remove validation from dropdown with no options

(so can all be injected)

Author: Dave Conway-Jones

CHANGELOG.md

@@ -3,6 +3,7 @@
 
 **Enhancements**
 
+ - Allow Tabs to be hidden or disabled dynamically from a ui_control msg.
  - Finally remove deprecated second output from ui_chart node.
  - Allow ui_form to be submitted with empty fields (if they are not required)
 
@@ -12,6 +13,8 @@
  - Add startsWith polyfill for IE11
  - Ensure active sidebar menu item is highlighted - Issue #472
  - Sanitise display of html input - Issue #473
+ - Respect msg.socketid to return msg back to selected session.
+ - Allow dropdown to have 0 pre-configured values, by removing validation.
 
 ### 2.13.2: Maintenance Release
 

README.md

@@ -111,7 +111,8 @@ for futher details.
   - **Template** - the template node allows the user to specify and create their own widgets within the framework using HTML, Javascript. This is an Angular.js widget. You may also use this to override the built in CSS styles.
   - **Text** - A read only widget, the layout of the `label`, and `value` can be configured.
   - **Text input** - text input box, with optional label, can also support password, email and colour modes.
-  - **UI-Control** - allows some dynamic control of the dashboard. Sending a `msg.payload` of the tab number (from 0) or tab_name will switch to that tab. Groups can be hidden and made visible via a msg like `{"group":{"hide":["tab_name_group_name_with_underscores"],"show":["tab_name_another_group"],"focus":true}}`. Outputs a `msg.payload` for every browser *connect* and *loss* and every tab *change*  that can be used to trigger other actions.
+  - **UI-Control** - allows some dynamic control of the dashboard. Sending a `msg.payload` of the tab number (from 0) or tab_name will switch to that tab. Tabs can be enabled/disabled/hide/show via msg like `{"tabs":{"hide":["tab_name_with_underscores"],"show":["another_tab_name"],"disable":["unused_tab_name"]}}`.
+  Groups can be hidden and made visible via a msg like `{"group":{"hide":["tab_name_group_name_with_underscores"],"show":["tab_name_another_group"],"focus":true}}`. Outputs a `msg.payload` for every browser *connect* and *loss*, and every tab *change*. This can be used to trigger other actions like resetting the visibility of tabs and groups.
 
 **Tip:** The *Text* widget will accept html - so you can use it together with the *fa-icons* we
 already use to create indicator type widgets.

nodes/ui_dropdown.html

@@ -20,7 +20,7 @@
             },
             height: {value: 0},
             passthru: {value: true},
-            options: {value:[{value: '', label : ''}], validate:function(value) { return value.length > 0; }},
+            options: {value:[{value: '', label : ''}]},
             payload: {value: ''},
             topic: {value: ''}
         },