ruby on rails - How do i display validation error from controller using angularjs? -


I'm new to angular railways and I'm completely confused, I'm trying below code and do not know I'm sure it's right.

index.html 

  & lt; Div class = "input-group" ng-controller = "validation controller" & gt; & Lt; span class = "input-group-connector" & gt; & Lt; Span class = "glyphicon glyphicon-calendar" & gt; & Lt; / Span & gt; & Lt; / Span & gt; & Lt;% = text_field_tag: checkand, param [[checkdate]] :: placeholder = & gt; 'Select Date' ,: Category = & gt; 'Form-Control Datapicator Input-LG': Required = & gt; Truth, "NG-Model" = & gt; "Checkin.date"%> & Lt; / Div & gt; & Lt; div class = "input-group" ng-controller = 'validation controller' & gt; & Lt; span class = "input-group-connector" & gt; & Lt; Span class = "glyphicon glyphicon-calendar" & gt; & Lt; / Span & gt; & Lt; / Span & gt; & Lt;% = text_field_tag: checkoutdate, parameters [: checkoutdate],: placeholder = & gt; 'Select Date' ,: Category = & gt; 'Form-Control Datapicator Input-LG': Required = & gt; Truth, "NG-Model" = & gt; "Checkout.date"%> & Lt; / Div & gt; & Lt; P ng-show = 'isInvalidDate ()' & gt; The checkout date can not be less than the checkin date & lt; / P & gt;   
  Validation controller.js   
  App.controller ('Validation Controller', ['$ scope', function ($ Scope) {$ Scope.isInvalidDate = function () {return $ scope.checkout.date & lt; $ scope.checkin.date;}}]));   
  App.js   
  var app = angular Module ('app', []);   
 Now when I'm checking less than the date of checkin, the error is not displayed. Can anyone tell me in the right direction?  
  
 
 
 A  controller  only works on this DOM-element and its Children are declared.  
  & lt; P ng-show = 'isvalidDate ()' & gt; The checkout date can not be less than the checkin date & lt; / P & gt;   
 Both are outside the scope of their controllers.  
 Since you are trying to compare the value of both  input  s, D to both of them and  p  Need to keep elements inside the element with the  ng-controller  attribute.  
 In addition, the way you are using the  ng-controller  attributes, you think that you consider it a singleton. In your case, you have two examples of  administrator , one of them knows about check-date and the other person knows about the checkout date. None of them will really be able to do validity.

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