add missing checks for already initialized js utils in form.js

static/js/utils/form.js

@@ -270,6 +270,10 @@
       throw new Error('Auto Submit Button utility needs to be passed an element!');
     }
 
+    if (element.classList.contains(AUTO_SUBMIT_BUTTON_INITIALIZED_CLASS)) {
+      return false;
+    }
+
     // hide and mark initialized
     element.classList.add(AUTO_SUBMIT_BUTTON_HIDDEN_CLASS, AUTO_SUBMIT_BUTTON_INITIALIZED_CLASS);
 
@@ -315,6 +319,10 @@
         throw new Error('Auto Submit Input utility needs to be passed an element!');
       }
 
+      if (element.classList.contains(AUTO_SUBMIT_INPUT_INITIALIZED_CLASS)) {
+        return false;
+      }
+
       form = element.form;
       if (!form) {
         throw new Error('Could not determine associated form for auto submit input');
@@ -374,6 +382,10 @@
         throw new Error('Form Error Remover utility needs to be passed an element!');
       }
 
+      if (element.classList.contains(FORM_ERROR_REMOVER_INITIALIZED_CLASS)) {
+        return false;
+      }
+
       // find form groups
       formGroups = Array.from(element.querySelectorAll(FORM_GROUP_SELECTOR));
 
@@ -428,6 +440,8 @@
   var DATEPICKER_UTIL_NAME = 'datepicker';
   var DATEPICKER_UTIL_SELECTOR = 'input[type="date"], input[type="time"], input[type="datetime-local"]';
 
+  var DATEPICKER_INITIALIZED_CLASS = 'datepicker--initialized';
+
   var DATEPICKER_CONFIG = {
     "datetime-local": {
       enableTime: true,
@@ -459,6 +473,10 @@
         throw new Error('Datepicker utility needs to be passed an element!');
       }
 
+      if (element.classList.contains(DATEPICKER_INITIALIZED_CLASS)) {
+        return false;
+      }
+
       var flatpickrConfig = DATEPICKER_CONFIG[element.getAttribute("type")];
 
       if (!flatpickrConfig) {
@@ -467,6 +485,9 @@
 
       flatpickrInstance = flatpickr(element, flatpickrConfig);
 
+      // mark initialized
+      element.classList.add(DATEPICKER_INITIALIZED_CLASS);
+
       return {
         name: DATEPICKER_UTIL_NAME,
         element: element,