count <li> items in div, RJS

rubyonrails-talk
1

Hi Igor,

Igor K. wrote:

How i can count <li> items in div using RJS?

<div id='results'>   <li id="1"> one </li>   <li id="2"> two </li>   <li id="3"> three </li> </div> <%= link_to_remote.......ADD %>

and in add action i want to add new li item with unique ID and get <li>'s elements count?

Just count them in the controller method you invoke as you add them. Store the count in a session variable or in a table to persist your count.

HTH, Bill

2

Hi Igor,

Igor K. wrote:

I have a following code in add.rjs

count = 0 page.select('#results li').each do |element|   count = count + 1   #element.hide end page.insert_html :bottom, 'results', "<li id=#{count.to_s}>#{a.to_s + " >>> " + count.to_s}</li>" page.visual_effect :highlight, count.to_s, :duration => 2.5

and following in view <div id="results">   <li>one</li> </div> <%= link_to_remote "add", :url => {:action => :add} %>

and i always get count = 1

I'm not sure I understand exactly what it is you're trying to accomplish, but in general.... I would recomment keeping track of 'count' in your controller method; storing / retrieving it there and making it available to your view via an instance variable. You're not dealing with a static page of which you have no knowledge. Everything that's on the page is put there by your app during the session. No?

HTH, Bill

3

Hi Igor

In an action in the controller, responding to the xhr request when you do

render :update to |page|

I just did a page.inspect in the log and found @content_for_layout - I think you would have to do something like page.session.content_for_layout - the log is pretty ugly - you can check.

But, if you have @content_for_layout you could count the occurance of

  • in that and unless you have
  • in your layout you will have the number of li’s.

    However, this sounds very convoluted - you would probably be better of just adding the milliseconds id for the li.

    cheers Ivor