+  // Expect layer creation to succeed but without additional options
+  const actual = el.layer;
+  const expected = tileLayer.wms(urlTemplate, { layers: "example layer ere" });
+  expect(actual).toEqual(expected);
+});