为什么Rails number_field表单构建器接受浮动值？

Question

I have a rails form builder with number_field as follows:

= f.number_field :integer_value, :step => 1, :class => 'form', :value => obj.value

it generates the html as:

<input class="form" id="people_attributes_232322900500_integer_value" name="people[people_attributes][232322900500][integer_value]" placeholder="" step="1" type="number">

But still it accepts a float value.

params that I gets in server side is as

{........, "integer_value"=>"12123.323"}

Answer 1

You still have to validate the number in the backend, for example:

validates :integer_value,
  :presence => true,
  :numericality => { :only_integer => true, :greater_than => 0, :less_than_or_equal_to  => 100 }

For the input element, add min="0" to limit the values to integers. Still, it is possible for the user to enter a floating point number in all/most browsers.

Answer 2

This is not a due to rails. input type='number' is a HTML5 construct and it provides only number to be provided in this field. It do not restrict user from entering non numeric characters.

Though most of the browser would apply client side validation on this field and when you try to submit a form validation errors would be show. Note: validation error depends completely on browser and browser version

You should apply server side validation on field to be sure that non numeric field is not accepted Check answer provided by zwippie for server side validation

ref link: http://www.w3schools.com/html/tryit.asp?filename=tryhtml_input_number