javascript - How to iterate data output from DataSchema XML -

yui().use("datatype-xml", "dataschema-xml", function(y) {     var datain = y.datatype.xml.parse(xmldata);     schema = {         resultlistlocator: "song",         resultfields: [{key:"title"}, {key:"artist"}, {key:"rank"}]     },     dataout = y.dataschema.xml.apply(schema, datain);      console.log(dataout); <-- display list of object     console.log(dataout.length); <--- undefined }); 

everything seems correct when log dataout (a list of object). when try loop through list, length undefined.

so how can iterate through list after applying dataschema.xml ?

dataschema's apply method returns object results , meta properties. results property array can iterate over. here's example:

yui().use("datatype-xml", "dataschema-xml", function(y) {   var data_in = y.datatype.xml.parse('<response><session>542235629</session><tracks  start="1" count="10" total="98" errorcount="0"  defaultsort="popularity+"  description="top 100 tracks"  name="top 100 tracks"  ><track id="59672468" rating="-1" title="i kissed girl"><artist id="30326214" rating="-1">katy perry</artist><iteminfo><chartposition last="26" this="1"/></iteminfo></track><track id="47973564" rating="-1" title="shake it"><artist id="45575683" rating="-1">metro station</artist><iteminfo><chartposition last="27" this="2"/></iteminfo></track><track id="52207363" rating="-1" title="bleeding love"><artist id="37956508" rating="-1">leona lewis</artist><iteminfo><chartposition last="28" this="3"/></iteminfo></track></tracks></response>'),       schema = {         metafields: {           session: "//session", total:"//tracks/@total"         },         resultlistlocator: "//track",         resultfields: [           {key:"song", locator:"@title"},           {key:"artist", locator:"artist"},           {key:"rank", locator:"iteminfo/chartposition/@this"}         ]       },       data_out = y.dataschema.xml.apply(schema, data_in);    y.array.each(data_out.results, function (data) {     // ...   }) });