feat(templates): better web-component examples

- afterViewInit + scoped stype example
- autocompletion example

templates/basic/src/components/code-block.js

@@ -1,19 +1,38 @@
-class CodeBlockComponent extends HTMLElement {
+// @ts-check
-  connectedCallback() {
-    this.trimmed = this.innerHTML.trim();
-    const lang = this.getAttribute("language");
-    const lineNumbers = this.getAttribute("line-numbers") === "true";
 
-    console.log(lineNumbers, lang);
+/**
+ * Custom element using a minimal Web Component Base class
+ * @see https://ayco.io/n/web-component-base
+ */
+class CodeBlockComponent extends WebComponent {
+  // initialize props
+  language;
 
-    this.innerHTML = `
+  // tell browser which props to cause render
-      <div>
+  static properties = ["language"];
-        <pre class="language-${lang} ${
+
-      lineNumbers ? "line-numbers" : ""
+  // Triggered after view is initialized
-    }" id="pre" style="padding:1em;background:#efefef;margin:1em 0;border-radius:5px;overflow:scroll"><code id="code">${
+  afterViewInit() {
-      this.trimmed
+    /**
-    }</code></pre>
+     * Provides autocompletion on IDEs when @ts-check is enabled on first line
-      </div>
+     * @type {HTMLPreElement} */
+    const pre = this.querySelector("#pre");
+
+    // scoped style for pre block
+    pre.style.background = "#f5f2f0";
+    pre.style.padding = "1em";
+    pre.style.margin = "1em 0";
+    pre.style.fontSize = "1.25em";
+    pre.style.overflow = "auto";
+  }
+
+  // readonly template
+  get template() {
+    const trimmed = this.innerHTML.trim();
+    return `
+        <pre class="${
+          this.language && `language-${this.language}`
+        }" id="pre"><code id="code">${trimmed}</code></pre>
     `;
   }
 }

templates/basic/src/components/my-hello-world.js

@@ -3,15 +3,22 @@
  * @see https://ayco.io/n/web-component-base
  */
 class MyHelloWorld extends WebComponent {
+  // intialize props
+  dataName = 'World';
+
+  // tell browser which props to cause render
   static properties = ["data-name"];
 
+  // Triggered when the component is connected to the DOM
   onInit() {
     let count = 0;
+    // initialize event handler
     this.onclick = () => {
       this.setAttribute("data-name", `Clicked ${++count}x`);
     };
   }
 
+  // give readonly template
   get template() {
     /**
      * any attribute/property in kebab-case...

templates/basic/src/components/vanilla-hello-world.js

@@ -1,18 +0,0 @@
-class HelloWorld extends HTMLElement {
-  static get observedAttributes() {
-    return ["data-name"];
-  }
-
-  connectedCallback() {
-    let count = 0;
-    this.onclick = () => {
-      this.setAttribute("data-name", `Clicked ${++count}x`);
-    };
-  }
-
-  attributeChangedCallback(property, previousValue, currentValue) {
-    if (property === "data-name" && previousValue !== currentValue) {
-      this.innerHTML = `<button style="cursor:pointer">Hello ${currentValue}!</button>`;
-    }
-  }
-}

templates/basic/src/pages/index.html

@@ -22,10 +22,9 @@
       <h2>Welcome to {{ name }}</h2>
       <p>
         Here's a vanilla custom element:
-        <vanilla-hello-world data-name="{{name}}" />
+        <my-hello-world data-name="{{name}}" />
       </p>
       <code-block language="js">
-        <pre>
 class HelloWorld extends HTMLElement {
   static get observedAttributes() {
     return [&quot;data-name&quot;];
@@ -43,8 +42,7 @@ class HelloWorld extends HTMLElement {
       this.innerHTML = `&lt;button style=&quot;cursor:pointer&quot;&gt;Hello ${currentValue}!&lt;/button&gt;`;
     }
   }
-}</pre
+}
-        >
       </code-block>
     </main>
     <my-footer>