Index: lams_central/web/includes/javascript/download.js
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diff -u
--- lams_central/web/includes/javascript/download.js	(revision 0)
+++ lams_central/web/includes/javascript/download.js	(revision a9c37bb00c2d884e63c845b27883eae52d176040)
@@ -0,0 +1,43 @@
+// Helper methods for downloading files
+
+// Download a file using the given URL.
+// If spinnerDiv is set, then displays the spinnerDiv area that should contain a waiting spinner until the file is downloaded
+// If resultsMsgDiv and resultsMsg are set, then displays the resultsMsg in the resultsMsgDiv area
+// If buttonStyle is set then it disables the button with that style until the file is downloaded.
+// Back end must handle "&downloadTokenValue=<token>" on the URL
+// Detecting the file download dialog in the browser: 
+// http://geekswithblogs.net/GruffCode/archive/2010/10/28/detecting-the-file-download-dialog-in-the-browser.aspx
+var fileDownloadCheckTimer;
+function downloadFile(downloadUrl, spinnerDiv, resultsMsg, resultsMsgDiv, buttonStyle) {
+	if ( buttonStyle ) {
+		$('.'+buttonStyle).prop('disabled', true);
+	}
+	if ( resultsMsg && resultsMsgDiv ) {
+		$('#'+resultsMsgDiv).html('');
+	} 
+	if ( spinnerDiv ) {
+		$('#'+spinnerDiv).show();
+	}
+	var token = new Date().getTime(); //use the current timestamp as the token value
+
+	fileDownloadCheckTimer = window.setInterval(function () {
+		var cookieValue = $.cookie('fileDownloadToken');
+		if (cookieValue == token) {
+		    //unBlock export button
+			window.clearInterval(fileDownloadCheckTimer);
+			$.cookie('fileDownloadToken', null); //clears this cookie value
+			if ( spinnerDiv ) {
+				$('#'+spinnerDiv).hide();
+			}
+			if ( resultsMsg && resultsMsgDiv ) {
+				$('#'+resultsMsgDiv).html(resultsMsg);
+			} 
+			if ( buttonStyle ) {
+				$('.'+buttonStyle).prop('disabled', false);
+			}
+		}
+	}, 1000);
+			
+	document.location.href = downloadUrl + '&downloadTokenValue=' + token;
+	return false;
+}
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