method

field_id

v8.0.0 - Show latest stable - Class: ActionView::Helpers::FormTagHelper

field_id(object_name, method_name, *suffixes, index: nil, namespace: nil)

public

Generate an HTML id attribute value for the given name and field combination

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

<%= label_tag :post, :title %>
<%= text_field :post, :title, aria: { describedby: field_id(:post, :title, :error) } %>
<%= tag.span("is blank", id: field_id(:post, :title, :error) %>

In the example above, the <input type="text"> element built by the call to text_field declares an aria-describedby attribute referencing the <span> element, sharing a common id root (post_title, in this case).

# File actionview/lib/action_view/helpers/form_tag_helper.rb, line 102
      def field_id(object_name, method_name, *suffixes, index: nil, namespace: nil)
        if object_name.respond_to?(:model_name)
          object_name = object_name.model_name.singular
        end

        sanitized_object_name = object_name.to_s.gsub(/\]\[|[^-a-zA-Z0-9:.]/, "_").delete_suffix("_")

        sanitized_method_name = method_name.to_s.delete_suffix("?")

        [
          namespace,
          sanitized_object_name.presence,
          (index unless sanitized_object_name.empty?),
          sanitized_method_name,
          *suffixes,
        ].tap(&:compact!).join("_")
      end

field_id

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