la cuarta ventana by bachmont 

Sometimes when you click on a link in an ATG JSP/DSP page you want a property of an ATG component to be set as well.  For example:

Foo
  

What gets tricky is if you also want a popup window to display the contents of this link.

The Wrong Way

I tried adapting the instructions from the tutorial Popup Windows | open new customised windows with JavaScript.

Foo
  

This does not work, i.e. the setter for baz in BarFormHandler is never called.

The Brute Force Way

I then reverted to the original DSP and looked at the outputted HTML.  Based on that I updated the DSP like this.

<% atg.servlet.DynamoHttpServletRequest dreq = atg.servlet.ServletUtil.getCurrentRequest(); %>
');">Foo

This works but is grotesque.

The Good Idea That Did Not Work

Then I realized I could just set a parameter in the URL and have the form handler use the value to set the property.

');">Foo

And in BarFormHandler

public boolean beforeSet(DynamoHttpServletRequest req,
            DynamoHttpServletResponse res) throws DropletFormException {

  String indexParam = request.getParameter("index");
  setIndex(Integer.parseInt(indexParam));

  return super.beforeSet(request, response);
}

This did not work plus I did not really like it because now I have a beforeSet method that is called for every single request.

The Winner

I then realized I did not read the tutorial Popup Windows | open new customised windows with JavaScript carefully.  There is a more elegant way to call the JavaScript which degrades gracefully for browsers that don’t support JavaScript.

Foo
  

This works, is elegant and requires just adding the onclick attribute to the original DSP.