Adding SP Group to Folder using JSOM in O365

Question

Hi,
Is it possible to add a SharePoint Group to a folder in a Document Library using client side javascript?
We can't use the normal methods because SP.Folder object doesn't have get_roleAssignments() method. I'm looking to run a script from a page within a Script Editor wp to get this done from a button click.
I'm not creating an app but trying to achieve this from an aspx page using a script editor webpart.
PS: I have posted this query to another forum here but haven't got an answer hence thought I'll check with the developer forum
-- The opinions expressed here represent my own and not those of anybody else -- http://manojvnair.blogspot.com

Answer 1

I have cracked it now and here is how we can add SPGroup to a Folder in SharePoint using JSOM:
var rdContribute = currentWeb.get_roleDefinitions().getByName('Contribute');
var collContribute = SP.RoleDefinitionBindingCollection.newObject(clientContext);
collContribute.add(rdContribute);
var myFolder = currentWeb.getFolderByServerRelativeUrl(folderUrl);
var assignments = myFolder.get_listItemAllFields().get_roleAssignments();
var roleAssignmentContribute = assignments.add(mySpGroup, collContribute);
clientContext.load(myFolder);
clientContext.executeQueryAsync(Function.createDelegate(this, this.AddingGroupToFolderSuccess), Function.createDelegate(this, this.AddingGroupToFolderFailed));
Here I'm adding mySpGroup with Contribute rights to folder called folderUrl
-- The opinions expressed here represent my own and not those of anybody else -- http://manojvnair.blogspot.com