ruby on rails - String interpolation in HTML attributes in an ERB file -

I have a feature that looks like this:

  data-text = " I won by ### playing ... "  
 Where should ### be in my credit rating.  
 How do I apply it  
  data-url = <% = request.scheme%> & gt;  
 I'm trying:  
 + "//" + <% = request.port%>   
 In this situation I do not know how the whole plan should be around the port.  
 Thanks   
 
 
  data-text = "I play ## Credits} won ... "  
 You can apply the same principle to other strings, such as:  
  data-url =" # {request. Scheme} // # {request.port} "