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如何在第一次退学中选择价值时在第二次退学中增加价值?
原标题:how to add values in second dropdownchoice when i select value in first dropdownchoice?

i have two dropdownchoice,After selecting value from first dropdownchoice i need to
select list of related values from database table and add this list into second
dropdownchoice. Here is my sample code for reference.
Give me any hint or reference.

 HTML:
 <select wicket:id="DDCStartDate" style=" width : 98px;"></select>
 <select wicket:id="DDCEndDate" style=" width : 98px;">.

Java code:

  final DropDownChoice DDCStartDate=new DropDownChoice("DDCStartDate",new    
         PropertyModel(collectionReportModel, "DDCStartDate"),lst);
  add(DDCStartDate);
  DDCStartDate.setOutputMarkupId(true);

  final DropDownChoice DDCEndDate=new DropDownChoice("DDCEndDate",);
  add(DDCEndDate);
  DDCEndDate.setOutputMarkupId(true);

POJO代码:

     private Date DDCStartDate;
private Date DDCEndDate;
    public Date getDDCStartDate() 
{
    return DDCStartDate;
}
public void setDDCStartDate(Date dDCStartDate) 
{
    DDCStartDate = dDCStartDate;
}


public Date getDDCEndDate() {
    return DDCEndDate;
}
public void setDDCEndDate(Date dDCEndDate) {
    DDCEndDate = dDCEndDate;
}
最佳回答

你们可以通过美国宇宙航空研究开发机构的呼吁来做到这一点。 查阅Wicket例中的“Drop Down Options Example”。

http://www.wicket-library.com/wicket-examples/ajax/

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