opera.contexts.menu.onclick and MenuItem.onclick

This functionality has not landed in a stable Opera version yet, but you can use it already in Opera Next.

Description

This property represents the function executed when a context menu item is clicked. This callback function will contain one argument of type MenuEvent.

Example:

The below example opens a new tab when the extension's menu item is clicked.

<!-- 
  The configuration file ('config.xml').
-->
<?xml version='1.0' encoding='utf-8'?>
<widget xmlns="http://www.w3.org/ns/widgets">
    ...
    <feature name="opera:contextmenus"/>
    ...
</widget>

//
// The background process (e.g. index.html)
//

if (opera.contexts.menu) {
  var menu = opera.contexts.menu;
  
  // Create a menu item properties object
  var itemProps = {
    title: 'Context Menu Example',
    type: 'folder'
  }

  // Create a menu item with the specified properties
  var item = menu.createItem(itemProps);
  // Add the menu item to the context menu
  menu.addItem(item);
  
  // Open a new tab when clicked
  item.onclick = function(event) {
    var tab = opera.extension.tabs.create();
  };
}