Ruby on Rails:验证用户在表单上输入单词的次数 [英]Ruby on Rails: Validate the number of times a user enters a word on a form
如何只允许用户在编辑文本中输入合理的身高和体重值? Java [英]How do I only allow the user to enter sensible height and weight values in Edit Text? Java
拒绝字母,只允许数字输入@在 Python 3.x 中输入第一个和第二个数字 [英]Reject letters and only allow number inputs @ enter first and second number in Python 3.x