With my website I used to work with the two master pages created by default in any new webforms solution (i.e Site.Master & Site.Mobile.Master). I have noticed on firefox for mobile that my mobile master page never get loaded but rather the "normal" master page. With chrome for mobile or other browser everything works fine. I made substantive changes to my solution and now the mobile master page never get loaded by default in any cases (chrome developer tools included). I have done some researches which led me to this solution that works fine with chrome but still returns false with firefox:
protected void Page_PreInit(object sender, EventArgs e)
{
if (Request.Browser.IsMobileDevice)
{
MasterPageFile = "~/Site.Mobile.Master";
}
}
The problem here is that I have to include it in every single aspx page. I have done a lot of researches and must admit that the documentation about it is quite poor. Is not there some settings I can add to the web.config file or some code to add to my global.asax so that I don't have to check the browser in every aspx pages?
Request.Browser.IsMobileDevice is not reliable. The following helper method could detect a little bit more.
If you want reliable detection for every device including new ones, you want to use commercial service such as 51Degrees.
protected void Page_PreInit(object sender, EventArgs e)
{
// *** For debugging, I inverted if statement.
// You can reverse it back after debugging. ****
if (!IsMobileBrowser(HttpContext.Current))
MasterPageFile = "~/Site.Desktop.Master";
else
MasterPageFile = "~/Site.Mobile.Master";
}
public static bool IsMobileBrowser(HttpContext context)
{
// first try built in asp.net check
if (context.Request.Browser.IsMobileDevice)
{
return true;
}
// then try checking for the http_x_wap_profile header
if (context.Request.ServerVariables["HTTP_X_WAP_PROFILE"] != null)
{
return true;
}
// then try checking that http_accept exists and contains wap
if (context.Request.ServerVariables["HTTP_ACCEPT"] != null &&
context.Request.ServerVariables["HTTP_ACCEPT"].ToLower().Contains("wap"))
{
return true;
}
// Finally check the http_user_agent header variable for any one of the following
if (context.Request.ServerVariables["HTTP_USER_AGENT"] != null)
{
// List of all mobile types
string[] mobiles =
new[]
{
"android", "opera mini", "midp", "j2me", "avant", "docomo", "novarra", "palmos", "palmsource",
"240×320", "opwv", "chtml",
"pda", "windows ce", "mmp/", "blackberry", "mib/", "symbian", "wireless", "nokia", "hand", "mobi",
"phone", "cdm", "up.b", "audio", "sie-", "sec-", "samsung", "htc", "mot-", "mitsu", "sagem", "sony",
"alcatel", "lg", "eric", "vx", "nec", "philips", "mmm", "xx", "panasonic", "sharp", "wap", "sch",
"rover", "pocket", "benq", "java", "pt", "pg", "vox", "amoi", "bird", "compal", "kg", "voda",
"sany", "kdd", "dbt", "sendo", "sgh", "gradi", "dddi", "moto", "iphone"
};
// Check if the header contains that text
var userAgent = context.Request.ServerVariables["HTTP_USER_AGENT"].ToLower();
return mobiles.Any(userAgent.Contains);
}
return false;
}