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Declare ActionView::Helpers::FormBuilder#id and #field_id

 4 years ago
source link: https://github.com/rails/rails/pull/40127
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seanpdoyle commented on Aug 28 •

edited

Summary

ActionView::Helpers::FormBuilder#id

Generate an HTML id attribute value.

Return the <form> element's id attribute.

<%= form_for @post do |f| %>
  <%# ... %>

  <% content_for :sticky_footer do %>
    <%= form.button(form: f.id) %>
  <% end %>
<% end %>

In the example above, the :sticky_footer content area will exist
outside of the <form> element. By declaring the form HTML
attribute, we hint to the browser that the
generated <button> element should be treated as the <form> element's
submit button, regardless of where it exists in the DOM.

A similar pattern could be used for <input>
elements (or other form controls) that do not
descend from the <form> element.

ActionView::Helpers::FormBuilder#field_id

Generate an HTML id attribute value for the given field

Return the value generated by the FormBuilder for the given
attribute name.

<%= form_for @post do |f| %>
  <%= f.label :title %>
  <%= f.text_field :title, aria: { describedby: f.field_id(:title, :error) } %>
  <span id="<%= f.field_id(:title, :error) %>">is blank</span>
<% end %>

In the example above, the element built by
the call to FormBuilder#text_field declares an
aria-describedby attribute referencing the
element, sharing a common id root (post_title, in this
case).

This method is powered by the field_id helper declared in
action_view/helpers/form_tag_helper, which is made available for
general template calls, separate from a FormBuilder instance.


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