Could we potentially achieve something similar to this code snippet? I attempted it but didn't have any success:
@Injectable()
class X {
constructor(private http: Http){ // <-- Injection in parent class
}
method(){
this.http.get()...
};
}
@Injectable()
class Y extends X{
anotherMethod() {
this.method();
}
}To correctly implement inheritance in TypeScript, you must remember to call the constructor of the parent class using the super keyword and pass down any necessary dependencies:
@Injectable()
class A {
constructor(private http: Http){ // <-- Injection in root class
}
foo(){
this.http.get()...
};
}
@Injectable()
class B extends A{
constructor(http: Http) {
super(http);
}
bar() {
this.foo();
}
}
For further insights on this topic, check out this discussion.
If you follow these steps, your issue will definitely be resolved.
@Injectable()
class A {
constructor(private http: Http){ // Receives injection in main class
}
foo(http:Http){ // Accepts parameter as type Http
http.get()... // This method is guaranteed to work.
};
}
import {Http} from '@angular/http';
@Injectable()
class B extends A{
constructor(private http:Http){}
bar() {
this.foo(this.http); // Passes this.http as a parameter
}
}
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