如何在RoR中的number_field中设置最大和最小长度

Question

<label class="control-label">count</label>
<%= f.number_field :count, {:placeholder => "Count", :class => "multiple_text_field form-control", :required => true, :max=>"8",:min=>"8" } %>

Answer 1

如果您想要精确的8位数字，则min值为10000000，max值为99999999。

Answer 2

是的，你几乎已经完成了。对此有一点改变：

<%= f.number_field :count, {:placeholder => "Count", :class => "multiple_text_field form-control", :required => true, max: 8, min: 8 } %>

Answer 3

<%= f.number_field :count, max: 10, min:4 %>

Answer 4

试试这个：

<%= f.text_field :title, class: "form-control", title: "Enter title length 50 characters", placeholder: "Enter Title", :required => true,:maxlength => 50, pattern: ".{1,50}"  %>