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+Events can be triggered by form elements, in the example
+we assign the function \textit{validateTime()\/} as an event
+handler for the Validate event of the
+\textit{zeit} choice list.
+\begin{lstlisting}
+validate={validateTime();}
+\end{lstlisting}
+If the user leaves the choice field the function is invoked
+and turns the ``from'' and ``until'' text fields visible
+\begin{lstlisting}
+this.getField("von").display = display.visible;
+this.getField("bis").display = display.visible;
+\end{lstlisting}
+or invisible.
+\begin{lstlisting}
+this.getField("von").display = display.hidden;
+this.getField("bis").display = display.hidden;
+\end{lstlisting}
+\lstinputlisting{../examples/ex0010.tex}