I tried almost everything. A script count how many users are in group. I must find out how open this script on page load and upgrade reload. here is this script:
<script>
var userCollection;
var clientContext = new SP.ClientContext();
//Get all groups in site
var groupCollection = clientContext.get_web().get_siteGroups();
// Get the group by name
group = groupCollection.getByName('Sharepoint Group');
//Get all SP Users in SP Group
userCollection = group.get_users();
clientContext.load(userCollection);
//Execute Query
clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded1), Function.createDelegate(this, this.onQueryFailed));
function onQuerySucceeded1() {
alert(userCollection.get_count());
document.getElementById("count").innerHTML=userCollection.get_count();
}
function onQueryFailed(sender, args) {
alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}
</script>