By Opera Software

From Opera 15 onward, Opera 11 & 12’s extension format is no longer supported, and instead, we’ve switched to Chromium’s extension model. Check out our new documentation for developing extensions for Opera 15 and higher and start building your own extensions.


The selectionText attribute is the run of text selected by the user. If the user has not selected any text then this attribute will be null.


readonly DOMString selectionText


In this example, a menu item is added to the context menu only when the user selects some text. When the menu item is clicked, the selected text is searched for at

  The configuration file ('config.xml').
<?xml version='1.0' encoding='utf-8'?>
<widget xmlns="">
    <feature name="opera:contextmenus"/>
// The background process (e.g. '/background.js').

if ( {
  var menu =;

  // Create a menu item properties object
  var itemProps = {
    contexts: ['selection'],
    title: 'Find in Wiktionary',
    onclick: function(event) {
      var query = encodeURIComponent(event.selectionText);

      // Create a tab properties object
      var tabProps = {
        url: '' + query

      // Create a tab with the specified properties
      var tab = opera.extension.tabs.create(tabProps);

  // Create a menu item with the specified properties
  var item = menu.createItem(itemProps);
  // Add the menu item to the context menu

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