Using Selection Widgets
Mark Murphy · Apress eBooks · 2011
In Chapter 11, you saw how fields could have constraints placed on them to limit possible input, such as numeric-only or phone-number-only. These sorts of constraints help users “get it right” when entering information, particularly on mobile devices with cramped keyboards. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.