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

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I'm very new to ExtJS and JS. I was hoping someone could tell me if there is a way to check for repeated rows of the same name when entering a string into a textfield. Is there anything similar to "allowBlank: false" that could be used to check if the string already exists in a row? Or will I simply need to do validation through a series of loops? Please tell me if anything is unclear in my question.

(also my first stack overflow post, so please let me know if there is anything I should have done differently with formatting/tagging)

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