javascript - firebase how to query on firebase-util -

i want filter data firebase, im using firebase-util scroll scrolling,

i have following code

var baseref = new firebase(urltofirebasedata).orderbychild("name").equalto("john_doe"); var scrollref = new firebase.util.scroll(baseref, '$priority');  // establish event listener firebase ref scrollref.on('child_added', function(record) {     console.log('added child', record); }); 

this gives me error

error: first argument firebase.util.scroll must valid firebase ref. cannot query (e.g. have called orderbychild()).require.18.r.scroll 

how can query using firebase-util, have tried putting query in different places no avail

the error message pretty explicit:

first argument firebase.util.scroll must valid firebase ref. cannot query

the reason firebase.util.scroll needs build own query able implement scrolling on location , firebase handles 1 query per location.

if want use firebase.util.scroll scrolling, you'll have separate data out own location can like:

var baseref = new firebase(urltofirebasedata).child("users_items").child("john_doe"); var scrollref = new firebase.util.scroll(baseref, '$priority');