Limit number of files to upload in Filemanager

Webix JS
#1

Is there a way I can limit the number of files the user can upload?
For instance, I would like to let the user to upload 10 files at a time, and if they select more than 10, pop up a message and prevent the uploading process.

#2 
{
    on: {
        onBeforeFileAdd: function() {
            if (this.files.count()>=10)return false;
        }
    }
}

https://docs.webix.com/api__ui.uploader_onbeforefileadd_event.html

#3

Thanks for your answer! @integral
The problem with this aproach is that it will still upload the first 10 files and drop the rest.
I would like to let the user know that there’s a limit and let them choose again which files are gonna be uploaded.
So far I found a hacky way to get the input element that the uploader uses and get the length from it. But I wonder if there’s a more elegant solution.

thanks again!!!