Thanks for the hint, I followed the instruction but somehow, the browser could not find the javascript. Here what I've done in my jboss-portlet.xml <portlet> | <portlet-name>HelloWorldJSPPortlet</portlet-name> | <transaction> | <trans-attribute>Required</trans-attribute> | </transaction> | <header-content> | <script type="text/javascript" src="/js/myscript.js"/> | </header-content> | </portlet> | | i created a folder called js at the same level as WEB-INF and put myscript.js in there. When I click on the button in that jsp portlet to invoke the function in javascript, the browser complaints that it can not find that file. So, my war structure is: mywar.war ---- js ---- myscript.js ---- WEB-INF ---- jboss-portlet.xml ---- some more xml files here is the code in my jsp file | <%@ taglib uri="http://java.sun.com/portlet" prefix="portlet" %> | | <portlet:defineObjects/> | <div id="msg">I am default</div> | <br/> | <button onclick="testing();">Change me</button> | in myscript.js | function testing(){ | document.getElementById("msg").innerHTML = "I am changed"; | } | Am I missing something here? Thanks TL View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4070247#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...