Struts 2 make dynamic parameter

Question

I am using Struts 2 and JavaScript. I want to edit a parameter value or add parameter to URL with JavaScript to make dynamic parameter. I can not set value for param why this not have id. Any other form of do?

var urle = document.getElementsByName("vari");          
    urle.value = 5;

<s:url var="urlex" action="actionDo"><s:param name="vari" value=""/></s:url>

Answer 1

Struts tags are JSP tags that compiled and executed on server, JavaScript is executed on client browser. You can't access the server from javascript code without making ajax request. But you don't need too. Use

var url = '<s:url var="urlex" action="actionDo">' +'?vari=' + val;