Extracting data from a JSON object using Angular 2

Question

Extracting data from a JSON object using Angular 2

I need advice on the most efficient way to handle JSON within my angular2 application.

The JSON data I am working with includes:

{
    "rightUpperLogoId": {
        "id": 100000,
        "value": ""
    },
    "navbarBackgroundColorIdCss": {
        "id": 100001,
        "value": ""
    },
    "backgroundColorIdCss": {
        "id": 100002,
        "value": ""
    },
    "translationIdFrom": {
        "value": "90000"
    },
    "translationIdTo": {
        "value": "90055"
    }
}

This JSON serves as a configuration file for the user interface of my application. Specifically, I am interested in retrieving the id from rightUpperLogoId, which is 100000. Upon obtaining this id, I aim to make a GET request to my backend REST API and then assign the returned value to 'value'. Any guidance or assistance on how to achieve this task would be greatly appreciated. Thank you.

json serialization typescript angular

Answer 1

Answer №1

To optimize your code, consider utilizing Rx operators such as flatMap in conjunction with Observable.forkJoin and Observable.of.

Take a look at this example:

this.http.get('config.json')
       .map(res => res.json())
       .flatMap(config => {
         return Observable.forkJoin(
             Observable.of(config),
             // Customize the request as needed
             this.http.get(
               `http://.../${config.rightUpperLogoId.id}`)
         );
       })
       .map(res => {
         let config = res[0];
         let rightUpperLogoIdValue = res[1].json();

         config.rightUpperLogoId.value = rightUpperLogoIdValue;

         return config;
       })
       .subscribe(config => {
         // manipulate the config object
       });

If you need additional guidance, check out this resource for more insights on data aggregation:

Answer 2

To optimize your code, consider utilizing Rx operators such as flatMap in conjunction with Observable.forkJoin and Observable.of.

Take a look at this example:

this.http.get('config.json')
       .map(res => res.json())
       .flatMap(config => {
         return Observable.forkJoin(
             Observable.of(config),
             // Customize the request as needed
             this.http.get(
               `http://.../${config.rightUpperLogoId.id}`)
         );
       })
       .map(res => {
         let config = res[0];
         let rightUpperLogoIdValue = res[1].json();

         config.rightUpperLogoId.value = rightUpperLogoIdValue;

         return config;
       })
       .subscribe(config => {
         // manipulate the config object
       });

If you need additional guidance, check out this resource for more insights on data aggregation:

Extracting data from a JSON object using Angular 2

Answer №1

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