如何在 Ruby on Rails 应用程序中访问 Javascript 函数内的实例变量？

Question

I have a form for editing profiles. Rails automatically generates the form id as 'edit_profile_##' where ## is the profile id of the current user(instance variable-@profile_id). I need to use this form id for my javascript functions. Is there a way to get the current user's profile id inside js? Or is there a way I can override the automatic id generation by rails?

Answer 1

you have to send that using function parameter

.html.erb

<script type="text/javascript">
   var user_id = <%= @profile_id %>; // for integer
   var user_name = '<%= @profile_name %>'; // for string

   abc(user_id)// this is your function in .js file

</script>

.js

 function abc(id){
   alert(""+id)
 }

Answer 2

Are you using normal *.html.erb views?

Can't you do something like :

<script type="text/javascript">
    user_id = <%= @profile_id %>;
</script>

?

Answer 3

lets say you have @user = {'name'=>'steve'} in the controller

now your html page can render <p> <%=@user['name']%> </p>

now lets say you want to be able to access @user in your .js file; add thisThing & data-url to your tag <p id="thisThing" data-url="<%=@user%>" > <%=@user['name']%> </p>

in your .js file var userInfo = $('#thisThing').data('url')

now you got userInfo in your .js (its in string)