Published at DZone with permission of Loiane Groner, author and DZone MVB. (source)
Today’s example is an ExtJS 4 Form unique field value validation,
done on the server side. Do you know when you are going to register in a
new social network and you have to choose a username (and this username
must be unique)? This is the case we are going to handle in this
I also implemented this example using Sencha Architect 2.
Source Code: https://github.com/loiane/sencha-extjs4-examples-architect/tree/master/extras/UniqueFieldValidation
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