FormController

[radone]

Can anyone explain me what this part of code do?


return new ModelAndView("countryList", Constants.COUNTRY_LIST,
manager.getObjects(Country.class));


I guess the result is that I can use variable "countryList" in my JSP file.

What should I do if I need to display on 1 page:
- list of Countries
- list of Towns
Together?

Thanks in advance.
[/code]

[huijzer]

You are returning a new ModelAndView object with three parameters:

1. viewName - name of the View to render, to be resolved by the DispatcherServlet
2. modelName - name of the single entry in the model
3. modelObject - the single model object

This means that the view that maps to "countryList" has the list of countries available as Constants.COUNTRY_LIST

If you want to pass in both countries and towns, use a different constructor for ModelAndView:


Map myModel = new HashMap();
myModel.put(Constants.COUNTRY_LIST, manager.getObjects(Country.class));
myModel.put(Constants.TOWN_LIST, manager.getObjects(Town.class));

return new ModelAndView(getViewName(), myModel);


Hope this helps,
Arjan Huijzer

[huijzer]

Sorry, that last line of code should read:


return new ModelAndView("countryList", myModel);

[olivier]

Just one more precision, countryList, is your viewName, so it's not a variable that you will be able to use in your jsp.

To retrieve the country list, you will use the variable :
Constants.COUNTRY_LIST

[radone]

If I need to display list even on non-submit action (viewing)- is it suitable to create
Map in formBackingObject too?

Somthing like this:

protected Object formBackingObject(HttpServletRequest request)
throws Exception {
if (log.isDebugEnabled()) {
log.debug("entering 'formBackingObject' method...");
}

String id = request.getParameter("id");
Town town = null;

if (!StringUtils.isEmpty(id)) {
town = townManager.getTown(id);
return town;
} else {
Country cc = new Country();
cc.setCode("CZ"); // Dafault opinion

town = new Town();
town.setCountry(cc);
}

// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!
// return town;
Map resultMap = new HashMap();
resultMap.put(Constants.COUNTRY_LIST, manager.getObjects(Country.class));
resultMap.put(Constants.TOWN_LIST, manager.getObjects(Town.class));

return resultMap;
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!
}

Thanx in advance.

[radone]

For anyone having the common problem - look at
protected Map referenceData(HttpServletRequest request) method
from SimpleFormController class