spring side 学习与实践二

spring side 学习与实践二

目标:实现分类的下拉菜单,例如车型是属于某个品牌的某个车型.

1  < html:select property = " brandId " >
2                           < html:optionsCollection name = " brands "  value = " id "  label = " name " />
3                           </ html:select >

首先是添加时要初始化brands:

1      @Override
2       protected   void  refrenceData(HttpServletRequest request) {
3          request.setAttribute( " brands " , modelManager.getBrand());
4      }

其次是修改时要在下拉菜单显示已选值:

1  protected   void  onInitForm(ActionForm form, HttpServletRequest request,TModel model) {
2          
3           if  (model.getBrand()  !=   null ) {
4              LazyValidatorForm bookForm  =  (LazyValidatorForm) form;
5              bookForm.set( " brandId " ,model.getBrand().getId());
6          }
7      }

问题:在添加时要注意不是model!=null,而是model的brand!=null才赋值