/// <summary>
/// The magic behind Modernizr-Server
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Page_Load(object sender, EventArgs e)
{
if (Session[_key] != null && !String.IsNullOrEmpty(Session[_key].ToString()))
{
// The Modernizr object is in session and ready to use
dynamic Modernizr = Session[_key];
if (Modernizr != null)
{
// At this point you are ready to test a particular property
// and do something with it
}
else
{
// The Modernizr object cannot be retrieved from session.
//
// A workaround needs to be put here for this case.
// Ex: load a javascript file that checks the modernizr
// capability client-side and does something with it
}
}
else
{
// This is likely a new session...
//
// Check to see if a Modernizr cookie has been set
HttpCookieCollection TheCookies = Request.Cookies;
HttpCookie ModernizrCookie = TheCookies.Get(_key);
if (ModernizrCookie != null)
{
// Build the dynamic object from cookie found on user's machine
dynamic ModernizrDynamic = new ExpandoObject();
string[] FeatureArray = ModernizrCookie.Value.Split('|');
// Feature Array would look something like [ cssgradients:1, draganddrop:0, ....]
string[] FeatureKeyValueArray = new string[2];
foreach (string Feature in FeatureArray)
{
if (!String.IsNullOrWhiteSpace(Feature))
{
FeatureKeyValueArray = Feature.Split(new[] { ':' }, 2);
// FeatureKeyValueArray could be a simply property like [cssgradients,1]
// but it could be a more complicated property like [video,/ogg:1/webm:0/h264:1]
var f = ModernizrDynamic as IDictionary <String, object>;
if (FeatureKeyValueArray[1].StartsWith("/"))
{
dynamic ValueObject = new ExpandoObject();
string[] SubFeatureArray = FeatureKeyValueArray[1].Trim('/').Split('/');
//SubFeatureArray would be [ogg:1,webm:1,h264:1]
foreach (string SubFeature in SubFeatureArray)
{
string[] SubFeatureKeyValueArray = SubFeature.Split(new[] { ':' }, 2);
//SubFeatureKeyValueArray would be [ogg,1]
var v = ValueObject as IDictionary <String, object>;
//change the 0 or 1 to false or true so that boolean logic can be used
v[SubFeatureKeyValueArray[0]] = SubFeatureKeyValueArray[1] == "0" ? false : true;
}
f[FeatureKeyValueArray[0]] = ValueObject;
}
else
{
//change the 0 or 1 to false or true so that boolean logic can be used
f[FeatureKeyValueArray[0]] = FeatureKeyValueArray[1] == "0" ? false : true;
}
}
}
// Store the generated object in session for later use
Session[_key] = ModernizrDynamic;
}
else
{
// No Modernizr cookie exists, so we need to try to create one
if (Session["ModernizrCookieAttempts"] == null)
{
// ModernizrCookie has not been called before during this session
Session["ModernizrCookieAttempts"] = 1;
Response.Redirect("ModernizrCookie.aspx");
}
else
{
// ModernizrCookie has been called before during this session and was
// unsuccessful, or the user cleared their cookies during the session
// AND the session object was also lost. The latter would be unlikely,
// but I guess it's possible...
int CookieAttempts = int.Parse(Session["ModernizrCookieAttempts"].ToString());
if (CookieAttempts <= _MaxCookieAttempts)
{
CookieAttempts++;
Session["ModernizrCookieAttempts"] = CookieAttempts;
Response.Redirect("ModernizrCookie.aspx");
}
else
{
// The application has tried several times (depending on
// the configured "MaxCookieAttempts" variable) during this session
// to set a cookie and has been unsuccessful.
//
// A workaround needs to be put here for these cases.
// Ex: load a javascript file that checks the modernizr
// capability client-side and does something with it
}
}
}
}
}
