设置field的背景颜色以及对stylesheet的理解

今天遇到一个需求：在做页面输入验证的时候，如果用户没有输入某个项，那么这个项显示为红色，一直没头绪，也找peoplebook，发现field有一个style的方法，后来又在谷歌上找，终于找到了方法：  Just to check, did you include custom stylesheet in PSSTYLEDEF? That is a key step in order to use any custom style sheet in PeopleCode or anywhere in app designer. This is what I did (a similar requirement) 

1) Define custom stylesheet, background #94CFC9 
2) Include the custom stylesheet in PSSTYLEDEF (our default style for Portal) 
3) Loop in peoplecode to find difference(as you did) and that's it.

代码贴图（row的saveedit级别）：

/*判断补签的时间段是否符合补签规则*/

Local datetime &PUNCH_DTTM_1;

Local datetime &PUNCH_DTTM_2;

Local datetime &PUNCH_DTTM_3;

Local datetime &PUNCH_DTTM_4;

Local string &KL_RPCH_FST_ST_WRK;

Local string &KL_RPCH_FST_OF_WRK;

Local string &KL_RPCH_SND_ST_WRK;

Local string &KL_RPCH_SND_OF_WRK;

Component string &SHOW_ERROR_FLAG;

&KL_RPCH_FST_ST_WRK_FLD = GetRow().GetRecord(Record.KL_RPNH_CRD_TBL).GetField(Field.KL_RPCH_FST_ST_WRK);

&KL_RPCH_FST_OF_WRK_FLD = GetRow().GetRecord(Record.KL_RPNH_CRD_TBL).GetField(Field.KL_RPCH_FST_OF_WRK);

&KL_RPCH_SND_ST_WRK_FLD = GetRow().GetRecord(Record.KL_RPNH_CRD_TBL).GetField(Field.KL_RPCH_SND_ST_WRK);

&KL_RPCH_SND_OF_WRK_FLD = GetRow().GetRecord(Record.KL_RPNH_CRD_TBL).GetField(Field.KL_RPCH_SND_OF_WRK);

&EMPLID = GetRow().KL_RPNH_CRD_TBL.EMPLID.Value;

&EFFDT = GetRow().KL_RPNH_CRD_TBL.KL_ATTENDANCE_DT.Value;

&KL_RPCH_FST_ST_WRK = GetRow().KL_RPNH_CRD_TBL.KL_RPCH_FST_ST_WRK.Value;

&KL_RPCH_FST_OF_WRK = GetRow().KL_RPNH_CRD_TBL.KL_RPCH_FST_OF_WRK.Value;

&KL_RPCH_SND_ST_WRK = GetRow().KL_RPNH_CRD_TBL.KL_RPCH_SND_ST_WRK.Value;

&KL_RPCH_SND_OF_WRK = GetRow().KL_RPNH_CRD_TBL.KL_RPCH_SND_OF_WRK.Value;

SQLExec("SELECT A.PUNCH_DTTM_1,A.PUNCH_DTTM_2,A.PUNCH_DTTM_3,A.PUNCH_DTTM_4 FROM PS_KL_ORGL_PNH_TBL A WHERE A.EMPLID = :1 AND A.KL_ATTENDANCE_DT = :2", &EMPLID, &EFFDT, &PUNCH_DTTM_1, &PUNCH_DTTM_2, &PUNCH_DTTM_3, &PUNCH_DTTM_4);

&KL_RPCH_FST_ST_WRK_FLD.Style = "PSEDITBOX";

&KL_RPCH_FST_OF_WRK_FLD.Style = "PSEDITBOX";

&KL_RPCH_SND_ST_WRK_FLD.Style = "PSEDITBOX";

&KL_RPCH_SND_OF_WRK_FLD.Style = "PSEDITBOX";

/*对比取补签时间段*/

If &KL_RPCH_FST_ST_WRK = "Y" And

      All(&PUNCH_DTTM_1) Then

   &KL_RPCH_FST_ST_WRK_FLD.Style = "PSERROR"; /*对错误的，显示红色*/

   &SHOW_ERROR_FLAG = "Y"

End-If;

If &KL_RPCH_FST_OF_WRK = "Y" And

      All(&PUNCH_DTTM_2) Then

   &KL_RPCH_FST_OF_WRK_FLD.Style = "PSERROR";

   &SHOW_ERROR_FLAG = "Y"

End-If;

If &KL_RPCH_SND_ST_WRK = "Y" And

      All(&PUNCH_DTTM_3) Then

   &KL_RPCH_SND_ST_WRK_FLD.Style = "PSERROR";

   &SHOW_ERROR_FLAG = "Y"

End-If;

If &KL_RPCH_SND_OF_WRK = "Y" And

      All(&PUNCH_DTTM_4) Then

   &KL_RPCH_SND_OF_WRK_FLD.Style = "PSERROR";

   &SHOW_ERROR_FLAG = "Y"

End-If;

理解：首先这里定义的 &KL_RPCH_SND_OF_WRK_FLD.Style = "PSERROR"，它是根据page的stylesheet来的，一般来说，我们建好page之后，page的style是默认的，那个这个默认的stylesheet名称叫：PSSTYLEDEF，在ADD打开它之后，发现里面有很多样式定义，其中就有“PSERROR ”，“PSEDITBOX”的样式定义。 peoplebook：http://docs.oracle.com/cd/E13292_01/pt849pbr0/eng/psbooks/tapd/chapter.htm?File=tapd/htm/tapd17.htm