began new circumstances in JS

static/js/find_circumstances.js

@@ -0,0 +1,17 @@
+function showHideFindCircumstancesNew() {
+    let circField = document.getElementById("id_find_circumstances");
+    let circFieldNew = document.getElementById("id_find_circumstances_new");
+    let circText = circField.options[circField.selectedIndex].text;
+
+    if (circText == 'Neu') {
+        circFieldNew.type = "show"
+    } else {
+        circFieldNew.type = "hidden"
+    }
+}
+
+(showHideFindCircumstancesNew)();
+
+document.getElementById("id_find_circumstances").addEventListener("change", (event) => {
+    showHideFindCircumstancesNew()
+});