$ .getJson在事件发生之前不会影响视图

Didn't really know how to word the question. Using angular. Anyways, I'm trying to have it so when the user types in the text box a state, once it has been verified that the state exists (comparing to an array of all 50), it will automatically call a getJSon Jquery request for a JSON object. But for some reason, it doesn't execute right away, instead I have to press a key after doing so.Didn't really know how to word the question. Us