ng-if behaving unexpectedly

This is a demonstration of how I populate the Table and attach checkboxes to a controller:

<tr ng-repeat="key in queryResults.userPropNames">
      <td><input type="checkbox"
                 data-ng-checked="selectedKeys.indexOf(key) != -1"
                 data-ng-click="toggleSelect(key)">

      </td>
      <td>{{key}}</td>
      <td ng-repeat="user in queryResults.users">
        {{user.properties[key]}}
      </td>
    </tr>

Here is my button's HTML code:

<div>
    <span ng-if="!validKeys" class="button-terminal primary save-user-keys"
          data-disabled="false">Save Keys</span>
    <span ng-if="validKeys" class="button-terminal primary save-user-keys"
          data-ng-click="saveUserKeys()">Save Keys</span>
  </div>

Below is how my Controller is structured:

$scope.toggleSelect = function (attribute) {
    if ($scope.selectedKeys.indexOf(attribute) === -1) {
        $scope.selectedKeys.push(attribute);
    } else {
        $scope.selectedKeys.splice($scope.selectedKeys.indexOf(attribute), 1);
    }
};

$scope.saveUserKeys = function() {
    $scope.customAttributes.mappingForUser = $scope.selectedKeys;
    $scope.saveMappings();
};

$scope.validKeys = !!$scope.selectedKeys;

Despite this setup, the button always remains enabled, even when all checkboxes are deselected.

I am seeking assistance in identifying the issue with this code. Thank you.

Answer №1

Even when no keys are selected, $scope.selectedKeys remains an Array. It is important to note that empty Arrays are considered truthy (!![] // => true).

To address this issue, one solution could involve checking the length of selectedKeys:

$scope.validKeys = $scope.selectedKeys && $scope.selectedKeys.length;

Alternatively, if setting validKeys was simply a step towards proper rendering in the view, you can update the ngIf like so: ng-if="selectedKeys.lengh"

Answer №2

When examining validKeys (i.e. {{validKeys}}), do you observe fluctuations between true and false? Additionally, my understanding suggests that the ideal approach is to assess the length of validKeys - if it exceeds 0, activate the button; otherwise, deactivate it.

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