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dhtmlxcombo allow only valid options in autocomplete mode

HI,

Ik have a dhtmlxcombo in autocomplete filtering mode. Where the data is filled from the database. I'ld like to achieve the following:

-not allow to submit if empty (give warning)
-only allow value's contained in the combobox while giving an warning if that is not the case.

i'ld like this all to work while using a submit button or hitting the enter key.

kind regards,

Nasir