javascript using formcontext in dynamics 365

function OnLoad() {
// グローバルコンテキストのユーザ設定情報を取得
var userSettings = Xrm.Utility.getGlobalContext().userSettings;
// ユーザ名を取得して表示
var userName = document.getElementById("userName");
userName.innerHTML = "ユーザ名は " + userSettings.userName + " です。";
// ユーザIDを取得して表示
var userId = document.getElementById("userId");
userId.innerHTML = "ユーザIDは " + userSettings.userId + " です。";
}

/*

• ログインユーザー情報取得

*/
function GetUserInfo() {
debugger;
var result = new Array();
var loggedInUserId = Xrm.Utility.getGlobalContext().userSettings.userId;
loggedInUserId = loggedInUserId.replace('{', '').replace('}', '');
var globalContext = Xrm.Utility.getGlobalContext();
var globalUrl = globalContext.getClientUrl();
var req = new XMLHttpRequest();
req.open("GET", globalUrl + "/api/data/v9.1/systemusers(" + loggedInUserId + ")?$select=new_system_executive,internalemailaddress,fullname,firstname,lastname", false);
req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
req.setRequestHeader("Accept", "application/json");
req.setRequestHeader("OData-MaxVersion", "4.0");
req.setRequestHeader("OData-Version", "4.0");
req.onreadystatechange = function () {
if (this.readyState === 4) {
req.onreadystatechange = null;
if (this.status === 200) {
var data = JSON.parse(this.response);
result[0] = data.new_system_executive;
result[1] = data.internalemailaddress;
result[2] = data.fullname;
result[3] = data.firstname;
result[4] = data.lastname;
} else {
Xrm.Utility.alertDialog(this.statusText);
}
}
};
req.send();

return result;

}

===================================

***********LookUp項目取得、設定する
/

• エンティティのOnLoadイベントに追加します。

• @para: formContext コンテキスト
  */
  function OnLoad(executionContextObj) {
  debugger;
  var formContext = executionContextObj.getFormContext();
  var loginUserId = Xrm.Utility.getGlobalContext().userSettings.userId;
  loginUserId = loginUserId.replace('{', '').replace('}', '');
  var loginName = Xrm.Utility.getGlobalContext().userSettings.userName;

  var systemUserLookUp = new Array();
  systemUserLookUp[0] = new Object();
  systemUserLookUp[0].id = loginUserId;
  systemUserLookUp[0].name = loginName;
  systemUserLookUp[0].entityType = "systemuser";

  formContext.getAttribute("new_field_name").setValue(systemUserLookUp);

  var filedLabel, filedId, entityType, lookupFieldObject;
  lookupFieldObject = formContext.getAttribute("new_lookup_user");
  if (lookupFieldObject != null) {
  if (lookupFieldObject.getValue() != null) {
  filedLabel = lookupFieldObject.getValue()[0].name;
  filedId = lookupFieldObject.getValue()[0].Id;
  entityType = lookupFieldObject.getValue()[0].entityType;
  }
  }

}