add random album feature

assets/js/random.js

@@ -0,0 +1,25 @@
+class GoRandomAlbum {
+  constructor () {
+    this.urls = window.albumsUrls
+    this.btn = document.querySelector('[data-random="btn"]')
+  }
+
+  init () {
+    this.bindEvents()
+  }
+
+  bindEvents () {
+    if (this.btn && this.urls) {
+      this.btn.addEventListener('click', () => {
+        this.getRandomUrl()
+      })
+    }
+  }
+
+  getRandomUrl() {
+    const index = Math.floor(Math.random()*(this.urls.length+1));
+    window.location.href = this.urls[index]
+  }
+}
+
+new GoRandomAlbum().init()

layouts/_default/baseof.html

@@ -48,6 +48,14 @@
 
     {{ partial "footer" . }}
 
+    <script>
+      window.albumsUrls = [
+        {{ range where .Site.RegularPages "Type" "in" "musics" }}
+          "{{ .Permalink}}",
+        {{ end }}
+      ]
+    </script>
+
     {{ $mobilemenu := resources.Get "js/menu.js" }}
     {{ $randomizer := resources.Get "js/random.js" }}
     {{ $js := slice $mobilemenu $randomizer | resources.Concat "js/bundle.js" }}