add button!

ui/static/ui/button.js

@@ -0,0 +1,35 @@
+function getCookie(name) {
+    var cookieValue = null;
+    if (document.cookie && document.cookie !== '') {
+        var cookies = document.cookie.split(';');
+        for (var i = 0; i < cookies.length; i++) {
+            var cookie = cookies[i].trim();
+            // Does this cookie string begin with the name we want?
+            if (cookie.substring(0, name.length + 1) === (name + '=')) {
+                cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
+                break;
+            }
+        }
+    }
+    return cookieValue;
+}
+
+var csrftoken = getCookie('csrftoken');
+var button = document.getElementById("BUTTON");
+var count = document.getElementById("COUNT");
+
+button.addEventListener("click", event => {
+    fetch('/button', {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json',
+            'X-CSRFToken': csrftoken
+        }
+    })
+        .then((response) => {
+            return response.json();
+        })
+        .then((data) => {
+            count.innerText = data.pressed;
+        });
+})