Using JavaScript and Ajax - Stripes...and Java Web Development is Fun Again - page 337

Figure 15.8: Car models are populated after selecting a make.
Download ajax/src/stripesbook/action/PartialFormActionBean.java
package stripesbook.action;
public class PartialFormActionBean extends BaseActionBean {
private static final String VIEW = "/WEB-INF/jsp/cars.jsp";
private static final String RESULT = "/WEB-INF/jsp/partial_form.jsp";
private Cars cars = new Cars();
public String make;
private List<String> models;
@DefaultHandler
public Resolution view() {
return new ForwardResolution(VIEW);
}
public Cars getCars() {
return cars;
}
public List<String> getModels() {
return models;
}
public Resolution updateModels() {
models = cars.get(make);
return new ForwardResolution(RESULT);
}
}
The form contains the select box with the car makes and a 'model-
Choices' placeholder for the car models:
Download ajax/web/WEB-INF/jsp/cars.jsp
<s:form beanclass="stripesbook.action.PartialFormActionBean">
Make:
<s:select name="make" onchange="updateModels(this);">
<s:option value="" label="..."/>
<s:options-map map="${actionBean.cars}" label="key"/>
</s:select>
Model:
<span id="modelChoices"><s:select name="models"/></span>
</s:form>