Is there any way to access javasript variable inside the rails view. I just set some value of javascript variable and want to access it in rails view.
Thanks
4 Answers
You have to understand that ruby code in your views gets executed on the server - before any javascript on the page gets a change to be executed.
That's why you cannot do stuff like this:
<script>
var js_var = 1;
</script>
<%= get_value_of_js_var_somehow %>
The other way round it works:
<script>
var js_var = <% generate_value_with_ruby %>;
do_something_in_javascript_with_js_var();
</script>
1 Comment
ılǝ
and here is a very simple example how to "do_something_in_javascript" - stackoverflow.com/questions/6835512/…
You can pass a javascript variable to rails using AJAX. For example if you want to pass the id for an user to a method in a rails controller from javascript you can execute the following code:
<script>
var id = 1;
<%= remote_function :url => {:controller=>'controller_name', :action=>'method_name'}, :with => "'user_id=' + id" %>
</script>
You will receive the variable through a POST request, as a parameter. You can access it using params[:user_id].
def method_name
if params[:user_id].exists?
u = User.where('id = ?', params[:user_id]).first
end
puts u.path
end
Hope I've answered your question.
Comments
If you have this Javascript variable in a higher piece of javascript (per se: the application.js), then you can always just reference it in the view.
#application.js
var someVar = "Hello World";
Then in your view (executed on the client), you could to...
<script type='text/javascript'>
alert(someVar);
</script>
I think we need more specific ellaboration if one of these three posts doesn't answer your question.
Comments
Suppose we are having script as follows
<script type="text/javascript">
var a="some value";
document.getElementById('tagid').innerHTML='<%= tag(:div,content_tag(:p,' " +a+ " '), :id=>' " +a+ " ', name=>"somename") %>';
</script>
