Populating one select menu based on another select menu using AJAX in Struts2

Question

I\'m trying to use AJAX at very first time in Struts2. Therefore, I do not have precise idea about it.

There are two s, one holds a list

Answer 1

The same way you can do it in Struts2, but instead of servlet you can use the action. For example

@Action(value="/PopulateStateList", results=@Result(type="json", params = {"contentType", "application/json", "root", "map"}))
public class AjaxMapAction extends ActionSupport {

  Long countryId; //getter and setter

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

  public Map<String, String> getMap() {
    return map;
  }

    @Override
    public String execute() throws Exception {

        map.put("1", "India");
        map.put("2", "America");
        map.put("3", "England");
        map.put("4", "Japan");
        map.put("5", "Germany");

        return SUCCESS;
    }
}

Now, you can use the JSON on the client

  success: function(response)
  {
     if(typeof response==='object') 
     {
        var $select = $('#state');
        $select.find('option').remove();
        $('<option>').val("-1").text("Select").appendTo($select)
        $.each(response, function(key, value) {
        $('<option>').val(key).text(value).appendTo($select);
     }
  },