How to callback function in set timeout node js

Question

I have to call a function with the callback in set timeout for that I have written code like this

getData(a, b, function(err, rlt) {
    if (err) {
        console.log(err)
    } else {
        // call next function after 35 seconds 
        settimeout(getData(c, d, function(err, rlt) {
            if (err) {
                console.log(err)
            } else {
                // call next function after 10 seconds
                settimeout(getData(x, y, function(err, rlt) {
                    if (err) {
                        console.log(err)
                    } else {
                        console.log(rlt);
                    }
                }), 10000);
            }
        }), 35000)
    }
});


function getData(parms1, parms2;, callback) {
    return callback(null, parms1 + parms2);
}

I have written code similar to this but my problem is that set timeout not working its execute function immediately not wait for 35 seconds and 10 seconds.

I don't know what wrong I am doing and if you know any better way to do please help me.

function getData(parms1, parms2;, callback) { return parms1 + parms2; } is this correct? — NullPointer
– NullPointer, Commented Jul 19, 2018 at 3:34
@NullPointer sorry my bad i forgot to put callback over there i just updated my question — Dexter
– Dexter, Commented Jul 19, 2018 at 3:37
Just curious... have you considered using Promise or async await instead of setTimeout? The code you have shared is fragile and a good example of callback hell. — samurai_jane
– samurai_jane, Commented Jul 19, 2018 at 3:40
I know to do all these thing with async but it want to execute other function after sometime not immediately — Dexter
– Dexter, Commented Jul 19, 2018 at 3:44

felixbuenemann · Accepted Answer · 2018-07-19 03:44:15Z

1

You must wrap your calls to getData in an anonymous function, e.g. setTimeout(function(){ getData(x, y, …) }, 1000).

edited Jul 19, 2018 at 3:44

answered Jul 19, 2018 at 3:35

felixbuenemann

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2 Comments

Dexter Over a year ago

thax its worked..but if konw better way please tell me i want to avoid this callback hell

felixbuenemann Over a year ago

Maybe Taming Timeouts with a Promise is helpful.

NullPointer · Accepted Answer · 2018-07-19 03:46:31Z

1

Below is the correct syntax for setTimeout.Your method should be always as a first argument of setTimeout function

setTimeout(function(){myMethod(parameter);},3000);

Full Reference: http://www.java2s.com/Tutorials/Javascript/Node.js_Tutorial/0270__Node.js_setTimeout_setInterval.htm

answered Jul 19, 2018 at 3:46

NullPointer

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1 Comment

Dexter Over a year ago

thax its worked..but if konw better way please tell me i want to avoid this callback hell

Rahul Dapke · Accepted Answer · 2018-07-19 04:12:48Z

0

I think you miss spell of settimeout(setTimeout) Try this code:

 var callback = function (err, res) {
        if(err){
           console.log (err);
        }else{
              setTimeout(function() {
                 callback()
                 console.log ("start callback function");
                 }, 10000)
        }
    };

answered Jul 19, 2018 at 4:12

Rahul Dapke

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