How To Display Error Message On Visualforce Page?

1.	How To Display Error Message On Visualforce Page?
Answer» In the Visualforce page add the TAG: &LT;apex:pageMessages /> In the controller class add the error MESSAGE where required if ( requiredFieldName == null){ ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Please enter a value in the Required FIELD')); } In the Visualforce page add the tag: <apex:pageMessages /> In the controller class add the error message where required if ( requiredFieldName == null){ ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Please enter a value in the Required Field')); }

Answer»

In the Visualforce page add the TAG:

&LT;apex:pageMessages />

In the controller class add the error MESSAGE where required

if ( requiredFieldName == null){

ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Please enter a value in the Required FIELD'));

}

In the Visualforce page add the tag:

<apex:pageMessages />

In the controller class add the error message where required

if ( requiredFieldName == null){

ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, 'Please enter a value in the Required Field'));

}

Discussion