Adam Akhtar wrote:
> Im incorporating ajax / javascript stuff for the first time in my
> project and im a bit confused by all various methods available, rjs,
> prototype, javascript etc so please excuse me if this is an obvious
> question.
>
> Whilst looping though an array of model objects in my view I want to be
> able to show or hide a div that contains the message "Your list is
> empty".
Does the program know this when the page renders, or will the message change
during the time your user looks at the page?
> so something like this
>
> <% if items.empty?>
> #the following is not the correct way
> $('no-items-msg').show
> <% else >
> $('no-items-msg').hide
> <% items.each do |item|%>
> render :partial => "item_rows"......
> <%end%>
Things in <% erb %> tags happen only when the page renders, so you could just
put that <div id='no-items-msg'> itself inside the <% if %> blocks. No
Javascript.
If the message must change at runtime, then you will need an Ajax call, such as
remote_function, to call an action on your server. It uses 'render :update' to
call show() or hide() on that div.
--
Phlip
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