Update ui components from server event

问题

How would I go about updating a UI component when a server process finishes or anytime else for that matter?

Can\Should I

• extend the UI component and register some kind of EventListener on it?
• bind the UI component in a backing bean?
• use some of the new PrimePush features?
• something else?

If anyone could guide me in the right direction I'd appreciate it.

Example Case One

Server process ends and updates the database.
I want to automatically update a DataTable with new rows based on the new information.
I don't want to poll for the new data.

EDIT

I want to update the UI component (a primefaces datatable) from an EJB Stateless Bean

回答1:

You didnt mention which version of primefaces you are using but you can update components from backed bean with addpartialupdatetarget.

RequestContext context = RequestContext.getCurrentInstance();
context.addPartialUpdateTarget("myForm:myComponent");

回答2:

You can just use the update attribute of your commandButton or whatever else you're using.

Something like this should work

<p:dataTable value="#{backer.bean}" id="table">
  // columns with data
</p:dataTable>

<p:commandButton actionListener="#{backer.updateDB}" update="table" />

来源：https://stackoverflow.com/questions/11656415/update-ui-components-from-server-event