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1. Re: applets and ajax do not mix?
reREnder not the part of the page with applet but just concrete components.
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2. Re: applets and ajax do not mix?
Seeming silly question with a straight forward simple answer, but reality is a bit more twisted and devious.
The issue was traced to <h:panelGroup> where the layout attribute is not specified (or specified as something other than "block"). In the test case below the panelGroup element is not rendered as a "div" because of the "layout" attribute. As a consequence each time the "cba2" AJAX request occurs the applet is destroyed and restarted.
If the single change is made where the panelGroup is layout="block" the applet is *NOT* destroyed and restarted.
The issue has impact beyond applets. With panelGroup JSF elements rendered as html span elements on AJAX updates a scrolling page ends up always reverting to the top of the display. It is almost like a non-AJAX update. Very strange, but I'm sure there is a good explanation...<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:rich="http://richfaces.org/rich" xmlns:a4j="http://richfaces.org/a4j"> <head> <link rel="stylesheet" type="text/css" href="../CSS/common.css"/> </head> <ui:composition template="/templates/main.xhtml"> <ui:define name="title">LT:TestingErrors</ui:define> <ui:define name="body"> <div class="C-pageHeading">Error Handler Testing</div> <h:panelGroup id="pg" layout="not-block"> <h:form id="f"> <fieldset> <legend>Failing Actions</legend> <table> <tr> <td> <a4j:commandButton id="cba2" value="Ajax user error no traceback" reRender="f" actionListener="#{errors.actionListenerUserErrorNoTraceback}"/> </td> </tr> </table> </fieldset> </h:form> </h:panelGroup> <h:panelGroup id="foobar"> <applet id="foobarApplet" width="100%" height="200" codebase="/MAVEN" code="genomix.app.utility.StdGeneticMapApplet" archive=" gx/com/jgoodies/forms/1.2.1/forms-1.2.1.jar, gx-snapshot/genomix/legacy/GxLgStdGeneticMapApplet/1.0-SNAPSHOT/GxLgStdGeneticMapApplet-1.0-SNAPSHOT.jar, gx-snapshot/genomix/legacy/GxLgDB/1.0-SNAPSHOT/GxLgDB-1.0-SNAPSHOT.jar, gx-snapshot/genomix/legacy/GxLgGeneticMap/1.0-SNAPSHOT/GxLgGeneticMap-1.0-SNAPSHOT.jar, gx-snapshot/genomix/legacy/GxLgGraphics/1.0-SNAPSHOT/GxLgGraphics-1.0-SNAPSHOT.jar, gx-snapshot/genomix/legacy/GxLgSwing/1.0-SNAPSHOT/GxLgSwing-1.0-SNAPSHOT.jar, gx-snapshot/genomix/legacy/GxLgUtil/1.0-SNAPSHOT/GxLgUtil-1.0-SNAPSHOT.jar, gx/jal/jal/1.0/jal-1.0-double.jar, gx/jal/jal/1.0/jal-1.0-int.jar"> <param name="baseUrl" value="/lt/WS"/> <param name="map" value="IBM2Plus"/> <param name="marker" value="CSU454(GST)"/> <param name="delta" value="10.0"/> </applet> </h:panelGroup> </ui:define> </ui:composition> </html> -
3. Re: applets and ajax do not mix?
Hi,
Yes, FF shows exactly such behavior. It doesn't like non-inline elements inside inline (see W3C specs for more) - many symptoms were collected by community - slowdowns, unwanted scrolls, broken DOM structure... Just do no do that. -
4. Re: applets and ajax do not mix?
It seems like a mistake that by default panelGroup is not block level, especially when it is used so often for conditional rendering.
Could RichFaces provide a conditional rendering component when the condition would only need to be specified once, with one of two different blocks getting rendered based on true or false. Or even a switch case structure like rich tree nodes. This would eliminate non-structured looking views with:<h:panelGroup rendered="#{some EL expresssion}"> ... </h:panelGroup> <h:panelGroup rendered="#{not some EL expresssion}"> ... </h:panelGroup> -