Using value binding expression for to-view-id
hi;
is it possible to use a value binding expression in the <to-view-id> element?
if not, is there a logical reason for this?
thanks
Shrek-2:
Are we there yet?No
Are we there yet?No
Are we there yet?Yes
Really?
NO
Seriously, the default navigation handler does not allow to use EL for the to-view-id, but you can obtain the desire behaviour with the custom handler decorator.
This is a code snippet:
public void handleNavigation(FacesContext fc, String actionMethod, String actionName) {
_base.handleNavigation(fc, actionMethod, actionName);
String viewId = fc.getViewRoot().getViewId();
if ((viewId.indexOf("#{") != -1) &&
(viewId.indexOf("#{") < viewId.indexOf('}'))) {
String bviewId = (String)fc.getApplication().createValueBinding(viewId).getValue(fc);
if (bviewId != null)
fc.getViewRoot().setViewId(bviewId);
else {
// you can throw the exception here
}More about HandlerDecorator:
http://www.jsftutorials.net/jsfNavigation/jsf-login-navigation-redirect.html
http://www.jsftutorials.net/faces-config/navigationDecorator.html
P.S. Note: This feature might broke the separation between the different levels of application from the architectural point of view. Hard-coding the ViewIds inside the java code is not a good idea at all.
Sergey : jsfTutorials.net
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SQL>Hence the questions about language above.
>
I am having a display only item -- :P2_FROM_Date . If its Thu,Fri,Sat or Sun I want to set the date as the last Monday's date . If its Mon,Tue or Wed then it should be the present Monday's date .
E.g: Today is Friday and the last Monday was on 18th .
So for yesterday , today,tomorrow and Sunday , the date should be displayed as 18-JUN-2012.
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>
The coming Monday is 25-JUN-2012.
Aren't these rules equivalent to "Monday this week, where Monday is the first day of the week"? In which case the PL/SQL Expression you require is:
trunc(sysdate, 'iw')For example:
SQL> with t as (
2 select date '2012-06-21' + level d from dual connect by level <= 17)
3 select
4 d
5 , trunc(d, 'iw') monday
6 from
7 t;
D MONDAY
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Sat 23-JUN-2012 Mon 18-JUN-2012
Sun 24-JUN-2012 Mon 18-JUN-2012
Mon 25-JUN-2012 Mon 25-JUN-2012
Tue 26-JUN-2012 Mon 25-JUN-2012
Wed 27-JUN-2012 Mon 25-JUN-2012
Thu 28-JUN-2012 Mon 25-JUN-2012
Fri 29-JUN-2012 Mon 25-JUN-2012
Sat 30-JUN-2012 Mon 25-JUN-2012
Sun 01-JUL-2012 Mon 25-JUN-2012
Mon 02-JUL-2012 Mon 02-JUL-2012
Tue 03-JUL-2012 Mon 02-JUL-2012
Wed 04-JUL-2012 Mon 02-JUL-2012
Thu 05-JUL-2012 Mon 02-JUL-2012
Fri 06-JUL-2012 Mon 02-JUL-2012
Sat 07-JUL-2012 Mon 02-JUL-2012
Sun 08-JUL-2012 Mon 02-JUL-2012
17 rows selected.
SQL> alter session set nls_territory='AMERICA';
Session altered.
SQL> alter session set nls_date_format='Dy DD-MON-YYYY';
Session altered.
SQL> with t as (
2 select date '2012-06-21' + level d from dual connect by level <= 17)
3 select
4 d
5 , trunc(d, 'iw') monday
6 from
7 t;
D MONDAY
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Thu 28-JUN-2012 Mon 25-JUN-2012
Fri 29-JUN-2012 Mon 25-JUN-2012
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Mon 02-JUL-2012 Mon 02-JUL-2012
Tue 03-JUL-2012 Mon 02-JUL-2012
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Thu 05-JUL-2012 Mon 02-JUL-2012
Fri 06-JUL-2012 Mon 02-JUL-2012
Sat 07-JUL-2012 Mon 02-JUL-2012
Sun 08-JUL-2012 Mon 02-JUL-2012
17 rows selected.Also note that using the item source properties will only set the <tt>P2_FROM_DATE</tt> in the rendered page, not in session state. -
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