How do you create a custom activity in CRM 2011 using JavaScript?

Question

I've tried this:

function CreateCustomActivity(oDataPath, oDataSetName, subject, entityId, entityTypeCode) {    
    var customactivity = new Object();
    customactivity.subject = subject;
    customactivity.regardingobjectid = entityId;
    customactivity.activitytypecode = entityTypeCode;

    var jsonCustomActivity = JSON.stringify(customactivity);

    var req = new XMLHttpRequest();
    req.open("POST", oDataPath + "/" + oDataSetName, false);
    req.setRequestHeader("Accept", "application/json");
    req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
    req.send(jsonCustomActivity);
}

however, I get the following error:

Error processing request stream. The property name 'subject' specified for type 'Microsoft.Crm.Sdk.Data.Services.new_customactivity' is not valid.

The first property I add to the customactivity object is referenced in the error message. I get the same message when I add regardingobjectid first.

Answer 1

Try creating your activity object with the following notation:

var customactivity = {
    Subject: subject,
    RegardingObjectId: {
        Id: entityId,
        LogicalName: entityLogicalName
    }        
};

Also, I'm not sure off hand but the property names may be case sensitive.