Checkbox Event Restricts Access to a Single Class Variable

As a beginner in AngularJS (just diving in this week), I've encountered an issue with a checkbox input connected to an ng-change event.

<input type="checkbox" ng-model="vm.hasCondoKey" ng-change="vm.onKeyCheckboxChange()" />

The ng-change event triggers the execution of the "onKeyCheckBoxChange" function in the controller.

export class CondoKeyController {

    public condoKey: AdditionalItemModel;
    public additionalItems: AdditionalItemModel[];
    public hasCondoKey: boolean = false;

    static $inject = ["$scope","CondoKeyService"];

    constructor($scope: any, CondoKeyService: ICondoKeyService) {
        // Some initialization logic here
    }

    public onKeyCheckboxChange(): void {
        console.log("Checkbox changed.");
        if(this.hasCondoKey === true) {
            // Handling of condoKey logic
        } else {
            // Resetting condoKey quantity
        }
    }
}

The "CondoKeyController" receives the array "additionalItems" from a parent component via a directive. While some variables can be accessed within the "onKeyCheckBoxChange" function, others like "this.condoKey" and "this.additionalItems" pose a challenge.

I'm puzzled by the ability to access certain variables but not others in the function. Any insights on why this is happening and how to overcome it?

If you have a clue on why I can't access all variables or how to rectify this issue, please share your thoughts.

Angularjs 1.6.6 Typescript ~2.3.1

Answer №1

Enhance the method by adding helpful debug logs:

public onKeyCheckboxChange(): void {
        console.log("Checkbox changed.");
        console.log(this.condoKey);
        console.log(this.additionalItems);
        // ...
}

Review the output. It's important to note that condoKey and additionalItems may be undefined, indicating they have not been initialized.

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