Untitled

//  JSP file returned from backend
<html>
<body>
<textarea>
${errors}
</textarea>
</body>
</html>

// js iframe posting.


function ioIframeGetJson(postUrl){

	var td = dojo.io.iframe.send({

		url: postUrl,
		form: "importForm",
		method: "post",
		content: {
			name: "uploadedfile" // file name in the form
		},
		timeoutSeconds: 20,
		preventCache: true,
		handleAs: "json",
		handle: function(res){
			if(res.$errors) {
				alert("SUCCESS");
			} else
				alert('Error1');
		},
		error: function (res) {
				alert('Error2');
			   }
	});
}