jQuery Mobile input box. Stop automatic scrolling to bottom of page

jQuery Mobile input box. Stop automatic scrolling to bottom of page

I have page which contains a numeric input box. When this box is touched on an Android device the numeric keypad appears (good) but the page automatically scrolls to the bottom making the input box disappear from view (bad). You can get back to the input box by scrolling back up to it but whenever a number is entered it scrolls to the bottom again.

How can I fix it so that the relevant input box remains in view while the data is being entered?