How to fix Android phone keyboard popup will compress page

Many times in the project we need to use the input box Input,input focus will call the phone keypad, this time we if the current page maximum element width is the actual pixel, it is not a problem, but if the writing is hundred percent on the Android machine on the current page will be compressed upward, But mobile side we have to make adaptive, we can not write a fixed width high, then how to solve, first we could get the current mobile device width and height, and then to the current page write wide, plus position:fixed;

<style>

. page{position:fixed;

left:0;

top:0; }

</style>

var x =document.body.clientwidth;

var y =document.body.clientheight;

$ (". Page"). width (x);

$ (". Page)." Height (y);

How to fix Android phone keyboard popup will compress page