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This documentation relates to Opera's now deprecated .oex Extension API framework for Opera versions <= 12.15 and also provided by our OEX2NEX shim library.

For the latest Opera Extensions API documentation for Opera versions > 12.15 please consult the latest Opera Extensions API documentation online.


The update() method provides a way to update the properties of a browser window.



void update (BrowserWindowProperties properties)


The following example creates a button in the browser toolbar. When the button is clicked, the last focused window is detected and the width is changed to 320 pixels.

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

// Specify the properties of the button before creating it.
var UIItemProperties = {
  disabled: false,
  title: "Window creation test",
  icon: "images/icon_18.png",
  onclick: function() {
    // Get the last focused browser window
    var thisWin = opera.extension.windows.getLastFocused();
    // Change the window's width to 320 pixels
    thisWin.update({width: 320});

// Create the button and add it to the toolbar.
var button = opera.contexts.toolbar.createItem( UIItemProperties );