Implemented filtering for mindflow categories.

homepage/static/assets/js/mindflow.js

@@ -0,0 +1,16 @@
+const categories = ["update", "diary"];
+
+const buttons = document.getElementsByTagName("button");
+const articles = document.getElementsByTagName("article");
+
+document.getElementById("filter").classList.remove("hidden");
+
+for (let i = 0; i < buttons.length; ++i)
+    if (buttons[i].hasAttribute("name"))
+        buttons[i].addEventListener("click", e => {
+            const category = e.target.name;
+            for (let j = 0; j < articles.length; ++j)
+                if (articles[j].id.startsWith(category) || category === "all")
+                    articles[j].classList.remove("hidden");
+                else
+                    articles[j].classList.add("hidden"); });