[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2469) add postback flag to page actions
[ http://jira.jboss.com/jira/browse/JBSEAM-2469?page=comments#action_12414169 ]
Stephen Friedrich commented on JBSEAM-2469:
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Hm, many of my pages are reachable both through get (search results links) and through
postbacks (navigating through a hierarchy).
I need to to implement both ways:
The first for bookmarkable links (or links from other places at our intranet to specific
products in my catalog app), the latter for usability and performance (using ajax to
update only relevant parts when for example a dropdown value is changed).
It seems to me that what this request really aims at, is to have the page action triggered
only once for the page.
Rather than having a special "postback" flag, could we have a mechanism instead
that automatically sets a flag in page context to indicate that the page action already
has been executed once, and check that if the option is true at the page action?
add postback flag to page actions
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Key: JBSEAM-2469
URL: http://jira.jboss.com/jira/browse/JBSEAM-2469
Project: Seam
Issue Type: Feature Request
Components: Core
Affects Versions: 2.0.1.CR1
Reporter: Dan Allen
Assigned To: Dan Allen
Fix For: 2.1.0.BETA2
Original Estimate: 1 hour
Remaining Estimate: 1 hour
Page actions are incredibly useful, but sometimes they can get in the way during a
postback. I would like to see a postback attribute added to the <action> tag that
can be used to disable the action on postback. It's possible using a conditional, but
it is ugly and a lot of typing.
Here is the logic that would go into Pages.java
private boolean isPostBack(FacesContext facesContext)
{
return facesContext.getExternalContext().getRequestParameterMap().
containsKey(ResponseStateManager.VIEW_STATE_PARAM);
}
The conditional alternative would be:
<action execute="#{component.action}" if="#{empty
param['javax.faces.ViewState']}"/>
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