Using JSF2 and richfaces 4.
I have two regions in my form with multiple regions. I want to call render for another region. How can I do it?
<h:form>
<a4j:region id="rg_1">
<h:inputText id="field1" value="#{bean.field1}"/>
</a4j:region>
<a4j:region id="rg_2">
<a4j:commandLink action="#{mybean.resetBean} render="region1" />
</a4j:region>
</h:form>
h:commandLink does not have render attribute , f:ajax does...
If you want to re render rg_1 from within rg_2 without page refresh (ajax)
do the following
<a4j:region id="rg_2">
<a4j:commandLink action="#{mybean.resetBean}" render="rg_1"/>
</a4j:region>
also make sure that mybean.resetBean method is a void method or returns null
Related
I have a button to submit a form and invoke a managed bean action.
<h:form>
...
<h:commandButton value="Submit" action="#{bean.submit}" />
</h:form>
But when I press the button it refreshes the whole page and sometimes also changes the URL.
Is there some way to not refresh the page and still invoke the action?
Make use of Ajax. It's a matter of nesting <f:ajax> inside the command button of interest.
<h:form>
...
<h:commandButton ...>
<f:ajax execute="#form" render="#none" />
</h:commandButton>
</h:form>
Particularly the render="#none" (which is the default value anyway, you could just omit the attribute altogether) will instruct JSF to re-render just nothing after the submit. If you intend to re-render only a specific component instead of the whole page, then you could also specify the ID of that specific component in render attribute.
<h:form>
...
<h:commandButton ...>
<f:ajax execute="#form" render="result" />
</h:commandButton>
...
<h:panelGroup id="result">...</h:panelGroup>
</h:form>
If you're already using PrimeFaces, then it's a matter of simply using <p:commandButton> instead of <h:commandButton>. It uses by default ajax already, so you don't need to nest in a <f:ajax>. You only need to remember to use attribute names process and update instead of execute and render.
<h:form>
...
<p:commandButton ... update="result" />
...
<h:panelGroup id="result">...</h:panelGroup>
</h:form>
The execute attribute defaults to #form already, so it could be omitted.
See also:
Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes
How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"
Why do I need to nest a component with rendered="#{some}" in another component when I want to ajax-update it?
I have next a4j:jsFunction
<a4j:jsFunction name="renderOnBusinessErrorEvent" execute="#none" bypassUpdates="true" immediate="true"
render="securityForm">
</a4j:jsFunction>
and JSF form with some dialog inside
<h:form id="securityForm">
<h:panelGroup rendered="#{someCondition}">
......
</h:panelGroup>
</h:form>
In my business logic it has to be executed twice consequently. In the first time all is fine. Rendered method is invoked and the expected dialog is present on the page. In the second time rendered method is not invoked, but model has been changed and I expect that dialog will not be present on the page. I supposed that it's some richfaces issue and I tried to use f:ajax
<a4j:jsFunction name="renderOnBusinessErrorEvent" execute="#none" bypassUpdates="true" immediate="true">
<f:ajax event="begin" render=":securityForm"/>
</a4j:jsFunction>
but unsuccessfully. Rendered method still not invoked in the second time. What is it? Some JSF optimization or bug? What's the workaround?
JSF version 2.1.19
The problem was in <h:panelGroup rendered="#{someOtherCondition}">
over h:form which equals false after the first rendering (ON THE SERVER SIDE).
However, this panelGroup is not part of rendering. So, my code:
<h:panelGroup rendered="#{someOtherCondition}">
<h:form id="securityForm">
<h:panelGroup rendered="#{someCondition}">
......
</h:panelGroup>
</h:form>
</h:panelGroup>
<h:form>
<a4j:jsFunction name="renderOnBusinessErrorEvent" execute="#none" bypassUpdates="true" immediate="true"
render="securityForm">
</a4j:jsFunction>
</h:form>
Before calling renderOnBusinessErrorEvent() I'm changing the value of someOtherCondition from true to false, but I don't rerender this element. Actually, on the server side this element is already missing. Looks like it's JSF feature, but is it specificated somewhere?
Is it possible? if yes, how do i do it?
