AngularJS not refreshing the view

I'm having an issue in my app where I calculate the total bill and display it on my view. The first time, everything works fine. However, when I increment the $scope.bill_total, the view is not updating even though I can see the change in the console. I've tried using $scope.$apply() but it throws an error. Can anyone explain why the view is not updating in this general case?

HTML

 <div id="total" class="col col-30 cart-item text-right text-black">
            Bill Total<br/> ${{ bill_total }}
        </div>
<button class="button button-small button-light"  ng-click="increment()"> +</button>

JavaScript:

$scope.calculate = function () {
    $scope.bill_total = parseFloat($scope.gross_bill) + parseFloat($scope.taxes) + parseFloat($scope.tips);
}

$scope.calculate();

$scope.increment = function () {
    $scope.gross_bill++;
    $scope.calculate();
    console.log($scope.bill_total )
}       

Answer №1

It seems like you may need to take a closer look at your code. Why are you updating gross_bill instead of expecting bill_total to change?

If gross_bill is not being used in your template, then changing its value will not trigger a view update.

Make sure to modify the elements that are bound in your template. If for some reason you still require scope.apply, consider wrapping your code in a $timeout function to trigger a digest cycle, as this is the recommended approach over calling apply directly.

Here are some notes on apply vs timeout

Answer №2

After reviewing the visible portion of your source code, everything appears to be in order. To ensure that all components are within the same digest scope, you can perform an asynchronous application manually:

$scope.increment = function () {
    setTimeout(function () {
        $scope.gross_bill++;
        $scope.calculate();
        $scope.$apply();
        console.log($scope.bill_total );
    });
} 

Additionally, please verify the following points as well:

  • Check if bill_total is bound only once using {{ ::bill_total }}
  • Confirm if the directive scope is isolated with one-way binding for bill_total

Answer №3

The issue may lie in the fact that the variable $scope.bill_total is not currently an object, preventing it from being watched. To resolve this, consider changing it to something along the lines of $scope.bill_total = {value: 3}. By doing so, any updates made to the value will be accurately reflected in your view without the need for calling $scope.apply, as you are already operating within a digest cycle.

Remember to update your HTML to reflect the changes:

<div id="total" class="col col-30 cart-item text-right text-black">
  Bill Total<br/> ${{ bill_total.value }}
</div>

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