web scraping - CasperJS unable to scrape AJAX webpage -

i trying scrape http://www.snapdeal.com/offers/deal-of-the-day loads json data using ajax call below page:

json_url = http://www.snapdeal.com/json/getproductbyid?* 

the code block using below, log message waiting ajax request:, not waiting ajax request:, instead waitforresource times out

casper.options.onresourcerequested = function (casper, requestdata){     // loop through our ajax urls     // create list of ajax urls track     var ajaxurls = [json_url];      ajaxurls.every(function(ajaxurl){         // request match ajax url         if(requestdata.url.indexof(ajaxurl) !== -1){             // matches, we'll wait return (with 10s timeout)             //console.log("waiting ajax request: " + requestdata.url);             // print_object(requestdata);             casper.waitforresource(requestdata.url, function(){                 console.log("ajax request returned: " + requestdata.url);             }, function(){                 console.log("ajax request didn't return after wait period: " + requestdata.url)             }, 10000);         }     }); } 

to further debug, logged events , resource @ url json_url received, not sure why waitforresource times out.

casper.on('resource.received', function(resource) {     if (resource.url.indexof('http://www.snapdeal.com/json/getproductbyid') != -1){         casper.echo('resource.received: ' + resource.url);      }  }); 

log after run:

waiting ajax request: http://www.snapdeal.com/json/getproductbyid?pogids=671556289429,649272180,60998,685755068805,677649317861,1239888775,661402031482,636966047361,1775140628,1822452791,439536 ,range,2042952975,1472100667,899358889,643129681532,668235859588,&lang=en  resource.received: http://www.snapdeal.com/json/getproductbyid?pogids=671556289429,649272180,60998,685755068805,677649317861,1239888775,661402031482,636966047361,1775140628,1822452791,439536,range, 2042952975,1472100667,899358889,643129681532,668235859588,&lang=en  resource.received: http://www.snapdeal.com/json/getproductbyid?pogids=671556289429,649272180,60998,685755068805,677649317861,1239888775,661402031482,636966047361,1775140628,1822452791,439536,range, 2042952975,1472100667,899358889,643129681532,668235859588,&lang=en  ajax request didn't return after wait period: http://www.snapdeal.com/json/getproductbyid?pogids=671556289429,649272180,60998,685755068805,677649317861,1239888775,661402031482,636966047361,17751406 28,1822452791,439536,range,2042952975,1472100667,899358889,643129681532,668235859588,&lang=en got page no offeres found thestartin: ~/appli 

what need is:

casper.waitforselector() 

or

casper.waitfor(function() {     // test here return true when page loaded })