From: Brian Candler <b.candler@...>
Date: 2009-11-16T19:56:14+09:00
Subject: Re: erb and js question

Derek Smith wrote:
> Here is my code:
> 
> cat login.html.erb
> <!-- Begin Login Bar -->
> <div id="login">
>   <% form_tag :action => 'login' do %>
>     <br />
>     <label for='username'>Username:</label>
>     <%= text_field_tag 'username' %>
>     <label for='password'>Password:</label>
>     <%= password_field_tag 'password' %>
>     <%= image_submit_tag 'login.png' %>
>     <br />
>     <br />
>   <% end %>
> </div>
> <!-- End Login Bar -->
> 
> Yet I am still unsure how to integrate this code, maybe just the JS
> block?

This isn't really a Ruby question, but briefly: you can emit a

<script language='javascript'>
  ...
</script>

which does what you want. However:

1. You want this to happen when the page has finished loading, so write 
it to be triggered on the onload event.

2. It's cleaner to put it in the <HEAD> of your document, which could be 
in the layout or using content_for :head

3. It's cleaner to put it in a separate Javascript file, e.g. 
public/javascripts/focus_user.js, and then all you need is:

  <%= javascript_include_tag 'focus_user' %>

This sort of stuff is wonderfully easy to do using jQuery, and I 
recommend it strongly. All you would need is:

jQuery( function($) {
  $('#username').focus();
});
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