Passing Parameters from JSP with Drill Down Graphs

Question

Hello,
I have 2 JSP's where when user clicks on the bar graph it drill down and goes to next JSP, it is hyperlink. How can I pass parameters using HttpPortletRendererUtil.portletParameter
My JSP code is something like this which is pasted below.
StandardCategoryURLGenerator("xy_chart.jsp","series","section")) is the function, I need to use for drill down.
Kindly help me with this and any help is highly appreciable.
Thanks
************ JSP**************
CategoryAxis categoryAxis = new CategoryAxis("Site");
ValueAxis valueAxis = new NumberAxis("Value");
StackedBarRenderer3D rend = new StackedBarRenderer3D();
StandardCategoryToolTipGenerator tt = new StandardCategoryToolTipGenerator();
rend.setItemURLGenerator(new StandardCategoryURLGenerator("xy_chart.jsp","series","section"));

Answer 1

Trenton,
One way to pass parameters to other portlets on the page while using a form is to create a hidden form field and assign it the value that you need to pass to it. If the hidden field has an unqualified name (i.e. not created by using the portletParameter method) then it will be seen by all portlets on the page.
Since all the form fields are passed on to the query string as part of the URL, you can then use request.getParameter(paramName) to take different actions in your portlets.
You could use different techniques where based on the values you pass on to parameters of the portlets, some portlets make specific updates to themselves. Though the whole page would be refreshed, you could allow portlets to decide based on the incoming parameter value whether they need to change or not.
So given the functionality you desire - here's something you might try.
1) Create hidden form field that gets populated when you select values from the drop-down lookup.
One way to do this would be to add a onChange ="populateMyHiddenParam(this.form)" to your form item that changes.
And you could add a small JavaScript function that populates the parameter.
e.g.
function populateMyHiddenParam(thisForm){
thisForm.myHiddenParam.value=thisForm.elements[4].value;
2)In the other JSP portlet (on the same page) where you need to populate a table based on the value selected, just get the parameter value passed by using request.getParameter("myHiddenParam").
Since you want this parameter to be read by other portlets, you need to create it as an unqualified parameter. So dont call the HTTPPortletRendererUtil.portletParameter while assigning the name to the form component for the hidden field.
Hope this helps.