OnReadyStateChange Scoping Problem

Question

Ich versuche, den Wert GetURL in der New_Token Funktion wieder aus der Funktion zu bekommen, so dass ich es verwenden kann. Ich denke mein Problem ist die request.onreadystatechange Linie (obwohl ich nicht sicher sein kann). GetURL ist außerhalb der Funktion nicht definiert.

var GetURL; 
var request = new XMLHttpRequest(); 
var path="https://ops.epo.org/3.1/auth/accesstoken"; 

request.onreadystatechange= function() {New_Token(GetURL);}; 

var encodedData = window.btoa("key:secret"); //encode consumer key and secret key 
request.open("POST", path, true); 
request.setRequestHeader("Authorization", encodedData); 
request.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); 
request.send('grant_type=client_credentials'); //send request to server, must include grant_type in payload or it won't work 
alert(GetURL); 

function New_Token(GetURL) { 
    if (request.readyState == "4") //Request finished and response is ready 
    { 
     if (request.status == "200") { 
      console.log(request.responseText); 
      var TheResponse = JSON.parse(request.responseText); 
      console.log(TheResponse); 
      var TokenValue = TheResponse.access_token; 
      console.log(TokenValue); 
      GetURL = ("?access_token=" + TokenValue); 
      console.log(GetURL); //this is the added string that needs to be concact. on to ALL OPS calls 

      return(GetURL); 
     } 
     else { 
      alert("Problem retrieving data"); 
      console.log(request.responseText); 
     } 
    } 
} 

Answer 1

Versuchen Sie, diese

function New_Token(GetURL) { 
    if (request.readyState == 4 || request.readyState == "complete") 
    { 
     if (request.status == 200||request.status == 0) { 
      console.log(request.responseText); 
      var TheResponse = JSON.parse(request.responseText); 
      console.log(TheResponse); 
      var TokenValue = TheResponse.access_token; 
      console.log(TokenValue); 
      GetURL = ("?access_token=" + TokenValue); 
      console.log(GetURL); //this is the added string that needs to be concact. on to ALL OPS calls 
      return(GetURL); 
     } 
     else { 
      alert("Problem retrieving data"); 
      console.log(request.responseText); 
     } 
    } 
}