Recent days, I got the same problem. the cause is the windows security updates.
refer to
https://technet.microsoft.com/library/security/2905247[
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You might insert below code, can resolve your issue.
var objForm = document.forms[0]
if (objForm) {
var hid__VIEWSTATE = objForm.elements['__VIEWSTATE'];
var hid__EVENTARGUMENT = objForm.elements['__EVENTARGUMENT'];
var hid__EVENTTARGET = objForm.elements['__EVENTTARGET'];
if (hid__VIEWSTATE) {
hid__VIEWSTATE.disabled = true;
}
if (hid__EVENTARGUMENT) {
hid__EVENTARGUMENT.disabled = true;
}
if (hid__EVENTTARGET) {
hid__EVENTTARGET.disabled = true;
}
}
Reference
http://www.dotblogs.com.tw/rainmaker/archive/2014/09/23/146668.aspx[
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