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The OnClientSelectedTabChanging client-side event occurs when the user clicks on a ribbonbar tab, before the ribbonbar responds to the mouse click.

The event handler receives two parameters:

  1. The instance of the ribbonbar firing the event.

  2. An eventArgs parameter containing the following methods:

    • get_tab() returns a reference to the ribbonbar tab which is about to be selected.

    • get_previouslySelectedTab() returns a reference to the currently selected tab.

    • get_domEvent() returns the DOM event object.

    • set_cancel() lets you cancel the event and prevent changing the selected tab.

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