settings: Remove settings_org dependency from settings_list_widget.

Instead of taking a subsection option and calling the settings_org
function to update that subsection, we now take a callback function
as on_update. Also, we now store the value initial value of the
widget in opts.value instead of reading again from page_params.

These changes allow us to use this widget outside of settings_org
and for values other than settings that are in page_params.

static/js/settings_list_widget.js

@@ -2,9 +2,11 @@ const DropdownListWidget = function (opts) {
     opts = Object.assign({
         null_value: null,
         render_text: (item_name) => item_name,
+        on_update: () => {},
     }, opts);
     opts.container_id = `${opts.setting_name}_widget`;
     opts.value_id = `id_${opts.setting_name}`;
+    opts.value = opts.value || page_params[opts.setting_name];
 
     const render_dropdown_list = require("../templates/settings/dropdown_list.hbs");
 
@@ -30,7 +32,7 @@ const DropdownListWidget = function (opts) {
 
     const update = (value) => {
         render(value);
-        settings_org.save_discard_widget_status_handler($(`#org-${opts.subsection}`));
+        opts.on_update(value);
     };
 
     const register_event_handlers = () => {
@@ -96,7 +98,7 @@ const DropdownListWidget = function (opts) {
             dropdown_toggle.trigger(custom_event);
         });
 
-        render(page_params[opts.setting_name]);
+        render(opts.value);
         register_event_handlers();
     };
 

static/js/settings_org.js

@@ -549,7 +549,9 @@ exports.init_dropdown_widgets = () => {
             };
             return item;
         }),
-        subsection: 'notifications',
+        on_update: () => {
+            exports.save_discard_widget_status_handler($(`#org-notifications`));
+        },
         default_text: i18n.t("Disabled"),
         render_text: (x) => {return `#${x}`;},
         null_value: -1,
@@ -568,7 +570,9 @@ exports.init_dropdown_widgets = () => {
                 value: x,
             };
         }),
-        subsection: 'other-settings',
+        on_update: () => {
+            exports.save_discard_widget_status_handler($(`#org-other-settings`));
+        },
         default_text: i18n.t("No language set"),
     });
 };