CODEWITHSUNDEEP
javascriptnode.js
Casper
Casper

Reputation: 1723

How to create a while loop with delay in nodejs

Let's say I have this pseudo code:

var STATUS = '';
while (STATUS !== "SUCCEEDED") {
    STATUS = getStatus();
    anotherFunc();
    delay(3s);
}

The goal of this code is to keep calling an api to check a status of something, the api returns IN_PROGRESS or SUCCEEDED. So I want the while loop to keep calling getStatus() to get the value of STATUS and break the loop when it is SUCCEEDED. I also want to put a delay between each iteration.

This can't be done easily with Nodejs. So please help me out.

Upvotes: 1

Views: 3581

Answers (2)

Kristianmitk
Kristianmitk

Reputation: 4778

you don't even need a while loop for that, simply use setInterval() and within the callback check if your condition is satisfied to clear the created interval.

var STATUS = '',
    idx = setInterval(function() {
        STATUS = getStatus();
        if (STATUS === "SUCCEEDED") { // I guess you wanted a check for STATUS instead of VAR
            return clearInterval(idx);
        }
        anotherFunc();
    }, 3000); // the interval when to call the function again 3000ms = 3sek

Upvotes: 2

DillGromble
DillGromble

Reputation: 383

You can use setInterval to continually do something on a delay. It accepts a function which you can use to do the api call, but before you do the call you should check if the last call was successful.

Once a call is successful you can clear the interval.

https://nodejs.org/api/timers.html#timers_setinterval_callback_delay_args

Upvotes: 0

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