Expert Spring MVC and Web Flow

In Listing 8-27 we show an example Controllerthat puts options for the grouped form

input fields into a Mapnamed options. Listing 8-28 shows a template that displays the same set

of options as both a single select drop-down list and a group of check boxes. Lastly in Listing

8-29 we show the HTML that will be rendered from the template.

Listing 8-27.Setting the Options Map in a Controller

public ModelAndView handleRequest(...) {

Map model = new HashMap();

Map<String, String> options = new HashMap<String, String>();

options.put("NYC", "New York City");

options.put("LON", "London");

options.put("PAR", "Paris");

model.put("options", options);

return new ModelAndView("cityForm", options);

}

Listing 8-28.Displaying the Options in the Template

<!-- can only select one here! -->

#springFormSingleSelect("command.city" $options "")

<br>

<!-- can select more than one here -->

#springFormCheckboxes("command.city" $options "<br>" "")

Listing 8-29.HTML Output from the Grouped Input Macros

<!-- can only select one here! -->

<select name="city" >

<option value="LON"

>

London</option>

<option value="NYC"

>

New York City</option>

<option value="PAR"

>

Paris</option>

</select>

<br>

<!-- can select more than one here -->

<input type="checkbox" name="city" value="LON"

> London <br>

246 CHAPTER 8 ■SUPPORTED VIEW TYPES