Using RJS to highlight one LI if using insert_html on an UL?

It seems common to use RJS for quickly adding and highlighting a list
that is having content added to it like this:

http://rafb.net/paste/results/Z3m32g48.html

… where “my_list” would be an UL and the partial would insert a LI.

Given that example, is there an easy way to highlight only the newly
inserted LI instead of the whole UL? The only way I can see to do it is
to give each LI a unique identifier in the partial, constructed maybe
from the db id of the record being represented and then reconstruct that
id in the RJS and highlight it specifically but it doesnt seem a very
rails way to do it :slight_smile:

I am hoping that rails will be helpfully assigning some temporary DOM
attribute that I havent noticed :slight_smile:

Thanks
Dave

On Jun 21, 2006, at 7:59 AM, Dave V. wrote:

to give each LI a unique identifier in the partial, constructed maybe
from the db id of the record being represented and then reconstruct
that
id in the RJS and highlight it specifically but it doesnt seem a very
rails way to do it :slight_smile:

I am hoping that rails will be helpfully assigning some temporary DOM
attribute that I havent noticed :slight_smile:

Thanks
Dave

Hey Dave-

Ok I have a nice example for you. First a little extension to AR to

make each model instance have a dom_id method. Put this in lib and
require it in environment.rb

class ActiveRecord::Base
def dom_id(prefix=nil)
display_id = new_record? ? “new” : id
prefix ||= self.class.name.underscore
prefix != :bare ? “#{prefix.to_s.dasherize}-#{display_id}” :
display_id
end
end

In index.rhtml view

Products

    <% @products.each do |p| %>
  • <%= p.name -%>

    <%= link_to_remote "delete", :url => { :action => "delete_product", :id => p} %>
  • <% end %>

Add a Product

<%= error_messages_for "product" %> <% remote_form_for :product, @product, :url => { :action => "add_product" }, :loading => "Element.show('product_spinner')" do |f| %> <%= f.text_field :name %> <%= submit_tag 'Create Product', :class => 'submit_but' %> <%= spinner('product_spinner') %> <% end %>

_product.rhtml partial for one li item

  • <%= @product.name -%>

    <%= link_to_remote "delete", :url => { :action => "delete_product", :id => @product} %>
  • controller for adding and deleting products

    class AdminController < ApplicationController
    before_filter :login_required
    def index
    @products = @account.projects.find :all
    end

    def add_product
    @product = @account.products.new(params[:product])
    if @product.save
    render :update do |page|
    page.hide ‘product_spinner’
    page.insert_html :bottom, ‘products’, :partial =>
    ‘product’, :object => @product
    page[@product.dom_id].visual_effect :highlight
    end
    else
    render :action => ‘index’
    end
    end

    def delete_product
    product = @account.products.find(params[:id]).destroy
    render :update do |page|
    page[product.dom_id].visual_effect :slide_up
    end
    end
    end

    Hope that helps-

    Cheers-
    -Ezra

    Ezra

    Thanks for the very comprehensive reply.

    Dave

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