Action Poller in Visualfoce Page

According to SF documentation, It is

A timer that sends an AJAX request to the server according to a time interval that you specify. Each request can result in a full or partial page update.

Examples :

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1. After certain amount of time, you want to perform specific event.

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2. From Apex if you want to get continuous status of batch and then you want to execute specific task.

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3. If you want to split transactions for doing multiple activities.

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Document from salesforce is here.

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Let’s understand this by below example.

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We will print the Booking Status. This sample page will poll the server for getting current status while displaying the specific message “Booking Your Tickets…” when action poller executes.

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When the status changed to Booked we want to terminate the action poller.

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Live demo available here.

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Apex Class :

public with sharing class BookingPollerContrl { // the payment statuses n    public List < String > statuses = new List < String > {n        'Connecting to IRCTC',n        'Authorising',n        'Authorised',n        'Booked'n    };n    // the index of the current Status n    private Integer currentStatusIdx = 0; // getter to retrieve the current Status n    public String getBookingStatus() {n        return statuses[currentStatusIdx];n    }n    // action method invoked by the poller - increments the n    // current Status index n    public PageReference changeBookingStatus() {n        currentStatusIdx++;n        return null;n    }n}n 

Visualforce Page :

n   n   n      n          n         n         n            The status of your Booking is : n            n         n         
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n         n      n   nn

#apex #Visualforce