Enabling/Disabling "New Activity" ribbon button based on an attribute value of the record with a custom Javascript function and Ribbon Workbench (CRM 2011)

We have had the need to enable or disable the "New Activity" button on the ribbon of the Incident entity based on the value of a record attribute.
We were inspired from an answer on a similar question on the Microsoft social community. We have followed this solution as base and extended it with a custom Javascript function to achieve our purposes.
The question and answers mentioned above are at the following URL:
http://social.microsoft.com/Forums/en-US/a5a0666f-8a07-4b25-92a3-e36ce8861d04/crm-2011-how-to-disable-the-new-activity-ribbon-button-for-a-deactivated-custom-entity
This solution allow the enabling/disabling based on the status of the record (Active / Inactive).

First of all we have developed the Javascript function similar the following:

function addNewActivityEnableRule() {

    //Retrieve the parent window Page object

    var parentPage = document.parentWindow.parent.Xrm.Page;

    //Gets the desired attribute of the parent window page

    var parentPageAttribute = parentPage.getAttribute('parentPage_attributeName');

    //Check if attribute exists

    if (parentPageAttribute) {
      //Get the value of the attribute

        var parentPageAttributeValue = parentPageAttribute.getValue();

        //'value_for_enabling' : replace with the desired value
          (or extend the condition as needed)

        //Return true for the conditions where you want enable
          the ribbon button and false otherwise

        if (parentPageAttributeValue == 'value_for_enabling') {

            return true;

        } else {

            return false;

        }

    }

}

Our solution consists of the following steps:
1. Create a solution with the ‘Activity’ entity in it
2. Open the Solution in the Ribbon Workbench
3. Select 'Activity' entity (activitypointer)
4. Select the 'SubGrid' ribbon in the top right drop down
5. Select the 'New {0}' button and right-click -> Customise Command. Don’t select 'Customise Button'!

 

6. In the 'Solution Elements', expand the 'Display Rules' and for each display rule, set the 'IsCore' property to 'True' since we don’t want to customise these – only the command.
7. In the 'Solution Elements', expand the 'Commands' and select the 'Mscrm.NewRecordFromGrid' command and Right-Click ->'Edit Enable Rules'
8. Click 'Add New' and then 'Add Step'. Select a 'Custom Javascript Rule'

 

9. Set the properties:
      1. InvertResult: False
      2. Default: False

10. Provide the function name and the web resource script library where the function resides
11. Click 'Publish Solution'


Hope it can be useful
Happy CRM coding

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