I'm a beginner developer and I'm building a custom new contract button with a visualforce page with dropdown field values that unhide other fields depending on what is selected.
Clicking the button takes me to the visualforce page with no issues, but when I try to select a dropdown value (in this example "Yes" for Contract Questionnaire) it brings me to the error below...
Attempt to de-reference a null object Error is in expression '{!setContractorQuestionnaire}' in page societycontractrequestform: Class.SocietyContractRequest.setContractorQuestionnaire: line 24, column 1
Visualforce Page
<apex:page standardcontroller="Contract" extensions="SocietyContractRequest" recordSetVar="sobjects">
<Script>
function setFocusOnLoad() {}
</Script>
<apex:form >
<apex:pageMessages />
<apex:pageBlock id="contractBlock" title="Contract Request Form" >
<apex:pageBlockSection columns="1" id="ContractInfo" showHeader="true" title="Contract Information" collapsible="false">
<apex:inputField value="{!contract.Date_of_Request__c}" />
<apex:inputField value="{!contract.Requester_Name__c}" />
<apex:inputField value="{!contract.Project_Name__c}" />
<apex:inputField value="{!contract.Project_Number__c}" />
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="ContractorInfo" showHeader="true" title="Contractor Information" collapsible="false">
<apex:inputField value="{!contract.Contractor_Legal_First_Name__c}" />
<apex:inputField value="{!contract.Contractor_Legal_Last_Name__c}" />
<apex:inputField value="{!contract.Operating_Name__c}" />
<apex:inputField value="{!contract.Contractor_Street__c}" />
<apex:inputField value="{!contract.Contractor_City__c}" />
<apex:inputField value="{!contract.Contractor_State_Province__c}" />
<apex:inputField value="{!contract.Contractor_Zip_Postal_Code__c}" />
<apex:inputField value="{!contract.Contractor_Email_Address__c}" />
<apex:inputField value="{!contract.Contractor_Phone_Number__c}" />
<apex:inputField value="{!contract.Signing_Authority__c}" />
<apex:inputField value="{!contract.Sub_Contracting__c}" />
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="ContractorQuestionnaire" showHeader="true" title="Contractor Questionnaire" collapsible="false">
<apex:actionRegion >
<apex:inputField value="{!contract.Questionnaire_Complete__c}" >
<apex:actionSupport event="onchange" action="{!setContractorQuestionnaire}" reRender="ContractorQuestionnaire" />
</apex:inputField>
</apex:actionRegion>
<apex:inputField value="{!contract.Questionnaire_Completion_Date__c}" rendered="{!ContractorQuestionnaire}" />
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="ContractorIncorpInfo" showHeader="true" title="Contractor Incorporation Information" collapsible="false">
<apex:actionRegion >
<apex:inputField value="{!contract.Are_You_Incorporated__c}" >
<apex:actionSupport event="onchange" action="{!setContractorIncorpInfo}" reRender="ContractorIncorpInfo" />
</apex:inputField>
</apex:actionRegion>
<apex:inputField value="{!contract.Incorporation_Number__c}" rendered="{!ContractorIncorpInfo}"/>
<apex:inputField value="{!contract.Incorporation_Province_Territory__c}" rendered="{!ContractorIncorpInfo}"/>
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="WorkersCompInfo" showHeader="true" title="Workers Compensation Information" collapsible="false">
<apex:actionRegion >
<apex:inputField value="{!contract.Workers_Compensation_Status__c}" >
<apex:actionSupport event="onchange" action="{!setWorkersCompInfo}" reRender="WorkersCompInfo" />
</apex:inputField>
</apex:actionRegion>
<apex:inputField value="{!contract.Workers_Compensation_A_C_Number__c}" rendered="{!WorkersCompInfo}"/>
<apex:inputField value="{!contract.Workers_Compensation_Province_Territory__c}" rendered="{!WorkersCompInfo}"/>
<apex:inputField value="{!contract.Proof_of_Exemption_Uploaded__c}" rendered="{!WorkersCompInfoEX}"/>
<apex:inputField value="{!contract.Clearance_Certificate_Uploaded__c}" rendered="{!WorkersCompInfo}"/>
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="GSTHSTInfo" showHeader="true" title="GST/HST Information" collapsible="false">
<apex:actionRegion >
