验证输入文本轨道

Question

如何使文本字段只接受滑轨中的字母，通过键盘输入数字并且不反映在输入中。对于服务器 I'm使用客户端验证

Answer 1

validates_format_of :atr, :table, :with => /^[a-z]+$/i 

/^ [A-Z] + $/I 将仅仅允许字母。以下是正则表达式的细节。

https://apidock.com/rails/ActiveModel/Validations/HelperMethods/validates_format_of

^  => Start of line 
[a-z] => Any single character in the range a-z 
+  => One or more characters of the range 
$  => End of line 
i  => To make case insensitive