how to use angular subscribe function?-CodePudding

I created a service in angular named UserService, and a function in app.componenet.ts that invites it. Here is the code in the UserServer:

//login function in the UserService – gets user's id and returns his name
Login(userId: string):Observable<string>
  {
    let headers=new Headers({'Content-type':'application/json;charset=utf-8'});
    return this.http.get<string>(`${this.url}/login/${userId}`);
  }

and this is the function in the app.componenet.ts:

 Login()
 {
  this.userService.Login(this.userID).subscribe(n=>{
    alert('your name is' n)
  });
 }

The problem is that the Login function in the componenet doesn't enter the subscribe function. It enters the Login function in the Service but not to the subscribe. What should I do?

I followed the code with debugger and didnt see anything strange

CodePudding user response：

Login(userId):Observable<any>{
    return this.http.get(`${this.url}/login/${userId}`);

}

on your app component

Login(){
   this.userService.Login(this.userID).subscribe(n=>{
       alert('your name is' n)
   });
}

if you have no other problems in your code it should work

in case it doesn't work you can do a try catch and show us the error

Login(){
   try{
      this.userService.Login(this.userID).subscribe(n=>{
         alert('your name is' n)
      });
   }catch(error) console.log(error)
   
}

CodePudding user response：

I don't see an issue with the code in itself. Here's a simple implementation using a subscribe with a get method.

Make sure your get works properly