How to check uniquness while pushing values into array using Angular JS?

Question

  $scope.displayyears = [];
  $scope.Joinyear = function(display) {
    $scope.yeardisplay = display;       
    $scope.yeardisp = $scope.displayyears.push($scope.yeardisplay);
    $scope.displayyearss = uniq($scope.yeardisp)
  }

it throws error like "uniq is undefined"..How we check uniqueness??

Possible duplicate of how to prevent duplicate in array push in angularjs — Dave DuPlantis
– Dave DuPlantis, Commented May 3, 2017 at 20:09

Iftah · Accepted Answer · 2013-01-30 09:32:42Z

24

Try checking if the yeardisplay is already in the array before you add it

$scope.displayyears = [];
$scope.Joinyear=function(display){
     $scope.yeardisplay=display;        
     if ($scope.displayyears.indexOf(display) == -1) {
         $scope.displayyears.push(display);
     }
}

answered Jan 30, 2013 at 9:32

Iftah

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5 Comments

Iftah Over a year ago

You are welcome :) You can mark the question as 'Answered' by clicking the checkbox (below the voty of the answer). This will save time for other readers who look for unanswered questions, and serve as a 'thank you' to the person who wrote the answer (no need to comment 'thank-you's in this website).

GMan Over a year ago

is the line '$scope.yeardisplay=display; ' necessary? just curious?

Iftah Over a year ago

Definitely not necessary, I don't know what's it for. I'm guessing it is displayed somewhere on his page. I was just modifying the push+uniq combo into valid js code and left the rest of it untouched.

b2238488 Over a year ago

FYI, this does not work in IE8 and below because they don't support "indexOf"

Iftah Over a year ago

@b2238488 you are right, thanks. For older browsers the same can be accomplished with jQuery's inArray: api.jquery.com/jQuery.inArray but Angular.js doesn't support IE8 as well so I think its safe to use indexOf for an Angular.js question.

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