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Support Article

Script error from pega_ui_doc.js as HARNESS_CONTENT is null



User is seeing undefined or null reference Javascript error on one of their portal.

Error Messages

Line: 5
Error: Unable to get property 'scrollHeight' of undefined or null reference

Steps to Reproduce

OnLoad of a stream rule. Error: Unable to get property 'scrollHeight' of undefined or null reference is firing up.

Root Cause

We have found the respective code from where the error is originating.
var hcDivScrollHeight = document.getElementById("HARNESS_CONTENT").scrollHeight;

It is present in pega_ui_doc that is a java script file used by the harness document.

Text File: pega_ui_doc(Final)
webwb • pega_ui_doc • js

There were two places in the Javascript where we are accessing HARNESS_CONTENT and at one of the place, null check was missing.


To resolve this issue, we have to modify resizeActionIFrame API in pega_ui_doc to use hcDiv (that already has a null check) instead of using document.getElementById("HARNESS_CONTENT") again in the same function.

This issue will be resolved in the next Pega7.1 release (ML8).

Published January 31, 2016 - Updated October 8, 2020

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