apex:actionPollar tag in visualforce page

actionpoller tag in salesforce

actionPoller

What is actionPoller tag? This tag specifies a timer that sends an AJAX update request at specified interval. Minimum interval time to refresh is 5 sec.

Here in this post i am providing a simple example to explain about actionPoller. I am calling a simple method from controller to display Date & TIme and recalling that method by using actionPoller tag to change the time for every 5 sesc. See the below code to understand how actionPoller will work.

Visualforce page Code:

<apex:page controller="actionpollerDemoController">
    <apex:form >
        <apex:pageBlock id="pb">
             <apex:actionPoller action="{!dateTimeMethod}" reRender="pb" interval="5"/>
                     Hello!!!  Date and Time: {!dateAndTime} 
                     <p>Note: Time will refresh fror eevry 5 sec.</p>
         </apex:pageBlock>
      </apex:form>
</apex:page>

Apex Controller:

Public with sharing class actionpollerDemoController {

Public DateTime dateAndTime{get;set;}

Public void dateTimeMethod(){
dateAndTime = System.now();
}
}

OutPut: In below screen rounded part will refresh for every 5 secs