Forum Post: RE: How to fetch logged in username in Javascript

Something like this:

function GetName() {     var odataSelect = Xrm.Page.context.getServerUrl() + "/xrmservices/2011/OrganizationData.svc/SystemUserSet?$select=FullName&$filter=SystemUserId eq guid'" + Xrm.Page.context.getUserId() + "'";     var retrieveReq = new XMLHttpRequest();     retrieveReq.open("GET", odataSelect, false);     retrieveReq.setRequestHeader("Accept", "application/json");     retrieveReq.setRequestHeader("Content-Type", "application/json; charset=utf-8");     retrieveReq.onreadystatechange = function () {         getResult(this);     };     retrieveReq.send(); }  function getResult(retrieveReq) {     if (retrieveReq.readyState == 4) {         if (retrieveReq.status == 200) {             var retrieved = this.parent.JSON.parse(retrieveReq.responseText).d;             var retrievedValue = retrieved.results[0].FullName;             alert(retrievedValue);         }     } }