Rails 3.2.2 not executing rjs

Question

I'm following the book Pragmatic Agile Web Development With Rails 4th Edition, BUT I'm using Rails 3.2.2 instead of 3.0.5 as recommended in the book: ``` ~$ ruby -v ruby 1.9.3p125 (2012-02-16) [i686-linux] ~$ rails -v Rails 3.2.2 ``` I got stuck when including AJAX to redraw the Cart without reloading the page. Here is the create action in line_items_controller.rb: ``` def create @cart = current_cart product = Product.find(params[:product_id]) @line_item = @cart.add_product(product.id) respond_to do |format| if @line_item.save format.html { redirect_to(store_url) } format.js format.json { render json: @line_item, status: :created, location: @line_item } else format.html { render action: "new" } format.json { render json: @line_item.errors, status: :unprocessable_entity } end end end ``` And here is my RJS file create.js.rjs (under app/views/line_items): ``` page.alert('NO PROBLEM HERE') page.replace_html('cart', render(@cart)) ``` However, when I click the button that starts this acti…

Accepted Answer

It looks like `rjs` has been removed as the default as of Rails 3.1. You could get it back by installing the `prototype-rails` gem, but I think you should just use jQuery, which is the new default. As for your code, the reason it's not working is that it's an `rjs` template being interpreted as `.js.erb`, and this is likely just producing invalid JavaScript (you should see errors in the JavaScript console in your browser). An `rjs` template used to set the `page` variable for you, and you would write Ruby code using it to manipulate your page. In a `.js.erb` template, it works more like in your `.html.erb` views. You write actual JavaScript, with Ruby embedded using `<% %>` tags. So the code in `create.js.erb` should look something like this: ``` alert('NO PROBLEM HERE'); $('#cart').html("<%= escape_javascript(render(@cart)) %>"); ```

Rails 3.2.2 not executing rjs

Solution

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