Category: visualforce

Last night(July 17th, 2019) while preparing for Platform Developer II certification, I was going through my notes to revise the different ways to call Apex Controller functions from Visualforce page, I thought of making a post regarding actionRegion, actionFunction, actionSupport, actionPoller & actionStatus. Just setting the expectation beforehand – It is not a post which will explain you all, but I will share the developer guide link for each of them so that you can go and read them (highly recommended).actionRegionThe specifies the components to be processed on Force.com server. Without this tag, the whole page will be processed. With actionRegion also the whole form is submitted, but only the part within the tag will be processed.It needs a reRender attribute to be effective. It will only refresh the part of the page using the data contained within the tag. This can be very effectively used to avoid validation errors that may occur due to present of standard validation rule in VF page like required attribute.Here is the example without ActionRegion:Controller:public with sharing class WithoutActionRegionController { public String valueEntered{get;set;} public String country{get;set;} public String state{get;set;} public WithoutActionRegionController() { country = ”; state = ”; valueEntered = ”; } public PageReference countrySubmitted(){ valueEntered = ‘Country: ‘ + country; return null; }}Visualforce Page:<apex:page controller=”WithoutActionRegionController”> <apex:form id=”myForm”> <apex:pageMessages id=”messages1″/> <apex:pageBlock id=”topPageBlock”> <apex:pageBlockSection columns=”2″ title=”Country & State”> <apex:outputText value=”Enter Country” /> <apex:inputText value=”{!country}” > <apex:actionSupport...