AngularJS: $watch for a select input

Question

I know we can use ng-change to solve this but I would like to understand why $watch doesn\'twork on select. Maybe I\'m doingsomething wrong but it seems I am not the only on

Answer 1

For make it working you need to do number of changes in your code, You need to put all server related information to one object named as self.serverInfo that will contain the information about server & servers directly bind this with scope variable will update binding automatically as per JavaScript Prototypal inheritance.

HTML

  

    
      

        Server
      
      {{serverInfo}}
      
      
    
  

Controller

var app = angular.module('app',[]);

app.controller('SettingsCtrl', function ($scope, $log, serverSelection) {

    //List of servers to connect to
    $scope.serverInfo= serverSelection.serverInfo;
    $scope.$watch('serverInfo.server', function(NewValue, OldValue) {
        $scope.url = $scope.serverInfo.server.url;
    }, true);

})

app.service("serverSelection", function() {
    var self = this;
    self.serverInfo = {};
    self.serverInfo.servers = [
        { label: 'Production', value: 1, url: 'url1' },
        { label: 'Training', value: 2, url: 'url2' },
        { label: 'Local', value: 3, url: 'url2' }
    ];

    self.serverInfo.server = self.serverInfo.servers[1];
    console.log(self.server);
    self.serverInfo.url = self.serverInfo.server.url;

})

Working Plunkr