Is there a more efficient way to manage interactions between multiple controls on a form than using $scope.$watch? This cleaner approach

Question

Is there a more efficient way to manage interactions between multiple controls on a form than using $scope.$watch? This cleaner approach

Currently, I am creating an Angular application that includes a form with approximately 15 controls for a finance-related application. I would appreciate advice on how to improve the structure without suggesting a complete page overhaul.

Several of the controls are interdependent. Five input controls act as sources and can impact five other controls that serve as destinations. To handle this, I have implemented $scope.$watch on each source variable and included specific logic in the watch functions to determine which destination variables need updates. Below is an example of one such watch function:

$scope.$watch('money.price',function(newVal,oldVal) {

    if(newVal != oldVal) {

        if($scope.money.quantity != undefined) {
            updatePrincipal($scope)
            updateFees($scope);
            $scope.money.net = $scope.money.principal + $scope.money.fee 
        }
    }
});

Despite the functionality working, I feel there might be a more elegant solution. Are there any suggestions on how to enhance or streamline this process? (Please keep in mind that the form may become slightly more complex in the future with 2-3 additional dependency fields, but not exceeding that).

javascript angularjs

Answer 1

Answer №1

If your input controls are linked to an ng-model, it's suggested to include ng-change in each input form. This way, you can streamline the process by using a single function to update all scope bindings simultaneously.

Answer 2

If your input controls are linked to an ng-model, it's suggested to include ng-change in each input form. This way, you can streamline the process by using a single function to update all scope bindings simultaneously.

Answer 3

Answer №2

Utilize the built-in $watch functionality of the ng-bind directive.

<div ng-bind="calculateRevenue()"></div>

     OR MORE SIMPLY

{{ calculateRevenue() }}

Avoid manually creating a $watch in your controller by defining the necessary function.

 $scope.calculateRevenue = function() {
     if ($scope.sales.amount != undefined) {
        updateEarnings($scope)
        updateExpenses($scope);
        $scope.revenue.total = $scope.sales.earnings - $scope.expenses.amount 
     };
     return $scope.revenue.total;
 };

With this setup, the $watch created by the ng-bind directive will automatically compute the value of revenue.total and update the DOM as needed during each digest cycle.

Answer 4

Utilize the built-in $watch functionality of the ng-bind directive.

<div ng-bind="calculateRevenue()"></div>

     OR MORE SIMPLY

{{ calculateRevenue() }}

Avoid manually creating a $watch in your controller by defining the necessary function.

 $scope.calculateRevenue = function() {
     if ($scope.sales.amount != undefined) {
        updateEarnings($scope)
        updateExpenses($scope);
        $scope.revenue.total = $scope.sales.earnings - $scope.expenses.amount 
     };
     return $scope.revenue.total;
 };

With this setup, the $watch created by the ng-bind directive will automatically compute the value of revenue.total and update the DOM as needed during each digest cycle.

Is there a more efficient way to manage interactions between multiple controls on a form than using $scope.$watch? This cleaner approach

Answer №1

Answer №2

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