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How can I prevent duplicate values using ajax?

Question asked by Abhi Abhi on Apr 28, 2014
Latest reply on Apr 29, 2015 by Maulik Shah
i have create module   using module builder , now i am having a field called as book Name
now if i give same book name 2 time t is accepting .

 i don't want to use and plug in for checking duplicate value because i want to learn the customization through code .

so i can call ajax and check in data base weather the same book name is exist in db or not but i don't know  how controller works in sugar crm . and how to call ajax in sugar crm . 

can any one guide me , your help is much appreciated .  

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