javascript - String value becomes undefined when trying to concat another string -


i'm working on practicing openweathermap api. have coordinate object keys lat & lon equal string. when pass coord obj function , try concat strings api call string become undefined. thought made scope of these variables global doesn't seem case. can tell me incorrect code 

var apikey = '9575f3355ae129dc91424b5712a7695e'; var coords = {}; var accessowm='';  function mylocation(){        navigator.geolocation.getcurrentposition(function(position)       {     coords.lat = (math.round(position.coords.latitude*100)/100).tostring();     coords.lon = (math.round(position.coords.longitude*100)/100).tostring();   }); }  function changeaccess(coordobj, key){ console.log(coordobj); accessowm ='http://api.openweathermap.org/data/2.5/forecast?lat='+coordobj['lat']+'&lon='+coordobj['lon']+'&appid='+key; }   mylocation(); console.log(coords); changeaccess(coords, apikey); console.log(accessowm);

that's because getcurrentposition method asynchronous. mean getcurrentposition's callback not invoked @ moment of calling changeaccess function. have place changeaccess call getcurrentposition's callback:

function mylocation() {     navigator.geolocation.getcurrentposition(function(position) {         coords.lat = (math.round(position.coords.latitude*100)/100).tostring();         coords.lon = (math.round(position.coords.longitude*100)/100).tostring();     });     changeaccess(coords, apikey); }

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