What is the best approach to synchronize checkboxes with boolean values in my data model?

I've spent hours searching through similar questions, but haven't found a solution that perfectly matches my issue. What I need is to have a checkbox automatically checked based on a true/false value in my data using data binding. While I can successfully load the item names and retrieve checkbox values for saving to the server later, I'm struggling with getting the initial values to display correctly.

Here's a simple example highlighting the core problem; HTML:

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.6/angular.min.js"></script>
<script src="shoppingListNg.js"></script>
<body ng-app>
<div ng-controller="ShoppingListCtrl">
    <table>
        <tr ng-repeat="item in shoppingList">
            <td>
                <div>{{item.text}}</div>
            </td>
            <td>
                <input type="checkbox" ng-model="item.isGotten" />
            </td>
         </tr>
     </table>
  </div>
  </body>
 

And here is the JavaScript code:

function ShoppingListCtrl($scope) {
      $scope.shoppingList = [
          {
             "text": "V8 fusion",
             "isGotten": "true"
           }, 
           {
              "text": "Whole milk container",
              "isGotten": "false"
           },
           {
             "text": "Protein bars",
             "isGotten": "true"
           }
       ];
   };

Can you figure out why the checkboxes are not reflecting the "true" and "false" values in the model? They always appear unchecked when the page loads. Should I be using ng-checked or another directive?

Answer №1

An issue arises from using quotes around "true" and "false", turning them into strings rather than booleans that Angular can bind to the checkbox.

By simply removing the quotes, your code will function correctly. You can see a functional example at http://plnkr.co/edit/hjNKSmlWUEqo1CFLwPQv.

function GroceryListCtrl($scope) {
    $scope.groceryList = [
      {
      "item": "Apples",
      "purchased": true
      }, 
      {
      "item": "Bread loaf",
      "purchased": false
      },
      {
      "item": "Frozen pizza",
      "purchased": true
      }
   ];
};

Answer №3

When it comes to handling data, sometimes using true/false boolean values may not be the best approach in your code. AngularJS automatically converts true/false and 1/0 booleans into strings, so working with strings directly might be more advantageous.

In the example provided below, I utilize "1" and "0" as boolean values, along with ngTrueValue and ngFalseValue to ensure proper binding in AngularJS. It's a straightforward and neat solution.

You can access the codepen demo here: http://codepen.io/paulbhartzog/pen/kBhzn

Here is a snippet of the code:

<p ng-repeat="item in list1" class="item" id="{{item.id}}">
  <strong>{{item.id}}</strong> <input name='obj1_data' type="checkbox" ng-model="list1[$index].data" ng-true-value="1" ng-false-value="0"> Click this to change data value below
</p>
<pre>{{list1 | json}}</pre>

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