change webpage


I am sure I have asked this before but I cant find the post.

Say someone has a webpage designed for desktops and decides they want the webpage to work properly  for mobile devices. They want the desktop webpage to be left alone.

What is the script or method to detect a mobile webpage and load a new html/css for tablet/phone size . users will go to the same webpage as the desktop location and be redirected to a mobile version if need be.

This avoids the headache of making a static desktop webpage responsive.
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Scott Fell, EE MVEConnect With a Mentor Developer & EE ModeratorCommented:
Every system to do this has it's flaws and detecting android phone vs tablet is not easy. That is why media queries are the way to go but I understand the learning curve.  

Check out this site to get the script you want in just about any language
jagguyAuthor Commented:
No I dont mean tools to convert I mean a script or something to detect if a table/phone is being used.
I will code using html/css for mobile devices and the desktop website is left alone. There has to be something to redirect to either device.
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for java code to detect the device & change the html...
jagguyAuthor Commented:
I like media queries and this is simple enough. I will code for different size mobile devices with this. Responsive layout is not simple for images on screen and in lists. There are quirks like margin in % and px changes the inline flow.

There is no point changing a desktop webpage if someone doesnt want it changed. I am working around it but not avoiding media queries

I like this solution script but this would mean placing this code in the home page of the desktop website would it? for example the solution uses server side script
Dave BaldwinFixer of ProblemsCommented:
One of my customers whose HTML skills normally date from 1999 found that Dreamweaver CS6 has this built in and almost magically created a 'mobile' version of his site in less than a week.  I was impressed.
Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
That site gives you both serverside and javascript options.    There is going to be a learning curve no matter what you do. I think for small sites responsive seems to be the way to go.  You just need to watch you are not loading too much up at once if using dynamic pages.  For seo the advantage is you are not servering duplicate content.    

When you make a completely different mobile site then desktop, you need to make sure you are not showing google the same content (textual content).  You will just need to be smart about this.  There are gotcha's either way weather you stumble directly on it or not.

However, either choice is a lot easier then creating native mobile.

Also watch that "mobile" has both a small phone and larger tablet.  I think the useragent for android is not easy to distinguish between the two and this is another reason I like responsive.

Good luck.
Dave BaldwinFixer of ProblemsCommented:
For 'detection', I just used javascript to redirect browsers with a screen size of 480 or less in either dimension.  The original site worked fine or at least ok in screens larger than that.
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