How to pass a javascript variable into a erb code in a js view?

Question

I have this Javascript view in my Rails 3 project:

app/views/expenses/new_daily.js.erb

var i = parseInt($(\'#daily\').attr(\'data-num\')) + 1;
//$(\'         


        

Answer 1

Let's make shure we understand each other. Your erb template (new_daily.js.erb) will be processed on the server side, ruby code will be evaluated (within <% %>), substitution made, and then resulting javascript will be sent to browser. On the client side the browser will then evaluate this javascript code and variable i will be assigned a value.
Now when do you want to pass this variable and to what partial?

Answer 2

Yes you can pass the value by using jquery;

<%=f.text_field :email ,:id=>"email_field" %>

<script type="text/javascript">
   var my_email= "my@email.com"
   $(document).ready(function(){
        $("#email_field").val(my_email);
   });
</script>