javascript - Input Validation in AngularJs Form -

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problem,

Either way I can not validate the verification with the ERRS < p> I have made a plunker. I should only make the user input box red if the required field is not present or submit. I have made a very simple planer, just to understand. 

  & lt; Input type = "text" name = "email" ng-model = "userEmail" required & gt;   
 Please   
 
 
 Go to this tutorial. This will give you an introduction to verification.  
 And if you want the verification message to appear, click on the submit button to use a flag when you click on the flag, then set the flag to the right and below the angularJs Use conditions located in  
  & lt; Div class = "form-group" ng-class = "{'has-error': SubmitClicked & userForm.email. $ Invalid and & amp;; userForm.email. $ Pristine}" & gt;   
 and click the Submit button to set the submit flag to the correct  
  & lt; Button type = "submit" class = "btn btn-primary btn-large" ng-click = "submit = true" & gt; Submit & lt; / Button & gt;   
 And you can also try it

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