[jsf-2] Can I update a JSF component from a JSF backing bean method?

Is there a way to have a JSF Backing bean cause an update of a component on the page? I am not looking to use an ajax component with update attribute to update a component on the page. I need to trigger an update from within a JSF backing bean method. Note the update on the page can happen after this method completes or prior to its completion. I am using PrimeFaces, if there is a solution that can be had from using PrimeFaces.

I also tried to update a component from a jsf backing bean/class

You need to do the following after manipulating the UI component:

FacesContext.getCurrentInstance().getPartialViewContext().getRenderIds().add(componentToBeRerendered.getClientId())

It is important to use the clientId instead of the (server-side) componentId!!

Everything is possible only if there is enough time to research :)

What I got to do is like having people that I iterate into a ui:repeat and display names and other fields in inputs. But one of fields was singleSelect - A and depending on it value update another input - B. even ui:repeat do not have id I put and it appeared in the DOM tree

<ui:repeat id="peopleRepeat"
value="#{myBean.people}"
var="person" varStatus="status">

Than the ids in the html were something like:

myForm:peopleRepeat:0:personType
myForm:peopleRepeat:1:personType

Than in the view I got one method like:

<p:ajax event="change"
listener="#{myBean.onPersonTypeChange(person, status.index)}"/>

And its implementation was in the bean like:

String componentId = "myForm:peopleRepeat" + idx + "personType";
PrimeFaces.current().ajax().update(componentId);

So this way I updated the element from the bean with no issues. PF version 6.2

Good luck and happy coding :)

The RequestContext is deprecated from Primefaces 6.2. From this version use the following:

if (componentID != null && PrimeFaces.current().isAjaxRequest()) {
    PrimeFaces.current().ajax().update(componentID);
}

And to execute javascript from the backbean use this way:

PrimeFaces.current().executeScript(jsCommand);

Reference:

• https://github.com/primefaces/primefaces/wiki/Migration-Guide
• https://forum.primefaces.org/viewtopic.php?t=53129