jsf-2 – Page 4 – Tarik Billa

How do I process GET query string URL parameters in backing bean on page load?

August 19, 2023 by Tarik

Yes, you can use the <f:viewParam> to set a request parameter as a managed bean property. <f:metadata> <f:viewParam name=”companyId” value=”#{bean.companyId}” /> </f:metadata> You can if necessary invoke a bean action using <f:viewAction> (JSF 2.2+ only) or <f:event type=”preRenderView”>. <f:metadata> <f:viewParam name=”companyId” value=”#{bean.companyId}” /> <f:viewAction action=”#{bean.onload}” /> </f:metadata> When using <f:viewAction> you can even return a … Read more

Execution order of events when pressing PrimeFaces p:commandButton

August 18, 2023 by Tarik

It failed because you used ajax=”false”. This fires a full synchronous request which in turn causes a full page reload, causing the oncomplete to be never fired (note that all other ajax-related attributes like process, onstart, onsuccess, onerror and update are also never fired). That it worked when you removed actionListener is also impossible. It … Read more

JSF doesn’t support cross-field validation, is there a workaround?

August 15, 2023 by Tarik

The easiest custom approach I’ve seen and used as far is to create a <h:inputHidden> field with a <f:validator> wherein you reference all involved components as <f:attribute>. If you declare it before the to-be-validated components, then you can obtain the submitted values inside the validator by UIInput#getSubmittedValue(). E.g. <h:form> <h:inputHidden id=”foo” value=”true”> <f:validator validatorId=”fooValidator” /> … Read more

How do you pass view parameters when navigating from an action in JSF2?

August 13, 2023 by Tarik

The unintuitive thing about passing parameters in JSF is that you do not decide what to send (in the action), but rather what you wish to receive (in the target page). When you do an action that ends with a redirect, the target page metadata is loaded and all required parameters are read and appended … Read more

Concatenating strings within EL expression defined in an attribute of a facelets tag

August 11, 2023 by Tarik

It is possible to concatenate Strings in EL using the java.lang.String.concat(String) method. Thus your code could look like: <h:outputText value=”#{cc.attrs.appreciatedByCurrentUser ? (”.concat(cc.attrs.count).concat(‘<br/>’).concat(cc.attrs.count-1)) : (”.concat((cc.attrs.count+1)).concat(‘<br/>’).concat(cc.attrs.count))}” escape=”false” /> In this particular case however I would go with one of the options that Mr BalusC had suggested because the code above doesn’t look quite elegant. In some cases … Read more

The form component needs to have a UIForm in its ancestry. Suggestion: enclose the necessary components within

August 7, 2023 by Tarik

This is just a Warning not an Error. Warnings are usually there to inform the developer about unforeseen situations/conditions which might not immediately cause technical errors/problems. Anything may just work flawlessly, but the behaviour/results may probably not be as the developer intented. A newbie developer may for example accidently have used <form> instead of <h:form>. … Read more

PrimeFaces commandButton doesn’t navigate or update

August 5, 2023 by Tarik

<p:commandButton> needs one of the following to work correctly: the update attribute to list id’s of components to re-render (for AJAX requests) the attribute ajax=”false” to make a normal, non-ajax submit. If you have neither, the button does per default an AJAX request with no UI feedback. Additionally, I’ve had problems with neither option working … Read more

Facelets repeat Tag Index

August 4, 2023 by Tarik

Specify a value for the “varStatus” attribute: <ui:repeat id=”…” var=”…” value=”…” varStatus=”myVarStatus”> You can then access the loop index via EL: #{myVarStatus.index} Additionally, the following properties are available to the varStatus: begin of type Integer end of type Integer index of type int step of type Integer even of type boolean odd of type boolean … Read more

Difference between h:link and h:outputLink

August 1, 2023 by Tarik

<h:link> uses its value attribute as the link text and its outcome attribute to generate the linked-to URL via JSF navigation rules. This makes it useful for application-internal links. Also, this component was introduced only on JSF 2.0 <h:outputLink> uses the value attribute directly as linked-to URL and the content of the tag as link … Read more

How to set width of a p:column in a p:dataTable in PrimeFaces 3.0?

August 1, 2023 by Tarik

In PrimeFaces 3.0, that style get applied on the generated inner <div> of the table cell, not on the <td> as you (and I) would expect. The following example should work out for you: <p:dataTable styleClass=”myTable”> with .myTable td:nth-child(1) { width: 20px; } In PrimeFaces 3.5 and above, it should work exactly the way you … Read more