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What is the best way to detect a mobile device in JavaScript?

+2 votes
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What is the best way to detect a mobile device in JavaScript? (Sample code would be helpful).

posted May 29, 2017 by Salil Agrawal

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you can use simple javascript to detect it:

if( /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
 // some code..
}

1 Answer

+1 vote

Thanks Mani,

I wanted certain action to be visible to the desktop or bigger screen so used the following code

if(window.innerWidth > 800 || window.innerHeight > 600) {   // Its a case of desktop 
// Desktop code 
}
else {
// Mobile code 
}
answer May 30, 2017 by Salil Agrawal
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+3 votes

I went through this Discussion:

http://stackoverflow.com/questions/7087036/fetching-images-from-server-while-drawing-the-cell

I have a web server server-1.example.com. There is a JSON-Server running on another server server-2.example.com. What I have to achieve is to fetch a list of URLs (in form of JSON response) from server-2 and loop through the urls and fetch them from the server-1. In the meantime i have to animate these images on the browser by Fading the images one after the another.

The algorithm is something like this:-

START:
   FETCH the URLs from server-1 and store them in a cache C
   Loop until C.length
      Fetch first K images by forking a thread.
      animate k images
 END

How can I optimize K? Is my approach right?

+2 votes

I know it is possible via IE (ActiveX objects).
Can we do this with all browsers ? (Specially in FireFox)

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