Utilizing AngularJS with Typescript to Invoke Child Object Method from HTML

I am currently developing an angular application where I am attempting to invoke a method from a child object within a repeater. The situation involves having a selected item with a company property. This company property contains a getAddressText() method that returns the address text for the company, which I want to display on the screen.

Here is the code snippet to provide context for my query. Upon testing the application, I noticed that ctrl.selectedItem.Company is being correctly accessed, but it seems to be disregarding the function call.

Below are the HTML and AngularJS code snippets:

<span>{{ctrl.selectedItem.Company.getAddressText()}}</span>

Typescript:

namespace app.controllers {
    class MyController {
        public selectedItem: app.models.Item;
    }
}
namespace app.models {
    export class Item {
        public Company: Company;
        constructor() {}
    }
    export class Company {
        constructor() {}
        getAddressText(): string {
            return "Some text...";
        }
    }
}

Answer №1

One issue arises when retrieving plain JavaScript objects from a service in JSON format. While these objects may resemble Item and Company with similar properties, they lack the necessary methods.
To ensure instances of the specified types are created, it is recommended to map the JSON objects to these types. This can be done within the service itself or by utilizing $http's transform response function if data is fetched using $http:

var convertedItems = jsonItems.map(i => {
    var item = new Item();
    item.Company = new Company();
    //map required properties from i (or use some library for cloning)
    return item;
});

Alternatively, consider transferring logic(methods) to a helper class, controller, or service while keeping the data objects clean. Defining interfaces would suffice in this scenario.

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