ColdBox HMVC Documentation
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5.x
5.x
  • Introduction
  • Intro
    • Introduction
      • What's New With 5.6.0
      • What's New With 5.5.0
      • What's New With 5.4.0
      • What's New With 5.3.0
      • What's New With 5.2.0
      • What's New With 5.1.4
      • What's New With 5.1.3
      • What's New With 5.1.2
      • What's New With 5.1.1
      • What's New With 5.1.0
      • What's New With 5.0.0
      • Upgrading to ColdBox 5
      • About This Book
      • Author
  • For Newbies
    • 60 Minute Quick Start
      • Installing ColdBox
      • My First ColdBox Application
      • My First Handler & View
      • Linking Events Together
      • Working With Event Handlers
      • Adding A Layout
      • Adding A Model
      • RESTFul Data
      • Next Steps
  • Getting Started
    • Getting Started Guide
    • Installation
    • Conventions
    • Configuration
      • ColdBox.cfc
        • Configuration Directives
          • CacheBox
          • ColdBox
          • Conventions
          • Environments
          • Flash
          • InterceptorSettings
          • Interceptors
          • Layouts
          • LayoutSettings
          • LogBox
          • Modules
          • ModuleSettings
          • Settings
          • WireBox
        • System Settings (Java Properties and Environment Variables)
      • Using Settings
      • Bootstrapper - Application.cfc
  • The Basics
    • Request Context
    • Routing
      • Requirements
        • Rewrite Rules
      • Application Router
      • Routing DSL
        • Routing By Convention
        • Pattern Placeholders
        • Routing Methods
        • Resourceful Routes
        • Named Routes
        • Routing Groups
        • Routing Namespaces
      • Building Routable Links
      • RESTFul Extension Detection
      • HTTP Method Spoofing
      • HTML Base Tag
      • Pathinfo Providers
    • Event Handlers
      • How are events called?
      • Getting & Setting Values
      • Setting Views
      • Relocating
      • Rendering Data
      • Sending Files
      • Interception Methods
        • Pre Advices
        • Post Advices
        • Around Advices
      • Model Integration
        • Model Data Binding
      • HTTP Method Security
      • Implicit Methods
      • Executing Events
      • Executing Routes
      • Viewlets - Reusable Events
      • Event Caching
      • Validation
    • Layouts & Views
      • Views
        • Rendering Views
        • Rendering External Views
        • Rendering With Local Variables
        • Rendering Collections
        • View Caching
        • View Helpers
        • View Events
      • Layouts
        • Basic Layouts
        • Default Layout
        • Nested Layouts
        • Overriding Layouts
        • Layouts From A Module
        • Layout Helpers
        • Layout Events
      • Implicit Layout-View Declarations
      • Helpers UDF's
      • ColdBox Elixir
    • Models
      • Domain Modeling
        • Service Layer
        • Data Layers
        • Book
      • Conventions Location
      • WireBox Binder
      • Super Type Usage Methods
      • Injection DSL
        • Model Object Namespace
        • ColdBox Namespace
        • CacheBox Namespace
        • LogBox Namespace
        • WireBox Namespace
        • EntityService Namespace
      • Object Scopes
      • Coding: Solo Style
        • Datasource
        • Contact.cfc
        • ContactDAO.cfc
        • ContactService.cfc
        • Contacts Handler
      • Coding: ActiveEntity Style
        • ORM
        • Contact.cfc
        • Contacts Handler
        • Views
      • Coding: Virtual Service Layer
        • ORM
        • Contacts.cfc
        • Contacts Handler
        • Views
      • Coding: ORM Scaffolding
        • ORM
        • Contacts.cfc
        • Scaffold
  • HMVC
    • Modules
      • Core Modules
      • Locations
      • Parent Configuration
      • Module Layout
        • Changing The Module Layout
      • Module Service
        • Module Lifecycle
        • Module Registration
        • Module Activation
        • Module Unloading
        • Common Methods
        • Loading New Modules
        • Loading A-la-carte Modules
        • Module Events
      • ModuleConfig
        • Public Module Properties\/Directives
        • The Decorated Variables
        • The configure() Method
        • Module Settings
        • Environment Control
        • Interceptor Events
      • Module Event Executions
      • URL Routing
        • Default Route Execution
        • Module Routes Files
      • Request Context Module Methods
      • Layout and View Renderings
        • Layout\/View Discovery
        • