Validation Rules and Custom Controllers
If a user enters data on a Visualforce page that uses a custom controller, and that data causes a validation rule error, the error can be displayed on the Visualforce page. Like a page that uses a standard controller, if the validation rule error location is a field associated with an <apex:inputField> component, the error displays there. If the validation rule error location is set to the top of the page, use the <apex:messages> component within the <apex:page> to display the error. However, to get the information to the page, the custom controller must catch the exception.
For example, suppose you have the following
page:
You
need to write a custom controller like the
following:
When the user saves the page, if a validation error is triggered, the exception
is caught and displayed on the page as they are for a standard controller.
<apex:page controller="MyController" tabStyle="Account">
<apex:messages/>
<apex:form>
<apex:pageBlock title="Hello {!$User.FirstName}!">
This is your new page for the {!name} controller. <br/>
You are viewing the {!account.name} account.<br/><br/>
Change Account Name: <p></p>
<apex:inputField value="{!account.name}"/> <p></p>
Change Number of Locations:
<apex:inputField value="{!account.NumberofLocations__c}" id="Custom_validation"/>
<p>(Try entering a non-numeric character here, then hit save.)</p><br/><br/>
<apex:commandButton action="{!save}" value="Save New Account Name"/>
</apex:pageBlock>
</apex:form>
</apex:page>
public class MyController {
Account account;
public PageReference save() {
try{
update account;
}
catch(DmlException ex){
ApexPages.addMessages(ex);
}
return null;
}
public String getName() {
return 'MyController';
}
public Account getAccount() {
if(account == null)
account = [select id, name, numberoflocations__c from Account
where id = :ApexPages.currentPage().getParameters().get('id')];
return account;
}
}