onSubmit script error: TypeError: Cannot read property 'getElementsByTagName' of null

[vallamreddyvenu]

Hi,

In one of our stage environments, one incident is behaving differently. when user click on save/update buttons, the user is getting below error message. It's not allowing the user to perform any action on that page. Below is the error.

I know that disabling the "Simultaneous Update Alert" client script will make it go through. But i don't want to use that as this is not happening on other incident. 

Does somebody know why it occurs and how to solve the issue.

Thanks,

Venu

[vallamreddyvenu]

Thanks Guys.I tried the above. But still that's not working

[Hitoshi Ozawa]

By "not working", does this imply that there's still an error?

My bad on my earlier reply. "+" should have been a "}".

try {
  var updatedOn = gel('onLoad_sys_updated_on');
  if (!updateOn) {
    return;
  }
  updatedOn = updatedOn.value;
} catch (e) {
}

Also, check the source code of the incident page to make sure there is a tag named "onLoad_sys_updated_on". It doesn't seem to be OOTB tag so it may be it was not added to this page. Since it doesn't exist, it may be causing the error.

[vallamreddyvenu]

Hi Hitoshi,

Thanks for assistance. Can you please help to elaborate below line. I couldn't get your point here.

Also, check the source code of the incident page to make sure there is a tag named "onLoad_sys_updated_on". It doesn't seem to be OOTB tag so it may be it was not added to this page. Since it doesn't exist, it may be causing the error. 

Thanks,

Venu

[Hitoshi Ozawa]

Open the incident page in question and right click on the page and select "View page source".

Press Ctrl + F keys to bring up the search box. Enter "onLoad_sys_updated_on". This should highlight all places where "onLoad_sys_updated_on" is in a page. Find if there is a tag with id = "onLoad_sys_updated_on".

gel() is a shorthand notation for getElementById(). If the id doesn't exists, it'll return null.

FYR:

https://www.howtogeek.com/416108/how-to-view-the-html-source-in-google-chrome/