AngularJS modal directives trigger a reset of $scope variables

I am developing a custom AngularJS application that needs to handle and store all the checkbox selections made by the user in a simple array of IDs. The functionality includes displaying a modal when the open button is clicked, allowing the user to perform certain actions. However, I encountered an issue where upon closing the modal, the array containing the IDs gets reset, requiring the user to reselect the checkboxes to save the IDs again.

Below is a snippet of my code: App.js

app.controller("requestsCtrl",["$scope", "$rootScope", "crud", function($scope, $rootScope, crud){

$scope.selectedItemsId = [];
$scope.checkedAllActive = false;

// Other controller logic here...

}]);

// Other Angular directives and services are defined here....

Index.jade

script(type="text/ng-template" id="requests.html")
  <!-- Template content for requests -->

Answer №1

Implement the ng-if directive to manage the visibility of the modal template. The ng-if directive creates a separate scope for handling watchers and directive bindings set up by the $compile service, allowing them to be properly removed when no longer needed. This prevents memory leaks that can occur if these elements are not cleared out.

$rootScope is powerful, but use it wisely

In AngularJS, scopes are organized in a hierarchy, inheriting properties from a root scope at the top layer. In most cases, this structure is transparent because each view has its own controller and scope.

However, there may be instances where certain data needs to be accessible globally across the app. In such scenarios, you can utilize $rootScope to store and retrieve values like with any other scope. Since child scopes inherit from the root scope, these shared values will be accessible in expressions linked to directives such as ng-show, similar to local $scope variables.

It is essential to exercise caution when utilizing $rootScope extensively, treating it like global variables in traditional programming languages. It's recommended to avoid adding executable code directly on $rootScope, focusing instead on storing only data. If considering placing a function on $rootScope, opting for a service that can be injected wherever necessary is generally more favorable and facilitates easier testing.

On the flip side, creating services solely for managing and accessing small pieces of data should also be avoided.

— AngularJS FAQ

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