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detecting if a visitor is on a mobile device

Posted on 2011-03-23
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Last Modified: 2012-05-11
Hi,

I am struggling to find a definative answer to my question which I know is well used.

Basically I have a flash file on my website.

I want to add some code to my vb.net page that can tell if the user is from a mobile device and if so just make the flash invisible and replace it with an image.

What is the best way to do this so I don't have to worry about specific devices etc like ihpone and so on.....?

Thanks in advance
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Question by:scm0sml
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HyperBPP earned 2000 total points
ID: 35199863
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Author Comment

by:scm0sml
ID: 35199979
ok so if i wanted to do it in code rather than using the webconfig:
context.Request.ServerVariables["HTTP_USER_AGENT"] =

what would i need to check for just to see if it is a mobile device rather than worrying about the manufacturer etc as it is in the code behind that I will need my code to hide the image?
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LVL 6

Expert Comment

by:HyperBPP
ID: 35200362
Surround the Flash content with an "if" statment similar to:

if(isMobileBrowser() = false) then
    <flash stuff here>
end if
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Author Comment

by:scm0sml
ID: 35200509
You're missing my point.

What goes after the = in my previous post?
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LVL 6

Expert Comment

by:HyperBPP
ID: 35200707
You are going to have to loop over several values to find out if the HTTP_USER_AGENT is a mobile device.  I personally would use a HashTable to store the values listed below, and use:

if(hashTableVar.containsKey(context.Request.ServerVariables["HTTP_USER_AGENT"]) = False) then
    ...Flash stuff...
end if


If HTTP_USER_AGENT is equal to any of the following values then it is a mobile device:

“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”, “jb”, “dddi”,
“moto”, “iphone”


This site has a listing of mobile browser user_agent strings:  http://www.zytrax.com/tech/web/mobile_ids.html.

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