Filtering on server by all fields in Ext js?

Question

JavaScript

I still can't figure out filtering in Ext Js.
So far it has happened locally. How to rewrite to send requests to the server with filters?

onFilter: function(field, newValue, oldValue, options){
    var grid = Ext.getCmp('grid');
    grid.store.clearFilter();

    if (newValue) {
        var matcher = new RegExp(Ext.String.escapeRegex(newValue), "i");
        grid.store.filter({
            filterFn: function(record) {
                return matcher.test(record.get('id')) ||
                    matcher.test(record.get('names'));
            }
        });
    }
}