CODEWITHSUNDEEP
jsf-2rendering
Ouerghi Yassine
Ouerghi Yassine

Reputation: 1887

Render or update a page while still running inside a method

I was wondering if you could render or update a page while you still inside a method; here is an example: the .xhtml file: 

<h:form id="form">
    <h:commandButton value="change" actionListener="#{bean.changeText}">
        <f:ajax render="out" />
    </h:commandButton>
    <h:outputLabel id="out" value="#{bean.text}" />
</h:form>

and here is the changeText Method: 

public void changeText() throws InterruptedException{
    text = "test1"; 
    FacesContext.getCurrentInstance().renderResponse();
    Thread.sleep(2000);
    text = "test2";
}

Now is it possible to set the output label (id = out) to be rendered (or changed) to "test1", then after the 2 second have elapsed it changes to "test2"? Well looking at the JSF life cycle i thought it isnt possible, but maybe i got the life cycle wrong, or one of you guys know a work around.

Upvotes: 0

Views: 147

Answers (1)

BalusC
BalusC

Reputation: 1109112

No, that's not possible. The render response only starts once the action method returns.

There are basically 2 ways to achieve the desired behavior: polling or pushing. Based on your question history, you're using Java EE 7 + JSF 2.2 + PrimeFaces. You could for pushing use PrimeFaces <p:socket> or homegrow one using Java EE 7's new WebSocket API (JSR-356).

Upvotes: 1

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