method

hidden_field_tag

rails latest stable - Class: ActionView::Helpers::FormTagHelper

hidden_field_tag(name, value = nil, options = {})

public

Creates a hidden form input field used to transmit data that would be lost due to HTTP’s statelessness or data that should be hidden from the user.

Options

Creates standard HTML attributes for the tag.

Examples

hidden_field_tag 'tags_list'
# => <input type="hidden" name="tags_list" id="tags_list" autocomplete="off" />

hidden_field_tag 'token', 'VUBJKB23UIVI1UU1VOBVI@'
# => <input type="hidden" name="token" id="token" value="VUBJKB23UIVI1UU1VOBVI@" autocomplete="off" />

hidden_field_tag 'collected_input', '', onchange: "alert('Input collected!')"
# => <input type="hidden" name="collected_input" id="collected_input"
     value="" onchange="alert('Input collected!')" autocomplete="off" />

# File actionview/lib/action_view/helpers/form_tag_helper.rb, line 308
      def hidden_field_tag(name, value = nil, options = {})
        text_field_tag(name, value, options.merge(type: :hidden, autocomplete: "off"))
      end

3Notes

hidden field can be changed by JS

HeeL · Dec 8, 20111 thank

Plumba, it's not that useless if you think about possibility to change a hidden field with JS

Storing array values

jebin · Jan 16, 20141 thank

I tried to add a array value using hidden_field_tag and access it in jquery. It just returns the flattened version of array. eg:(If i try to store [1,[1,2,3]] in hidden_field_tag , in jquery iam just getting '1 1 2 3') but if i use input field with type=hidden iam getting the correct value. Why is that?

onchange attribute on a hidden field is useless

plumba · Feb 7, 2011

In the third example there is no sense to set onchange event since it will never happen...