Repeated clicks on the same hash link work

Also divorced some internal logic for the $scroll plugin.

Related to Issues #31, #32

components/element/Link.vue

@@ -11,7 +11,8 @@ to type it absolutely everywhere.
 -->
 
 <template>
-  <NuxtLink :to="path" :class="isActive">
+  <!-- XXX @click.native will stop working in Vue v3+ (Vue Router v4+), but @click should start working -->
+  <NuxtLink :to="path" :class="isActive" @click.native="navigate">
     <slot />
   </NuxtLink>
 </template>
@@ -40,5 +41,16 @@ export default Vue.extend({
       return this.to.startsWith('#');
     },
   },
+  methods: {
+    /**
+     * Works around a bug in Vue where anchor links don't work repeatedly.
+     * This feature normally works in browsers, so people exepct it to work.
+     */
+    navigate(): void {
+      if (this.isHash && this.path === this.$route.hash) {
+        this.$scroll.toHash(this.path);
+      }
+    },
+  },
 });
 </script>

layouts/default.vue

@@ -18,11 +18,11 @@ export default Vue.extend({
   },
   watch: {
     $route(): void {
-      this.$scroll(this.$route);
+      this.$scroll.onNavigation(this.$route);
     },
   },
   mounted(): void {
-    this.$scroll(this.$route);
+    this.$scroll.onNavigation(this.$route);
     // Provide calls to this.$gtag here to update Analytics
   },
 });

plugins/scroll.client.ts

@@ -1,12 +1,6 @@
 import { Plugin } from '@nuxt/types';
 import { Route } from 'vue-router';
 
-declare module 'vue/types/vue' {
-  interface Vue {
-    $scroll($route: Route): void;
-  }
-}
-
 /**
  * How does this work? A good question. It may be buggy.
  *
@@ -26,23 +20,45 @@ declare module 'vue/types/vue' {
  * in the layout for the pages. If it's broken, first confirm your page's
  * layout does call this.$scroll() inside of watch on $route.
  */
-const scrollPlugin: Plugin = (_, inject) => {
-  let historyKeyMax = 0;
 
-  inject('scroll', ($route: Route): void => {
+const scroll = {
+  /**
+   * To be called on navigation
+   */
+  onNavigation($route: Route): void {
     const historyKey = +history.state.key;
-    if (historyKeyMax < historyKey) {
-      historyKeyMax = historyKey;
+    if (this._historyKeyMax < historyKey) {
+      this._historyKeyMax = historyKey;
       if (!$route.hash) {
         globalThis.scrollTo(0, 0);
       } else {
         // Take over the browser's usual job of scrolling, because some won't
-        const target = globalThis.document.getElementById($route.hash.slice(1));
-        const boundingClientRect = target?.getBoundingClientRect();
-        globalThis.scrollBy(0, boundingClientRect?.y ?? 0);
+        this.toHash($route.hash);
       }
     }
-  });
+  },
+  /**
+   * Moves to a given hash on a page if it exists. Can be given without or without a # sign
+   */
+  toHash(hash: string): void {
+    if (hash.startsWith('#')) {
+      hash = hash.slice(1);
+    }
+    const target = globalThis.document.getElementById(hash);
+    const boundingClientRect = target?.getBoundingClientRect();
+    globalThis.scrollBy(0, boundingClientRect?.y ?? 0);
+  },
+  _historyKeyMax: 0,
 };
 
+const scrollPlugin: Plugin = (_, inject) => {
+  inject('scroll', scroll);
+};
+
+declare module 'vue/types/vue' {
+  interface Vue {
+    $scroll: typeof scroll;
+  }
+}
+
 export default scrollPlugin;