Using javascript: How can a variable be added to a string containing quotation marks?

Question

The following is an extract from a javascript file.

Correct string:

url: '<%=ResolveUrl("~/folder/filename.aspx")%>'

How can a variable be inserted within the URL? (As below)

var variable = "filename.aspx"
url: '<%=ResolveUrl("~/folder/" + variable + ")%>'

Answer 1

You can't .
ResolveUrl is something that is translated to a string on the server side while your variable is a js var.
What you can do is maybe:

var variable = "filename.aspx"
url = '<%=ResolveUrl("~/folder/___MYVAR___")%>' // this will create a /folder/___MYVAR__
url = url.replace('___MYVAR___', variable); // this will create /folder/filename.aspx