Netbeans Autosubmit Drop Down Boxes

The immediate attribute against the dropdown box is a bit misleading. This is wholly different from the autopostback=”true” attribute on ASP.net.

With JSF, you need to write your own javascript, or use the IDE context menu to write one for you.

Here’s a code sample showing how to change the contents of a second dropdown box based on the value of the first one.

    public void dropDown1_processValueChange(ValueChangeEvent event) {

        String newValue = (String) event.getNewValue();
        java.util.ArrayList options = new java.util.ArrayList();
        if (newValue.equals("Australia"))
        {
            options.add(new Option("Sydney"));
            options.add(new Option("Canberra"));
            options.add(new Option("Brisbane"));
            options.add(new Option("Perth"));
            options.add(new Option("Melbourne"));
        } else if (newValue.equals("US")) {
            options.add(new Option("Washington"));
            options.add(new Option("New York"));
            options.add(new Option("Los Angeles"));
        } else if (newValue.equals("Japan")) {
            options.add(new Option("Tokyo"));
            options.add(new Option("Saitama"));
            options.add(new Option("Niigata"));
        }

        int size = options.size();
        Option[] optarr = new Option[size];
        options.toArray(optarr);
        dropDown2DefaultOptions.setOptions(optarr);
    }