What is the best way to map JSON object properties to specific values in Typescript?

Question

What is the best way to map JSON object properties to specific values in Typescript?

Currently, I am working with angular 2.0 and I have a json object that is returned by a method in the following way.

this.propertiesService.addSeriesToChart(this.testId).subscribe(result => {
        this.result = result;
        });

The addSeriesToChart() method is located in a service which returns a json object.

Within the returned result, I need to assign default values to some of the null values. My attempt looks like this:

if (this.result != undefined && this.result != null) {
  this.result.json().channel.mark = "ABC"

However, the mark parameter inside the json object does not get set to "ABC", it remains null. Am I making a mistake here?

angular typescript

Answer 1

Answer №1

To start, you have the option to change an object into JSON by utilizing result.JSON() when sending the response through a service. Once you receive that JSON object, make sure to convert it with this.result=JSON.stringify(result). This method has proven effective for me.

Answer 2

To start, you have the option to change an object into JSON by utilizing result.JSON() when sending the response through a service. Once you receive that JSON object, make sure to convert it with this.result=JSON.stringify(result). This method has proven effective for me.

Answer 3

Answer №2

If you have a variable called data in your component class that needs to be assigned the data from a JSON source, you can use an output property to emit the received data.

You can achieve this by following these steps:

import { Component, Output, EventEmitter } from '@angular/core';

@Component({
  selector: 'user',
  template: '<div>Hi</div>'
})

export class AppComponent{
    data: Data;
    @Output() dataOutput: EventEmitter<Data> = new EventEmitter<Data>();

    this.propertiesService.addSeriesToChart(this.testId).subscribe(result => {
        this.data = result.json();
        this.dataOutput.emit(this.data);
    });
}

The model Data should contain the variables that will map to the JSON data:

export class Data{
   id: number;
   name: string;
}

To use the AppComponent in other parts of your app, you need to bind the event like this:

<user (dataOutput)="receiveData($event)"></user>

 export class PageComponent {
     dataReceived: Data;
     
     constructor(){}
     
     receiveData(data){
         this.dataReceived = data;
     }

     getUIData(value: any) {
          for (var name in value.selected) { 
             if (this.dataReceived != undefined && this.dataReceived != null) { 
                 if (name == 'mark') 
                     // Do something with the data 
             } 
         }
      }
 }

This approach simplifies handling JSON data in your Angular application. Give it a try and see if it fits your requirements.

Answer 4

If you have a variable called data in your component class that needs to be assigned the data from a JSON source, you can use an output property to emit the received data.

You can achieve this by following these steps:

import { Component, Output, EventEmitter } from '@angular/core';

@Component({
  selector: 'user',
  template: '<div>Hi</div>'
})

export class AppComponent{
    data: Data;
    @Output() dataOutput: EventEmitter<Data> = new EventEmitter<Data>();

    this.propertiesService.addSeriesToChart(this.testId).subscribe(result => {
        this.data = result.json();
        this.dataOutput.emit(this.data);
    });
}

The model Data should contain the variables that will map to the JSON data:

export class Data{
   id: number;
   name: string;
}

To use the AppComponent in other parts of your app, you need to bind the event like this:

<user (dataOutput)="receiveData($event)"></user>

 export class PageComponent {
     dataReceived: Data;
     
     constructor(){}
     
     receiveData(data){
         this.dataReceived = data;
     }

     getUIData(value: any) {
          for (var name in value.selected) { 
             if (this.dataReceived != undefined && this.dataReceived != null) { 
                 if (name == 'mark') 
                     // Do something with the data 
             } 
         }
      }
 }

This approach simplifies handling JSON data in your Angular application. Give it a try and see if it fits your requirements.

What is the best way to map JSON object properties to specific values in Typescript?

Answer №1

Answer №2

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