Visualforce Developer Guide

Introducing Visualforce
Tools for Visualforce Development
Getting a Quick Start with Visualforce
Customizing the Appearance and Output of Visualforce Pages
Standard Controllers
Standard List Controllers
Custom Controllers and Controller Extensions
Live Controller (Pilot)
Advanced Examples
Overriding Buttons, Links, and Tabs with Visualforce
Using Static Resources
Creating and Using Custom Components
Dynamic Visualforce Bindings
Dynamic Visualforce Components
Integrating Email with Visualforce
Visualforce Charting
Creating Maps with Visualforce
Render Flows with Visualforce
Templating with Visualforce
Developing Salesforce Apps with Visualforce
Adding Visualforce to a Salesforce AppExchange App
Using JavaScript in Visualforce Pages
Communicating Across the DOM with Lightning Message Service
Best Practices
Standard Component Reference
Appendices
Global Variables, Functions, and Expression Operators
Security Tips for Apex and Visualforce Development
Apex Classes Used in Visualforce Controllers
ApexPages Class
ApexPages Methods
addMessage(message)
addMessages(exceptionThrown)
currentPage()
getMessages()
hasMessages()
hasMessages(severity)
Action Class
Cookie Class
IdeaStandardController Class
IdeaStandardSetController Class
KnowledgeArticleVersionStandardController Class
Message Class
PageReference Class
SelectOption Class
StandardController Class
StandardSetController Class
Execution Governors and Limits
Glossary
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hasMessages(severity)

Returns true if messages of the specified severity exist, false otherwise.

Signature

public Boolean hasMessages(ApexPages.Severity severity)

Parameters

sev
Type: ApexPages.Severity

Return Value

Type: Boolean