iPad HTML Focus

Unfortunately, focusing is not possible with the iPad. The only way the focus will be placed in the desired field is when the user 'clicks' on the desired field.

Update 2015-01-08:

As explained in this answer by Matt:

... iOS will only allow focus to be triggered on other elements, from within a function, if the first function in the call stack was triggered by a non-programmatic event. In your case, the call to setTimeout starts a new call stack, and the security mechanism kicks in to prevent you from setting focus on the input.