How to show entry id during filling up the form prior to submit ?

Hi,

I basically want to show my user an unique id before he/she submits the form. I was trying to add the entry id, however this does not work prior to submitting the form. Does anyone know a way to show some sort of unique id before submitting or just making the entry id work before submitting ?

Thank you

Thanks for that Rob. I wanted something before submit.