为什么不链接到我的js.erb文件中

Question

I have this in my js.erb file

var cart_item = "<table id='something' style='width:100%'>"; 
cart_item += "<tr><td>";
cart_item += "<%= @contact.name %>";
cart_item += "<%= link_to_remote 'Delete', :url => {:controller => 'registrations', :action => 'destroy' %>";
cart_item += "</td>";
cart_item += "</tr></table>";

$("#cart").append(cart_item);

and it just hangs but when i comment out the link_to_funtion everything works great. I even tried to make this a link_to and it still hangs and does nothing ....am i missing something

Answer 1

Extract all of that to a partial, call it _cart_item.html.erb :

<table id='something' style='width:100%'>
<tr><td>
<%= @contact.name %>
<%= link_to 'Delete', {:controller => 'registrations', :action => 'destroy', :id => @contact.id}, :remote => true %>
</td>
</tr></table>

Then, your js.erb file will look like this:

$("#cart").append(<%= escape_javascript(render(:partial => "cart_item")) %>);

But Ryan Bigg is still right, you should:

• use RESTful routes and route helpers.
• use :remote => true for AJAX requests, as I've done.
• make sure you're passing an id to the destroy action so it knows which object to destroy.

Answer 2

Four things.

One: No need for the :url option. You can just pass the hash as the second argument to link_to_remote and it'll work.

Two: You should use the URL helpers for this. Also, if you're using the destroy action you'll probably want to pass through an id. This means that you would do something like this instead:

link_to_remote 'Delete', registration_path(id)

You would be doing something like resources :registrations for this. Although, not sure what registrations are within your application, so I can really advise on this.

Three: most importantly, you're missing the end curly bracket for the hash on the link_to_remote line. This would raise a syntax error if you left it out.

Four: link_to_remote is deprecated in Rails 3.0. You should use link_to 'Delete', registration_path(id), :remote => true