javascript - ExtJS 5: How do I throw an error for repeating rows? -

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i'm new extjs , js. hoping tell me if there way check repeated rows of same name when entering string textfield. there similar "allowblank: false" used check if string exists in row? or need validation through series of loops? please tell me if unclear in question.

(also first stack overflow post, please let me know if there should have done differently formatting/tagging)


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