Custom action button enable/disable

Question

I want to enable or disable custom Action button on following condition.

When user select list items in the list and if the user (created by) is particular user Group then I want to disable the Button.

How do I do this?

Answer 1

Please run the following javascript script

// The below checks if the user exists in the group
function CheckUser(groupID, isInThisGroup) {

    var context = SP.ClientContext.get_current();
   //Go to parent site if use in a subsite!
    var siteColl = context.get_site();
    web = siteColl.get_rootWeb();
    var groupCollection = web.get_siteGroups();
    // Get the Group's ID
    var _group = groupCollection.getById(groupID); 
    // Get all Users of the group
    var users = _group.get_users();
    context.load(_group);
    context.load(users);
    this._users = users;
    // Get current user
    this._currentUser = web.get_currentUser(); 
    this._isInThisGroup = isInThisGroup;
    context.load(this._currentUser);
    context.executeQueryAsync(Function.createDelegate(this, this.CheckUserSucceeded), Function.createDelegate(this, this.failed));
}

//The below Checks if User is the member of the specified group
function CheckUserSucceeded() {

    if (this._users.get_count() > 0) {
        var _usersEnum = this._users.getEnumerator();
        while (_usersEnum.moveNext()) {
            var user = _usersEnum.get_current();
            if (user.get_loginName() == this._currentUser.get_loginName()) {
                //debugger;
                arrIsInThisGroup[this._isInThisGroup] = true;
            }
        }
    }
}

More information, please refer to this article:

• Sharepoint 2010 - Enable/Disable Ribbon Button with EcmaScript