javascript - AngularJS ng-show icons not working properly after sorting -


i'm implementing sorting ng-repeat , sorting works fine.

however, when comes showing/hiding carets on each button, first button's caret switches down, regardless of button click.

code below: html:

    <button ng-click="sortquestions('createdat')" class="sort-button chip grey darken-2 white-text">newest         <span ng-show="showcaretdown('createdat') === true"><i class="fa fa-caret-down"></i></span>         <span ng-show="showcaretup('createdat') === true"><i class="fa fa-caret-up"></i></span>     </button>     <button ng-click="sortquestions('updatedat')" class="sort-button chip grey darken-2 white-text">last updated         <span ng-show="showcaretdown('updatedat') === true"><i class="fa fa-caret-down"></i></span>         <span ng-show="showcaretup('updatedat') === true"><i class="fa fa-caret-up"></i></span>     </button>     <button ng-click="sortquestions('numberofanswers')" class="sort-button chip grey darken-2 white-text">answers         <span ng-show="showcaretdown('numberofanswers') === true"><i class="fa fa-caret-down"></i></span>         <span ng-show="showcaretup('numberofanswers') === true"><i class="fa fa-caret-up"></i></span>     </button>     <button ng-disabled="true" ng-click="sortquestions('votes')" class="sort-button chip grey darken-2 white-text">votess         <span ng-show="showcaretdown('votes')"><i class="fa fa-caret-down"></i></span>         <span ng-show="showcaretup('votes')"><i class="fa fa-caret-up"></i></span>     </button>      <div ng-repeat="question in questions | orderby:sort.propertyname:sort.ascending" class="card-panel">     ....     </div>

controller:

$scope.questions = []; $scope.sortascending = true; $scope.sort = {     propertyname: 'createdat',     ascending: true };   $scope.questions = questionservice.getquestions().then(function success(response) {     logger.info("returned questions data: ", response.data);     $scope.questions = response.data._embedded.questions;     logger.info("$scope.questions: ", $scope.questions);     logger.info("is $scope,questions array? ", angular.isarray($scope.questions)); }, function error(response) {     logger.error("error getting questions: ", response.data);     $scope.error = response.data; });  $scope.sortquestions = function(sortpropertyname) {     logger.info("sorting ", sortpropertyname);     $scope.sort.properyname = sortpropertyname;     $scope.sort.ascending = !$scope.sort.ascending; };  $scope.showcaretdown = function(sortpropertyname) {     return $scope.sort.propertyname === sortpropertyname && !$scope.sort.ascending; };  $scope.showcaretup = function(sortpropertyname) {     return $scope.sort.propertyname === sortpropertyname && $scope.sort.ascending; };

you don't need 2 functions. can using single function using ng-show , ng-hide directive. below way. didn't check when showandhidcareticon() function triggering.

<button ng-click="sortquestions('createdat')" class="sort-button chip grey darken-2 white-text">newest         <span ng-show="showandhidcareticon('createdat') === true"><i class="fa fa-caret-down"></i></span>         <span ng-hide="showandhidcareticon('createdat') === true"><i class="fa fa-caret-up"></i></span>     </button>

and 

$scope.showandhidcareticon = function(sortpropertyname) {     return ($scope.sort.propertyname === sortpropertyname && $scope.sort.ascending); };

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