OnClientSelectedTabChanged
The OnClientSelectedTabChanged client-side event occurs when a non-selected tab is clicked.
The event handler receives two parameters:
The instance of the ribbonbar firing the event.
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An eventArgs parameter containing the following methods:
get_tab() returns a reference to the ribbonbar tab which is the new selected tab.
get_previouslySelectedTab() returns a reference to the previously selected tab of the ribbonbar.
get_domEvent() returns the DOM event object.