OAF_开发系列07_实现OAF下拉菜单的上下联动Poplist Synchor（案例）

20150706 Created By BaoXinjian

1、摘要

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下拉列表的级联显示是很是经常使用的一种界面显示效果，在FORMS中我常做，做法也很简单，可OAF中显然有点麻烦了

现假定有张表,里面有两个字段，一个是Province(省)，一个是City(市)

现须要在页面上放置两个下拉列表字段，一个选择省，一个选择市，固然，选择市的下拉列表值须要根据省的下拉列表的选择进行筛选。

实现思路:

实际上很简单，与FORMS差很少，就是要动态的指定选择市的下拉列表的查询，当选择完省后，当即更新市的查询

在Form中经过Trigger进行下拉菜单变动事件的抓取

在OAF中经过Event进行下来菜单变动事件的抓取

 

2、实现分析

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Step1. 建立数据库资料， 省和市的资料

 

Step2. 新建一个Business Component Package(For AM and VO)

Step2.1 新建BC:

Package Name:   bxj.oracle.apps.ap.poplist.server

Step2.2 新建AM:

AM Name:          poplistAM

AM Path:            bxj.oracle.apps.ap.poplist.server

Step2.3 新建省的VO(基于SQL):

VO Name:           ChinaProvinceVO

VO Path:             bxj.oracle.apps.ap.poplist.server

SQL:                    SELECT id, provinceid, province FROM bxj_province

Step2.4 新建市的VO(基于SQL):

VO Name:            ChinaCityVO

VO Path:              bxj.oracle.apps.ap.server

SQL:                    SELECT id, cityid, city, father FROM bxj_city

Step2.5 新建市的VO(基于SQL):

VO Name:            ChinaAreaVO

VO Path:              bxj.oracle.apps.ap.server

       SQL:                    SELECT id, areaid, area, father FROM bxj_area

 

Step3. 联AM与VO(方法略)

 

Step4.新建Web Page 及Item

Step4.1新建Page

 

Step4.2 新建Item

 

 

Step5. 建立AM和CO方法

Step5.1 建立CO控制方法

  public void processFormRequest(OAPageContext pageContext, OAWebBean webBean) { super.processFormRequest(pageContext, webBean); OAApplicationModule empAM = pageContext.getApplicationModule(webBean); //当选择省时，刷新市
    if ("refProvince".equals(pageContext.getParameter(EVENT_PARAM))) { String province = pageContext.getParameter("ChinaProvinceList"); String city = pageContext.getParameter("ChinaCityList"); String area = pageContext.getParameter("ChinaAreaList"); Serializable[] amprovinceparams = { province }; Serializable[] amaddressparams = { province, city, area }; empAM.invokeMethod("initCityAddress", amprovinceparams); empAM.invokeMethod("initAddress", amaddressparams); } //当选择市时，刷新县
    if ("refCity".equals(pageContext.getParameter(EVENT_PARAM))) { String province = pageContext.getParameter("ChinaProvinceList"); String city = pageContext.getParameter("ChinaCityList"); String area = pageContext.getParameter("ChinaAreaList"); Serializable[] amcityparams = { city }; Serializable[] amaddressparams = { province, city, area }; empAM.invokeMethod("initAreaAddress", amcityparams); empAM.invokeMethod("initAddress", amaddressparams); } //当刷新写时，将省市县资料放到EmployeeAddress栏位中，完成自动赋值
    if ("refArea".equals(pageContext.getParameter(EVENT_PARAM))) { String province = pageContext.getParameter("ChinaProvinceList"); String city = pageContext.getParameter("ChinaCityList"); String area = pageContext.getParameter("ChinaAreaList"); Serializable[] amaddressparams = { province, city, area }; empAM.invokeMethod("initAddress", amaddressparams); } }

Step5.2 建立AM实现方法

    //当刷新省时，变动市VO的条件
    public void initCityAddress(String p_province) { poplistAMImpl addressAM = (poplistAMImpl) this.getpoplistAMSearch(); ChinaCityVOImpl chinacityVO = addressAM.getChinaCityVO(); chinacityVO.setWhereClause(" province = :1 "); chinacityVO.setWhereClauseParam(0, p_province); chinacityVO.executeQuery(); } //当刷新市时，变动县VO的条件
    public void initAreaAddress(String p_city) { poplistAMImpl addressAM = (poplistAMImpl) this.getpoplistAMSearch(); ChinaCityVOImpl chinacityVO = addressAM.getChinaCityVO(); chinacityVO.setWhereClause(" city = :1 "); chinacityVO.setWhereClauseParam(0, p_city); chinacityVO.executeQuery(); } //当刷新省市县时，自动赋值Address的值
    public void initAddress(String p_province, String p_cit, String p_area) { EmployeesVOImpl employeeVO = this.getEmployeesCreateVO(); EmployeesVORowImpl employeeRow = (EmployeesVORowImpl) employeeVO.getCurrentRow(); employeeRow.setEmployeeAddress(p_province + p_cit + p_area); }

 

Step6 测试三个下拉菜单的级联，和对Address的自动赋值

 

 

Thanks and Regards

参考： Tony Liu - http://blog.itpub.net/10359218/viewspace-677454/