Update SharePoint Apps issue

Question

I've tried to update SharePoint hosted app to a new version. It works great on SharePoint on-premises, but on SharePoint online I have a strange behavior - I've got the error

There was a problem accessing the file system on the server. Details: The URL of Custom Actions deployed by apps may not contain javascript or data URI.

In custom action of the app I have this handler

<CommandUIHandler Command="assembly.AssignToMe.Button.Command"
          CommandAction="javascript: CustomAction.assignToCurrentUser();"
          EnabledScript="javascript: CustomAction.enableDisableAssignToCurrentUser();">
</CommandUIHandler>

I've tried to remove the custom action from a new version, but I've got the same exception.

How can I solve this issue?

Answer 1

According to MSDN (search for CustomAction on page) you are not allowed to put Javascript in a CommandAction, only URLs are expected there, this is how the App model works. However it does work with SharePoint on-premise.

• CustomAction cannot contain JavaScript:
  

  • Any UrlActions or CommandActions must be a URL to navigate to. The URL can be parameterized with normal custom actions tokens in addition to the app-specific tokens.
  • EnabledScript is not allowed in ribbon customizations

You can have your action open a modal and then execute your code in the modal.

Hope this helps

Answer 2

Since your Custom Action is on the app web, I think that there is a problem in your update markup. It is not actually changing the Custom Action, so the old Custom Action is still there. Please see this MSDN article: How to: Update app web components in SharePoint 2013

Answer 3

As it turned out, you still can add custom action with JavaScript in CommandAction and with EnabledScript attribute using JSOM or SSOM. Check this example, it works for me.