How to make synchronous chain call with Angular 2?

Question

I have an action1 and action2 methods. action1 method creates a project structure and action2 method fills this structure with data. So first I need to call action1 and when it completes I need to call action2.

Is there any way to make synchronous chain call?

startPoint(){

    action1();
    action2();

}



action1(){
   //create a project structure
   return "completed";
}

action2(){
   //fill project structure with data
   return "completed";
}

Answer 1

To give you an example.

action1() {
    return new Promise((resolve, reject) => {
        // do something
        resolve(<your return value>);
    });
}
action2() {
    // Do something
}

action1().then((res) => {
    action2();
}).catch(() => {
    // error case when reject is called
});

Alternatively you could just return Promise.resolve(<value>); in action1 and you can also use the reject() method in your promise in case of an error.