Add viewport column to voter table, add setViewPort function in javascript.

DesignSurvey/Voter.php

@@ -17,6 +17,7 @@ class DesignSurvey_Voter extends DB_DataObject
     var $ip;                              // string(15)  not_null
     var $step;                            // int(10)  unsigned
     var $prototype_order;                 // blob(16777215)  blob
+    var $viewport;                        // string(50)
     var $submitdatetime;                  // datetime(19)  
 
     /* ZE2 compatibility trick*/

database/designsurvey.sql

@@ -212,6 +212,7 @@ CREATE TABLE IF NOT EXISTS `voter` (
   `ip` varchar(15) NOT NULL default '',
   `step` int(10) unsigned default NULL,
   `prototype_order` mediumtext,
+  `viewport` varchar(50) default NULL,
   `submitdatetime` datetime default NULL,
   PRIMARY KEY  (`id`),
   KEY `ip` (`ip`)

voting_system.js

@@ -210,4 +210,26 @@ function setQuestionRating(qid,value)
 	input = document.getElementById('rq_'+qid);
 	input.value = value;
 }
+function setViewPort()
+{
+	var viewportwidth;
+	var viewportheight;
+
+	if (typeof window.innerWidth != 'undefined') {
+		// the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
+		viewportwidth = window.innerWidth,
+		viewportheight = window.innerHeight
+	} else if (typeof document.documentElement != 'undefined'
+			&& typeof document.documentElement.clientWidth != 'undefined'
+			&& document.documentElement.clientWidth != 0) {
+		// IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
+		viewportwidth = document.documentElement.clientWidth,
+		viewportheight = document.documentElement.clientHeight
+	} else {
+		// older versions of IE
+		viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
+		viewportheight = document.getElementsByTagName('body')[0].clientHeight
+	}
+
+}