erp5_web_renderjs_ui: Give options to declareGadgetKlass to customise the creating gadget

For now the parameter is intended to pass optional javascript files to customise
the defined javascript behavior which is defined in gadget html.

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_renderjs_js.js

@@ -1636,7 +1636,7 @@ if (typeof document.contains !== 'function') {
 
   function privateDeclarePublicGadget(url, options, parent_gadget,
                                       old_element) {
-    var klass = renderJS.declareGadgetKlass(url);
+    var klass = renderJS.declareGadgetKlass(url, options);
     // gadget loading should not be interrupted
     // if not, gadget's definition will not be complete
     //.then will return another promise
@@ -1881,6 +1881,7 @@ if (typeof document.contains !== 'function') {
         // Clean up the element content
         // Remove all existing event listener
         options.element = old_element.cloneNode(false);
+      } else if (options.js_list === '') {
       } else {
         throw new Error('No need to manually provide a DOM element ' +
                         'without a parentNode: ' + url);
@@ -2118,7 +2119,7 @@ if (typeof document.contains !== 'function') {
     return tmp_constructor;
   }
 
-  renderJS.declareGadgetKlass = function declareGadgetKlass(url) {
+  renderJS.declareGadgetKlass = function declareGadgetKlass(url, options) {
     var tmp_constructor,
       defer;
 
@@ -2152,7 +2153,8 @@ if (typeof document.contains !== 'function') {
           promise_list = [],
           i,
           js_list = tmp_constructor.prototype.__required_js_list,
-          css_list = tmp_constructor.prototype.__required_css_list;
+          css_list = tmp_constructor.prototype.__required_css_list,
+          options_js_list = options.js_list;
         // Load JS
         if (js_list.length) {
           gadget_loading_klass_list.push(tmp_constructor);
@@ -2161,6 +2163,12 @@ if (typeof document.contains !== 'function') {
           }
           promise_list.push(renderJS.declareJS(js_list[i], fragment, true));
         }
+        if (options_js_list != undefined && options_js_list.length) {
+          for (i = 0; i < options_js_list.length - 1; i += 1) {
+            promise_list.push(renderJS.declareJS(options_js_list[i], fragment));
+          }
+          promise_list.push(renderJS.declareJS(options_js_list[i], fragment, true));
+        }
         // Load CSS
         for (i = 0; i < css_list.length; i += 1) {
           promise_list.push(renderJS.declareCSS(css_list[i], fragment));