Changing global variable value in callback function

Asked Aug 06 '18 at 08:59

Active Aug 07 '18 at 08:58

Viewed 1,336 times

I'm calling function and return data push into an array but array is empty

property.forEach(function(proObj){
  var photo=[];
  proObj.photosId.forEach(function(Pid){
    fileUpload.fetchPhotoById(Pid,function(photoObj){
      photo.push(photoObj); //photo obj is added to photo Array
      console.log('source:-'+photoObj); // getting data correctly
    }) 
  })
  proObj.photos=photo;  
  console.log('Photo Array'+photo); // photo has default value means empty array
})

Please help me anyone to resolve

edited Aug 07 '18 at 08:58

Sunil Chaudhary

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asked Aug 06 '18 at 08:59

veda

1

Possible duplicate of [Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference](https://stackoverflow.com/questions/23667086/why-is-my-variable-unaltered-after-i-modify-it-inside-of-a-function-asynchron) – CertainPerformance Aug 06 '18 at 09:00
i couldn't understand that explaination any simple solution – veda Aug 06 '18 at 09:41
all the functions are async, you can get the result only in callback function ( or use promises or async-await) – Edwin Babu Aug 06 '18 at 10:26
I have used callback but not getting – veda Aug 06 '18 at 12:58
Use let photo = []; – Himanshu Shekhar Aug 07 '18 at 09:06
let also not working – veda Aug 07 '18 at 09:55

Changing global variable value in callback function

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