How to make it so that if certain fields of the forms are completed send a request to the server?

There is a form
how to make so that if all fields to the field "product Name and list of accessories*" filled sent a request to the server?
June 5th 19 at 21:07
1 answer
June 5th 19 at 21:09
well, like @focus field "product Name" to hang up the handler and there is a check filled fields and send the request.

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