Change user status when online with websockets (php Ratchet)

Question

I’m making a chat using websockets with Ratchet, and I have a question regarding the user status.

I made the page upload a list of all the contacts that the user has, and when the server receives a connection from a user I do a search in this contact list by the user who just signed in doing the following:

Onmessage event:

conn.onmessage = function (event) {
    //console.log(event);

    var package = JSON.parse(event.data);

    if (package.type == 'message') {
    dialog_output(package);
    } else if (package.type == 'userlist') {
    users_output(package.users);
    }
};

Function that changes status color:

    function users_output(users) {

    for (var i in users) {

    if (users.hasOwnProperty(i)) {
        var user = users[i];

        user_list.find('li').each(function(i){
            if($(this).attr("data-id") == user.id){
                $(this).css("color", "rgb(50, 250, 0)");
            }else{
                $(this).css("color", "#000");
            }
        });

    }
    }
}

It’s working that way, but I was wondering if it’s the right thing to do? Because it occurred to me that regardless of whether the new user who just logged in is or is not logged in, he will still compare it to the contact list.