While reading a blog, I stumbled upon a mention of a j function in Rails. The author was using it for ajax style page updates.
$('#cart').html("<%=j render @cart %>");
I understand that they are using partials to render the cart partial, but I'm curious about the purpose of j. I've read some articles that mention it converts the string to something JavaScript will accept, but what does that actually mean?
John was the one who provided the correct answer, but I'll go into more detail:
Are you familiar with the fundamental concept of ajax? Let's say you want to allow users to create comments in a more dynamic way.
In a rails application, you can handle POST requests in your CommentsController like this:
def create
@comment = Comment.new(params[:comment])
respond_to do |format|
render.js
end
end
So, when an ajax request is sent from the client side (using jquery/javascript) to the CommentsController, it will respond with the .js format, triggering the _create.js.erb partial.
This partial will then display the new comment by appending it to the list of comments, like this:
$('.comments').append("<%=j render @comment %>");
Now, regarding the j or escape_javascript method:
A malicious user could submit a comment with harmful javascript code that could potentially be executed on the page, unless you use the j method, which
Escapes carriage returns and single and double quotes for JavaScript segments.
and prevents the code from executing in the browser.
prevent_escape(javascript)Prevents the escape of special characters like carriage returns and quotes in JavaScript code.
Can also be used with the shorthand j().
Found in the official Ruby on Rails documentation.
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