summing_items_totals_on_match.xml

<?xml version="1.0" encoding="UTF-8"?>
<table xmlns="http://query.yahooapis.com/v1/schema/table.xsd">
    <meta>
        <author>Paul Daniel (hapdaniel)</author>
		<description>Sum of specified elements over items. Returns totals only</description>
        <documentationURL></documentationURL>
    </meta>
    <bindings>
        <select itemPath="" produces="XML">
            <urls>
                <url></url>
            </urls>
            <inputs>
                <key id="data" type="xs:string" paramType="variable" required="true"/>
                <key id="eles" type="xs:string" paramType="variable" required="false"/>
            </inputs>

            <execute><![CDATA[
            y.include("http://hapdaniel.pwp.blueyonder.co.uk/pdaniel/yql/json2.js");

            var fields = eles.split(",");
            var arr_len = fields.length;
            var sums = new Array();
            var totals = new Object;
			var output = new Object;
			item=0;
			for (var i = 0; i < arr_len; i++) {
             totals[fields[i]] = 0;
             }
			totals["yql_match"] = "";
			 
            var pdata = JSON.parse(data);
            
			var match_key = pdata.items[0].yql_match;
			
            for (var j = 0; j < pdata.items.length; j++) {
              if (pdata.items[j].yql_match == match_key) {
			  for (var i = 0; i < arr_len; i++) {
                     ele = "pdata.items[" + j + "]." + fields[i];
                     totals[fields[i]] += Number(eval(ele)); 

                }}
			  else {
			    totals["yql_match"] = match_key;
				match_key = pdata.items[j].yql_match;
				for (var i = 0; i < arr_len; i++) {
                  totals[fields[i]] = totals[fields[i]].toString(); 

                }
				sums.push(totals);
				for (var i = 0; i < arr_len; i++) {
                  totals[fields[i]] = 0; 
				
			  }
            }
			}
             
            //totals.yql_count = pdata.items.length;
            //pdata.items.push(totals);
            //output = JSON.stringify(sums);
            response.object = y.jsonToXml(sums);
            ]]>
            </execute>
        </select>

     </bindings>
</table>