primefaces poll dynamic interval

Question

I wrote example code like this :

@ViewScoped
@Named
public class SampleBean implements Serializable {

    private int interval = 1;


    public void execute() {
        switch (interval) {
            case 1:
                System.out.println("1 Executed ...");
                break;
            case 2:
                System.out.println("2 Executed ...");
                break;
            case 3:
                System.out.println("3 Executed ...");
                break;
        }
    }

    public int getInterval() {
        return interval;
    }

    public void setInterval(int interval) {
        this.interval = interval;
    }
}

and this xhtml :

<h:form>
        <p:selectOneButton value="#{sampleBean.interval}">
            <f:selectItem itemLabel="1" itemValue="1"/>
            <f:selectItem itemLabel="2" itemValue="2"/>
            <f:selectItem itemLabel="3" itemValue="3"/>
        </p:selectOneButton>

        <p:poll interval="#{sampleBean.interval}" listener="#{sampleBean.execute}" id="poll"/>

    </h:form>

I want to update interval time of primefaces poll component dynamically but not changed with my example code . sleep always executed every 1 second .
What is wrong in my code ?

Adam Waldenberg Adam Waldenberg · Accepted Answer · 2019-02-16T12:55:19

You need to tell the p:poll component to refetch it's backing bean values. You can easily accomplish this by invoking a new rendering phase (via PrimeFaces update or via f:ajax render) on the component.

So to make it work, you just have to do something like this,

<h:form>
    <p:selectOneButton value="#{sampleBean.interval}">
        <f:selectItem itemLabel="1" itemValue="1"/>
        <f:selectItem itemLabel="2" itemValue="2"/>
        <f:selectItem itemLabel="3" itemValue="3"/>
        <f:ajax render="@form"/>
    </p:selectOneButton>
    <p:poll interval="#{sampleBean.interval}" listener="#{sampleBean.execute}" id="poll"/>
</h:form>

Notice the f:ajax invocation above.

You need to target the enclosing (parent) component to get it to refresh - this is why we are targeting the form instead of the poll component directly.

primefaces poll dynamic interval

1 Answers