Model is updated by checkbox only on the second click

Take a look at this Plunkr example here: http://plnkr.co/edit/hwVL3xtnD9hGJL?p=preview

After clicking the checkbox for the first time, the model fails to update. Can you explain why?

var app = angular.module('main', ['ngMaterial'])
    .controller('DemoCtrl', function($scope, $filter, $http) {
      $scope.propdata = [];
      $scope.success ="loading..";
      var url = "api.json";
       $http({url:url,
         method:"GET"
       }).then(function (rs){
         $scope.propdata = rs.data[0];
         $scope.success ="done..";
       });
    });
javascriptangularjscheckbox

Answer №1

The JSON data you are receiving contains a value of 1, rather than true or false. If you update the data to use true or false, it will correctly interpret the initial value. Alternatively, you can convert the "1" to a boolean before assigning it.

Additional Note:

An alternative approach is to specify the ng-true-value and ng-false-value attributes on your checkbox so that it can handle the 0 and 1 values that you have. The single quotes surrounding "'1'" indicate that it should be treated as a string. See the example below:

HTML

<div class="checkbox {{font_size}}">
     <label for="garden_service">
          <input type="checkbox" id="garden_service"
                      ng-checked="propdata.garden_service==1" ng-true-value="'1'" ng-false-value="'0'"
                       ng-model="propdata.garden_service">Garden Service <br/>model value:{{propdata.garden_service}}
     </label>
</div>

http://plnkr.co/edit/t280UjC3NYNtQt28W1wm?p=preview

Official documentation link: https://docs.angularjs.org/api/ng/input/input%5Bcheckbox%5D

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