angularjs - variable didn't change while another variable changes -


i'm trying convert sessionlength seconds , save in variable called totaltime (totaltime = sessionlength * 60). in script, user can click button increase/decrease sessionlength. problem totaltime didn't change sessionlegnth changed. can point out did go wrong? in advance!

var myapp = angular.module('myapp', []); myapp.controller('pomodorotimer',function pomodorotimer($scope) {     $scope.breaklength = 5;     $scope.sessionlength = 25;      $scope.totaltime = $scope.sessionlength * 60;      $scope.decreasenumber = function() {       $scope.sessionlength--;     };      $scope.increasenumber = function() {       $scope.sessionlength++;     };     });

you not recalculating total time after session length changes, can this:-

var app = angular.module("myapp", []);  app.controller("myctrl", function($scope) {     $scope.breaklength = 5;      $scope.sessionlength = 25;       $scope.calctotaltime = function(){        $scope.totaltime = $scope.sessionlength * 60;      }            $scope.decreasenumber = function() {        $scope.sessionlength--;       $scope.calctotaltime();      };      $scope.increasenumber = function() {        $scope.sessionlength++;        $scope.calctotaltime();      };            $scope.calctotaltime();  });
<!doctype html>  <html>  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>  <body>    <div ng-app="myapp" ng-controller="myctrl">       <button ng-click="increasenumber()">increase</button>   <button ng-click="decreasenumber()">decrease</button>   <br>   session length:{{sessionlength}}<br>   total time:{{totaltime}} <br>  </div>


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