Javascript - how to work with the iterator in a for loop with callbacks

Question

I am trying in the for loop to access the value of the i with which the callback function uses.

How can I do this?

for (var i = 0; i < a.length; i         


        

Answer 1

It's because the closure captures the variable i itself, not the current value. Try:

for (var i = 0; i < a.length; i++) (function(i)
{
    calcRoute(fixedLocation, my_cities[i].address, function(response) {

        // i want here to have the current "i" here

    });             

}) (i);

which will create a new i variable for each loop iteration.