Question

My code is:

var myvarible = "0";

wialon.util.Gis.getLocations(coordsc,function(code,responceval) {
    myvarible = responceval;
})

console.log(myvarible); // output is 0 

How i can fix my problem? I think while it returns response code console.log runs first. please help with my problem.

Answer 1

Assuming that this relies on the geolocation functionality of the browser, you can’t “fix” this problem. It’s in the nature of asynchronous coding.

In your function wialon.util.Gis.getLocations() you pass in a callback. So after the (asynchronous) execution of this call, your callback will be executed.

Meanwhile the rest of your code is executed, which leads to the console.log(myvarible); resulting in a 0.

Change your coding style accordingly and put all code dependent on myvarible in the callback itself or in a function, that is called inside the callback. That way this code is only executed after myvarible is set.

So either:

var myvarible = "0";

wialon.util.Gis.getLocations(coordsc,function(code,responceval){
  myvarible = responceval;

  // here comes code using myvarible
  console.log(myvarible);
});

or

var myvarible = "0";

function doStuff(){
  // here comes code using myvarible
  console.log(myvarible);
};

wialon.util.Gis.getLocations(coordsc,function(code,responceval){
  myvarible = responceval;

  doStuff();
});