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Support Article

window.showModalDialog now deprecated in Chrome 37



The javascript function window.showModalDialog is deprecated in Chrome 37: and soon to be in Firefox: This function is used to show the ShowLogoffTimer html in a new window which disallows the user from doing anything on the page without clicking OK on the modal window.

Error Messages

No error message

Steps to Reproduce

Open PRPC in Chrome 37.

Root Cause

The explanation for this behavior is as follows:

Since most of the issues are affecting the designer studio, there is no plan to back port all these changes to previous releases. The recommendation is to use internet explorer browser when the functionality is needed.

The other option is to down-grade Chrome to version 36 or lower or use the following workaround:



Created a registry file (anything.reg) and paste this:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome\EnableDeprecatedWebPlatformFeatures] "1" = "ShowModalDialog_EffectiveUntil20150430"

Restart Chrome.


Open Terminal

Paste this in: defaults write EnableDeprecatedWebPlatformFeatures -array-add "ShowModalDialog_EffectiveUntil20150430"

Press return Restart Chrome

For more details concerning this topic, refer to the following PDN Article -

Troubleshooting: JavaScript exceptions and certain icons and controls no longer functioning under Chrome -

Suggest Edit

Published January 31, 2016 - Updated October 8, 2020

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