[jQuery] [autocomplete] clearing the input field if the user does not select any of the options

[ssmusoke]

Hello,

How can I clear the input field if the user does not select any of the
options.

I have tried mustMatch but in IE it seems that the text typed must
match the options. Maybe I am not getting it right

My options are
$("#auto_dropoff_state").autocomplete(dropoff_statecity, {
        width: 250,
        matchContains: true,
        autoFill: false
});

Thanks in advance