无法获取未定义或空引用IE11的属性“值”

Question

我有一个代码在ie8中工作正常，但在ie11中它给了我错误 - “无法获取未定义或空引用的属性'值”在调试时。我只是添加了一部分功能。如果你发现它对isSpanish上的其他元素工作正常，那就失败了。欢迎任何建议。

 function callSchedule() {

document.getElementById("hideCallbackRow").style.display = "block";
document.getElementById("scheduleCallBtn").disabled = true; 
var callbackDate = '';
var callbackCallTimeZone = '';
var callbackCallTime = '';
var spanish = '';
if(document.getElementById("fromDate1") && document.getElementById("requestedCallTimeZoneSelectedVal") && document.getElementById("requestedCallTimeSelectedVal")){
setCallbackValues();
callbackDate = document.getElementById("fromDate1").value;
callbackCallTimeZone = document.getElementById  ("requestedCallTimeZoneSelectedVal").value;
callbackCallTime = document.getElementById("requestedCallTimeSelectedVal").value;
spanish = document.getElementById("isSpanish").value;