Get only receive items in the item receipt

This code will help to get only selected items from the item receipt before submit context from the item sublist.

    /**
     * @NApiVersion 2.x
     * @NScriptType UserEventScript
     * @NModuleScope SameAccount
     */
    define([ 'N/record'],

        function(record) {
            var main = {
                beforeSubmit: function(scriptContext) {
                    if (scriptContext.type == "create" || scriptContext.type == "edit") {
                        log.debug("scriptContext.type ", scriptContext.type);
                        var records = scriptContext.newRecord;
                        var itemadjustment = {};
                        itemadjustment.type = records.type;
                        itemadjustment.itemdetails = main.gettheitems(records, records.type);
                     
                },
                gettheitems: function(recid, rectype) {
                    //log.debug("recid ", recid);
                    log.debug("rectype ", rectype);
                    var loadrec = recid;
                    var Tranid = loadrec.getValue({
                        fieldId: 'tranid'
                    });
                    
                    if (rectype == "itemreceipt") {
                        var sublisttype = "item";
                        var numLines = loadrec.getLineCount({
                            sublistId: sublisttype
                        });
                    } 

                    var itemLocationObj={};
                    for (var i = 0; i < numLines; i++) {
                        var  itemLocation =loadrec.getSublistValue({
                            sublistId: sublisttype,
                            fieldId: 'location',
                            line: i
                        });
                      var  quantRecived =loadrec.getSublistValue({
                            sublistId: sublisttype,
                            fieldId: 'itemreceive',
                            line: i
                        });
                        if(quantRecived == true){
                         
                         if(!itemLocationObj[itemLocation])
                        itemLocationObj[itemLocation]=[];
                         itemLocationObj[itemLocation].push(loadrec.getSublistValue({ sublistId: sublisttype,fieldId: 'item',line: i}))
                       }
                        
                        
                    }

                    
                    log.debug("itemLocationObj",itemLocationObj)

                    return {
                        recdataarray: itemLocationObj,
                        Tranid: Tranid
                    }
                },
               
            };
            for (var key in main) {
                if (typeof main[key] === 'function') {
                    main[key] = trycatch(main[key], key);
                }
            }

            function trycatch(myfunction, key) {
                return function() {
                    try {
                        return myfunction.apply(this, arguments);
                    } catch (e) {
                        log.debug("e in  " + key, e);
                    }
                }
            };
            return main;
        });