How to synchronise Angular http get

0 votes

I can execute a method when the request is completed, but how can i wait till a http get is completed and return the response using in ng2 http?

getAllUser(): Array<UserDTO> {
    this.value = new Array<UserDTO>();
    this.http.get("MY_URL")
                    .map(res => res.json())
                    .subscribe(
                        data => this.value = data,
                        err => console.log(err),
                        () => console.log("Completed")
    );

    return this.value;
} 

the "value" will is null when its returned because get is async..

Sep 8, 2020 in Angular by kartik
• 37,530 points
3,518 views

1 answer to this question.

0 votes

Hello @kartik,

 the only way around this: wrap your call in a while loop with a flag. Don't let the code continue until that flag has "continue" value.

Pseudo code as follows:

let letsContinue = false;

//Call your Async Function
this.myAsyncFunc().subscribe(data => {
   letsContinue = true;
}; 

while (!letsContinue) {
   console.log('... log flooding.. while we wait..a setimeout might be better');
}

Hope it helps!!

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answered Sep 8, 2020 by Niroj
• 82,900 points

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