apex:actionPoller In Visualforce Page
In this blog we are going to learn about <apex:actionPoller> in visualforce page. It sends the Ajax request to the server periodically according to specified time interval . Let’s see an example, how it works.
Attribute
Before going further let’s see some attributes of <apex:actionPoller> which we are going to use in the example.
- action : The action method which is invoked by AJAX request periodically.
- interval : Time interval between two ajax call. It must be greater than or equal to 5 sec. Default value is 60 sec .
- reRender : Id of the component which should be updated after completion of AJAX request.
Note : For further attribute reference please go through Salesforce Documentation.
Example
In this example we are going change the name of fruit in particular interval of time.
# Visualforce Page
<apex:page controller="exampleCon" sidebar="false"> <!-- /** * Webkul Software. * * @category Webkul * @author Webkul * @copyright Copyright (c) 2010-2016 Webkul Software Private Limited (https://webkul.com) * @license https://store.webkul.com/license.html */ --> <apex:form > <apex:outputText value="Watch the changing fruit: {!count} : {!currentFruit}" id="counter"/> <apex:actionPoller action="{!incrementCounter}" reRender="counter" interval="6"/> </apex:form> </apex:page>
# Apex Class:
public class exampleCon { /** * Webkul Software. * * @category Webkul * @author Webkul * @copyright Copyright (c) 2010-2016 Webkul Software Private Limited (https://webkul.com) * @license https://store.webkul.com/license.html */ private List<String> fruitList = new List<String>(); Integer count = 0; // Fruit name to be displayed public String currentFruit { get{ currentFruit = fruitList[count]; return currentFruit; } set; } // Increment the counter value public PageReference incrementCounter() { if(count< 6) { count++; } else { count = 0; } return null; } public Integer getCount() { return count; } // Constructor define the list of fruits public exampleCon () { fruitList.add('Mango'); fruitList.add('Apple'); fruitList.add('Pineapple'); fruitList.add('Banana'); fruitList.add('Orange'); fruitList.add('Grape'); fruitList.add('Peach'); } }
Support
That’s all for <apex:actionPoller> in visualforce page, still if you have any further query feel free to contact us, we will be happy to help you https://wedgecommerce.com/contact-us/.