<delete-button> : Hobo Cookbook

<delete-button>

Provides either an ajax or non-ajax delete button to send a RESTful “DELETE”. The context should be a record for which you to want provide a delete button.

The Rapid Library has a convention of marking (in the output HTML, using a special CSS class) elements as “object elements”, with the class and ID of the ActiveRecord object that they represent. <delete-button> assumes it is placed inside such an element, and will automatically find the right element to remove (fade out) from the DOM. The <collection> tag adds this metadata (CSS class) automatically, so <delete-button> works well when used inside a <collection>. This is a Clever Trick which needs to be revisted and perhaps simplified.

If used within a <collection>, <delete-button> also knows how to add an “empty message” such as “no comments to display” when you delete the last item. Clever Tricks abound.

Current limitation: There is no support for the ajax callbacks at this time.

All the standard ajax attributes except the callbacks are supported (see the main taglib documention for Rapid Forms).

Attributes

label: The label for the button. Default: “Remove”
in-place: delete in place (ajax)? Default: true, or false if the record to be deleted is the same as the top level context of the page
image: URL of an image for the button. Changes the rendered tag from <input type='button'> to <input type='image' src='...'>
fade: Perform the fade effect (true/false)? Default: true

Show Source

<def attrs='label, update, in-place, image, confirm, fade, subsite' tag='delete-button'><%=
  in_place = false if in_place.nil? && this == @this && request.method == :get
  url = object_url(this, :method => :delete, :subsite => subsite)
  if (Hobo::Dryml.last_if = url && can_delete?)
    attributes = attributes.merge(if image
                                    { :type => "image", :src => "#{base_url}/images/#{image}" }
                                  else
                                    { :type => "button" }
                                  end)
    label ||= ht("hobo.actions.remove", :default=>"Remove") 
    confirm = ht("hobo.messages.confirm", :default=>"Are you sure?") if confirm.nil?
    
    add_classes!(attributes,
                 image ? "image-button" : "button",
                 "delete-button delete-#{this.class.name.underscore.dasherize}-button")
    if url
      if in_place == false
        attributes[:confirm] = confirm if confirm
        attributes[:method] = :delete
        button_to(label, url, attributes)
      else
        fade = true if fade.nil?
        attributes[:value] = label
        attributes[:onclick] = "Hobo.removeButton(this, '#{url}', #{js_updates(update)}, {fade:#{fade}, confirm: #{confirm.inspect}})"
        element(:input, attributes, nil, true, true)
      end
    end
  else
    ""
  end
%></def>

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<delete-button>

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