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To check for unique vaule with database while entering a new value?

Question asked by Tkr Karthikeyan on May 13, 2015
Latest reply on Jun 29, 2015 by Tkr Karthikeyan
for example, I have a field called Personal Id. While creating a new personal Id , I wish to check the database for any duplicate Id present and show a textfield tip "Id already in use. please try another" or "SIMILAR MATCH, Please enter another value". 

I have tried with logic hooks and i display a alert , on clicking ok it redirects to the page and blanks all the other field value which i already entered.

Please help on this regard, i tried searching for almost a week on this and still not getting a solution.