javascript - Uncaught TypeError: Cannot read property 'HotelInfo' of undefined -

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 //an ajax call api                jquery(document).ready(function() {     jquery.ajax({     url:"http://localhost:8080/activitieswithrealdata?location=%22sea%22&startdate=%2205-14-16%22&enddate=%2205-16-16%22&theme=%22food%22",     datatype: 'json', type: 'get',     success: function (data)     var viewmodel;     if(data) {     viewmodel = new dealspagemodel(data);     var idlist = "";     (var = 0; i< data.packagedeal.length; i++)     {                 if (i == data.packagedeal.length -1)     { idlist += data.packagedeal[i].hotelid;     }                  else     {idlist += data.packagedeal[i].hotelid + ',';     }     }      var searchurl = "http://terminal2.expedia.com/x/hotels?hotelids=" + idlist +      "&apikey=6wev4ksgij5eqhd58o2xtdwvo35lzf2s";      //another call api return hotel specific info                jquery.get(searchurl, function (  )     {      for(var i=0; i<viewmodel.deallist.length; i++)     {     var hotelid = viewmodel.deallist[i].hotelid;      for(var i=0; i<data.hotelinfolist.hotelinfo.length; i++)     {     var url = hotelinfolist.hotelinfo[i].thumbnailurl;     var name = hotelinfolist.hotelinfo[i].name;     }      // hotelid current deal     // loop through hotelinfolist.hotelinfo , find out url hotel idlist    //loop through hotelinfolist.hotelinfo , find out name hotel      viewmodel.deallist.push(new deal(data.packagedeal[i], url, name));     }     ko.applybindings(viewmodel);     });     }     }     })     });

you loop through data.hotelinfolist.hotelinfo operate on hotelinfolist.hotelinfo[i].thumbnailurl. data. @ beginning missing.

also, place data in callback function in jquery.get:

jquery.get(searchurl, function(data){ // …

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