I need to rerender a <h:outputText> after an <a4j:commandLink> action is executed, both components are inside a modalpanel and that modalpanel is inside a
I tried:
<a4j:commandLink value="somevalue" id="someid" action="#{MyBean.myAction()}"
reRender="outputtextid">
<f:param name="paramid" value="paramvalue"/>
</a4j:commandLink>
Make sure your <h:outputText> is outside the form that contains the <a4j:commandLink> or else it will bind the value of the outputText with the actual value in the form, leading to odd behavior in your page.
<h:form>
<a4j:commandLink value="somevalue" id="someid" action="#{MyBean.myAction()}"
reRender="outputtextid">
<f:param name="paramid" value="paramvalue"/>
</a4j:commandLink>
</h:form>
<h:outputText value="#{MyBean.outputValue}" id="outputtextid" />
If you must have the <h:outputText> inside the form, you should consider updating the value using the oncomplete tag attribute in the commandLink that executes JavaScript code.
In case you want to show a message to the user, you can use <h:messages> or <rich:messages> tag component, this will be a better option than using an outputText.
I need some help in the below code
<h:commandButton id="WhatifButtonID" value="#{demandBean.dmdReviewScreenLabelVO.whatIf}" style="width:60px; height:22px;" actionListener="#{demandBean.whatif}" onclick="window.open('DemandTargetList.xhtml','whatif','width=460,height=280,top=150,left=350,resizable=no,scrollbars=no')" >
<f:ajax execute="#this" ></f:ajax>
</h:commandButton>
In the above case, the onclick attribute gets executed first followed by the actionlistener attribute. I wanted the actionListener attribute to get executed first followed by the onclick function, since the page that loads onclick needs to get certain values from the actionListener. Please let me know how to acheive the same. Thanks in Advance.
Just let <f:ajax> render a script on complete.
<h:commandButton value="#{demandBean.dmdReviewScreenLabelVO.whatIf}" actionListener="#{demandBean.whatif}">
<f:ajax execute="#this" render="popupScript" />
</h:commandButton>
<h:panelGroup id="popupScript">
<h:outputScript rendered="#{demandBean.whatifPressed}">
window.open('DemandTargetList.xhtml','whatif','width=460,height=280,top=150,left=350,resizable=no,scrollbars=no');
</h:outputScript>
</h:panelGroup>
wherein you set whatifPressed to true in the whatif() method.
PrimeFaces may help with this with the use of the <p:remoteCommand/> tag. You can then just use a plain old button to call the remoteCommand, then simply execute the window.open().
<p:remoteCommand name="viewSomething" actionListener="#{someActionIWantToExecuteBeforeOpeningWindow}" update="#this" process="#this"/>
<button onclick="viewSomething(); window.open('http://somewhere.com', 'windowName', 'height=924,width=723');">Click me!</button>
You can use it over lists of items if you call the javascript function it creates something unique.
I've seen a strange problem in my project. It's that <h:commandButton/> does not execute the action method.
<c:choose>
<c:when test="#{empty param.t}">
// HTML
</c:when>
<c:when test="#{param.t eq 'normal'}">
// HTML
<h:form>
<h:commandButton value="ADD" action="#{addBean.doSomething}" />
</h:form>
<c:when>
</c:choose>
When I move <h:form> into first c:when, then the action method is called. Otherwise, it isn't. Why?
I'll ignore the syntax error in your EL (a missing }).
The command button won't be executed when #{param.t eq 'normal'} evaluates to false at the point the form submit request is to be processed. You need to maintain the same parameter for the subsequent request so that the button will be rendered so that JSF can confirm that the enduser is allowed to invoke the action. You can do this by adding a <f:param>:
<h:form>
<h:commandButton value="ADD" action="#{addBean.doSomething}">
<f:param name="t" value="#{param.t}" />
</h:commandButton>
</h:form>
Note that this is supported since JSF 2.0 only. On JSF 1.x you'd need to replace h:commandButton by a h:commandLink if you want f:param support.
Unrelated to the concrete problem, you should try to avoid JSTL as much as possible in your JSF views. If the intent is to render view parts conditionally (not to build view parts conditionally), then you should rather be using the JSF component's rendered attribute instead of a JSTL <c:choose> or <c:if>:
<h:panelGroup rendered="#{empty param.t}">
// HTML
</h:panelGroup>
<h:panelGroup rendered="#{param.t eq 'normal'}">
// HTML
<h:form>
<h:commandButton value="ADD" action="#{addBean.doSomething}" />
</h:form>
</h:panelGroup>