avoid button_to action with javascript in rails -


i making shopping cart , user can add products cart when signed in.

i created javascript when user clicks button "add cart", evaluates if signed in , displays message, need stop button action because cause problem render action. thanks. here code 

<%=button_to 'add cart',line_items_path(:product_id => product.id),:onclick=>"javascript:is_user()"%>

you try this:

<% if current_user.present? %>   <%= button_to 'add cart',line_items_path(:product_id => product.id) %> <% else %>   <%= button_to 'login add cart', '' %> <% end %>

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