delete entries in statistic

app/public/js/edit_table.js

@@ -16,6 +16,7 @@ function init() {
     team_edit_button();
     team_delete_button();
     station_delete_button();
+    statistic_delete_button();
 }
 
 var selected = null;
@@ -124,4 +125,18 @@ function station_delete_button() {
             }
         }
     }
+}
+
+function statistic_delete_button() {
+    var button = document.getElementById('delete_statistic');
+    if(button != null) {
+        button.onclick = function() {
+            var row = document.getElementsByClassName('row selected')[0];
+            document.getElementById('m_id_delete').value = row.id;
+            let confirmAction = confirm("Wirklich löschen?");
+            if (confirmAction) {
+                this.form.submit();
+            }
+        }
+    }
 }