Exploring the potential of $scope within $timeout in AngularJS

I am attempting to display a default message on a textarea using AngularJS. Some of the values I want to include require the use of $timeout to retrieve the values.

The message does not appear to show up with the following code:

    <textarea class="text-input referral-message" ng-init="message=buildMessage(purchase_count)" 
              ng-model="message" rows="5">
    </textarea>

$timeout(function() {

    ReferralService.settings().$promise.then(function(settings) {
        $scope.purchase_count = settings.credits;
    });

    $scope.buildMessage = function(val){
      return "Purchase " + val + " and receive 1 free with each purchase"
    }
}, 1);

Answer №1

Check out the scope.apply function and consider using the following code snippet (please note that this code is based on my memory and may not be fully functional):

ReferralService.settings().$promise.then(function(settings) {
  $scope.$apply(function(){
     $scope.message = "Purchase " + settings.credits + " credits and receive 1 free for each purchase";
  });
});

Also:

<textarea class="text-input referral-message" ng-model="message" rows="5">
</textarea>

Note: You may not need to use $timeout.

Additional note: Consider implementing ReferalService as a factory (angular.service vs angular.factory), as it may provide additional assistance.

Answer №2

You have the ability to utilize double curly braces to showcase content from the data model

<textarea class="text-input referral-message" rows="5>{{message}}
</textarea>

$timeout(function() {

ReferralService.settings().$promise.then(function(settings) {
    $scope.purchase_count = settings.credits;
    $scope.message = "Purchase " + $scope.purchase_count + " items and receive 1 free with every purchase"
});

}, 1);

Answer №3

Avoiding the use of ngInit in this scenario is recommended, as it introduces unnecessary complexity to your template.

To simplify your code, eliminate the ng-init directive from the textarea and initialize the message variable once the promise is fulfilled:

ReferralService.settings().$promise.then(function (settings) {
    $scope.message = buildMessage(settings.credits);
});

function buildMessage(val) {
    return "Buy " + val + " and get 1 free for every purchase"
}

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