How to return variable from anonymous function

Question

I need to return a variable from a function with anonymous functions inside of it.

Like this:

function resize(f) {

    ...

    reader.onloadend = function() {
     ...

      image.onload = function() {
       ...
        finalFile = dataURItoBlob(canvas.toDataURL(fileType));
      }
    }

}

I need to return the variable finalFile to another variable that called this function, but it keeps returning null, even if I set Global variable it doesn't work. Any idea?

Are you checking the variable before it has been set by that async operation? — Evan Davis
– Evan Davis, Commented Nov 18, 2013 at 21:17

qwertynl · Accepted Answer · 2013-11-18 21:22:07Z

1

onload and functions like it are asynchronous and need callback functions.

You cannot return from them.

answered Nov 18, 2013 at 21:22

qwertynl

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