For every piece of information in the reply

Question

For every piece of information in the reply

In the past, my method of working with JSON looked like this:

this.http.get('http://localhost:3000/SumOfDipVolume').subscribe(res => {
  for (let dipVolume of res['result']) {
    // some code
});

However, I have now realized that I no longer want to access the result object, as my JSON structure does not include it. Here is an example of my current JSON file:

[
  {
    "Title": "DYNAMIC DISEL 50PPM",
    "UpValue": "122,196",
    "DownValue": "-148,740.83",
    "Procentage": "45.10%"
  },
  {
    "Title": "DYNAMIC UNLEADED 95",
    "UpValue": "121,905",
    "DownValue": "-285,527.35",
    "Procentage": "29.92%"
  }
]

Now I need to use something like this: for (let dipVolume of res) { but Angular is giving me the error: Type object is not an array type or a string type. How can I iterate through this?

angular typescript

Answer 1

Answer №1

The issue at hand here is related to resolving Typescript type. It has been identified as being of type any, and not an array specifically. Without specifying a type, you will encounter difficulties when attempting to loop over the object.

A solution to this problem is to explicitly define the type.

.subscribe((res: IMyObjectShape[]) => { // Best practice for adding a new interface
//.subscribe((res: any[]) => { //<- Use 'any' if no specific interface is defined
  ... 
})

Answer 2

The issue at hand here is related to resolving Typescript type. It has been identified as being of type any, and not an array specifically. Without specifying a type, you will encounter difficulties when attempting to loop over the object.

A solution to this problem is to explicitly define the type.

.subscribe((res: IMyObjectShape[]) => { // Best practice for adding a new interface
//.subscribe((res: any[]) => { //<- Use 'any' if no specific interface is defined
  ... 
})

Answer 3

Answer №2

The issue here is that all http requests are being received without specifying the content type, causing unnecessary data overhead. To streamline this process and only receive the desired response result, you can modify your code as shown below.

import { HttpClient, HttpHeaders } from '@angular/common/http'; 
...
constructor(private http: HttpClient) { }

serviceApi(){
   let headers = new HttpHeaders();
   headers = headers.set('Content-Type', 'application/json; charset=utf-8');
   return this.http.get('http://localhost:3000/SumOfDipVolume', {headers})
   .subscribe(res => {
       res.forEach(dipVolume =>{
        // add your code logic here
       });
   });          
}

Answer 4

The issue here is that all http requests are being received without specifying the content type, causing unnecessary data overhead. To streamline this process and only receive the desired response result, you can modify your code as shown below.

import { HttpClient, HttpHeaders } from '@angular/common/http'; 
...
constructor(private http: HttpClient) { }

serviceApi(){
   let headers = new HttpHeaders();
   headers = headers.set('Content-Type', 'application/json; charset=utf-8');
   return this.http.get('http://localhost:3000/SumOfDipVolume', {headers})
   .subscribe(res => {
       res.forEach(dipVolume =>{
        // add your code logic here
       });
   });          
}

For every piece of information in the reply

Answer №1

Answer №2

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