<apex:inputField value="{!contract.Do_you_have_a_GST_HST_Number__c}" >
<apex:actionSupport event="onchange" action="{!setGSTHSTInfo}" reRender="GSTHSTInfo" />
</apex:inputField>
</apex:actionRegion>
<apex:inputField value="{!contract.GST_HST_Number__c}" rendered="{!GSTHSTInfo}"/>
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="MonitorDeliverables" showHeader="true" title="Monitoring of Deliverables" collapsible="false">
<apex:inputField value="{!contract.Deliverables_Supervisor_Name__c}" />
<apex:inputField value="{!contract.Deliverables_Supervisor_Title__c}" />
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="SourceOfFunds" showHeader="true" title="Source of Funds" collapsible="false">
<apex:inputField value="{!contract.Source_Award_Code__c}" />
<apex:inputField value="{!contract.Source_Program_Area__c}" />
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="ContractValueInfo" showHeader="true" title="Contract Value Information" collapsible="false">
<apex:inputField value="{!contract.Fee_for_Service_Amount__c}" />
<apex:inputField value="{!contract.Fee_for_Service_Additional_Notes__c}" />
<apex:inputField value="{!contract.Expenses_Amount__c}" />
<apex:outputField value="{!contract.Total_Contract_Value__c}" />
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="ContextOfWork" showHeader="true" title="Context of Work" collapsible="false">
<apex:inputField value="{!contract.Context_of_Work__c}" />
</apex:pageBlockSection>
<apex:pageBlockSection columns="1" id="DescriptionOfWork" showHeader="true" title="Description of Work" collapsible="false">
<apex:inputField value="{!contract.Description_of_Work__c}" />
</apex:pageBlockSection>
</apex:pageBlock>
<apex:pageMessages />
<apex:commandButton action="{!saveForm}" value="Save Contract" />
<apex:commandButton action="{!cancelPage}" value="Cancel" immediate="true" />
</apex:form>
</apex:page>
Controller Extension...
public with sharing class SocietyContractRequest{
public Contract Contract {get;set;}
public Boolean ContractorQuestionnaire{get;set;}
public Boolean ContractorIncorpInfo{get;set;}
public Boolean WorkersCompInfo{get;set;}
public Boolean WorkersCompInfoEX{get;set;}
public Boolean GSTHSTInfo{get;set;}
private ApexPages.StandardSetController ssc;
private ApexPages.StandardController controller;
public SocietyContractRequest(ApexPages.StandardController controller){
this.controller = controller;
}
public SocietyContractRequest(ApexPages.StandardSetController controller){
this.ssc = controller;
}
//If Questionnaire Complete is Yes then render the Contractor Questionnaire detail fields
public void setContractorQuestionnaire(){
if (contract.Questionnaire_Complete__c == 'Yes' ){
ContractorQuestionnaire = true;
}else{
ContractorQuestionnaire = false;
}
}
//If Contractor Incorporated is Yes then render the Contractor Incorporation detail fields
public void setContractorIncorpInfo(){
if (contract.Are_You_Incorporated__c == 'Yes' ){
ContractorIncorpInfo = true;
}else{
ContractorIncorpInfo = false;
}
}
//If Workers Compensation Status is Yes then render the Contractor Questionnaire detail fields
public void setWorkersCompInfo(){
if (contract.Workers_Compensation_Status__c == 'Owns WC Account' ){
WorkersCompInfo = true;
WorkersCompInfoEX = false;
}else if (contract.Workers_Compensation_Status__c == 'Exempt from WC' ){
WorkersCompInfo = false;
WorkersCompInfoEX = true;
}else {
WorkersCompInfo = false;
WorkersCompInfoEX = false;
}
}
//If Questionnaire Complete is Yes then render the Contractor Questionnaire detail fields
public void setGSTHSTInfo(){
if (contract.Do_you_have_a_GST_HST_Number__c == 'Yes' ){
GSTHSTInfo = true;
}else{
GSTHSTInfo = false;
}
}
//Save page
public PageReference saveForm(){
system.debug('Saving Contract...');
upsert contract;
PageReference pageRef = new PageReference('/' + contract.Id);
pageRef.setRedirect(true);
return pageRef;
}
//Cancel and return to the CRA Activity Report page
public PageReference cancelPage(){
PageReference contractPage = new ApexPages.StandardController(contract).view();
contractPage.setRedirect(true);
return contractPage;
}
}
