OAF_開發系列07_實現OAF下拉菜單的上下聯動Poplist Synchor（案例）

20150706 Created By BaoXinjian

1、摘要

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下拉列表的級聯顯示是很是經常使用的一種界面顯示效果，在FORMS中我常做，做法也很簡單，可OAF中顯然有點麻煩了

現假定有張表,裏面有兩個字段，一個是Province(省)，一個是City(市)

現須要在頁面上放置兩個下拉列表字段，一個選擇省，一個選擇市，固然，選擇市的下拉列表值須要根據省的下拉列表的選擇進行篩選。

實現思路:

實際上很簡單，與FORMS差很少，就是要動態的指定選擇市的下拉列表的查詢，當選擇完省後，當即更新市的查詢

在Form中經過Trigger進行下拉菜單變動事件的抓取

在OAF中經過Event進行下來菜單變動事件的抓取

 

2、實現分析

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Step1. 建立數據庫資料， 省和市的資料

 

Step2. 新建一個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(基於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(基於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(基於SQL):

VO Name:            ChinaAreaVO

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

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

 

Step3. 聯AM與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); //當選擇省時，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); } //當選擇市時，刷新縣
    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); } //當刷新寫時，將省市縣資料放到EmployeeAddress欄位中，完成自動賦值
    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實現方法

    //當刷新省時，變動市VO的條件
    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(); } //當刷新市時，變動縣VO的條件
    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(); } //當刷新省市縣時，自動賦值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 測試三個下拉菜單的級聯，和對Address的自動賦值

 

 

Thanks and Regards

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