Pass JSP value to external Javascript file

Question

Is there a way that I can pass a JSP variable value to an external Javascript file by using only Javascript and JSP. Something like:

JSP

String str = "Hello";

external.js

//not working
var str = "<%=str%>";

Thanks.

Answer 1

If you think that the java script is written inside the JSP then its possible.

But you are providing the JS file separately then you can make a global variable and that variable will be available everywhere.

Answer 2

Your not going to be able to write to the external js file. However if you put var s = "<%=str%>";in your jsp s will become a global variable which can be used within your external js file because s will have a global scope. So in a nutshell, you can't modify the actual js file, but you can add a variable with global scope and reference that variable within your external js script.