How to use javascript variables in ruby

rubyonrails-talk
#1

Hi friends,

How to use javascript variables in ruby.

i have activity id on a_id

function(a_id)

{

<%@foo=Activity.where("activity_id = ? ", a_id)

}

how can solve it

#2

Name it: app/assets/javascript/file.js.erb and it will go through ERB.

#3

Actually I think I'm wrong try:
http://railscasts.com/episodes/324-passing-data-to-javascript?view=asciicast

#4

It's not at all clear to me what you are asking, but remember:

- Ruby runs on the server;
- Javascript runs in the browser.
- Sometimes Ruby on the server is used to create/modify Javascript to be run in the browser.

#5

hi

here i have mention example code

#6

hi

here i have mention example code

<script type="text/javascript">

var js_name="daya";

<%=@user=User.where("name=?", js_name%>

alert("<%=@user%>");

</script >

If you're going to use Erb in your JavaScript, then you must name your file whatever.js.erb. Then your <%= %> will expand to be whatever the local value of @user is at the moment that script is requested. You will need a controller, too, and your request will need to have some context around it. If your controller had a respond_to block in it, and your JavaScript file was named sensibly for the controller method, then this would Just Work™,

    respond_to do |format|
      format.js { render :layout => false }
      format.html
    end

Walter

#7

OK, evaluate that code in light of what I said previously:

- Ruby runs on the server;
- Javascript runs in the browser.

Now:

1) What do you think that code will do???
2) What are you actually trying to accomplish?

#8

Remember the above is evaluated on the /server/ before the page is
rendered. js_name is not meaningful at that time.

Colin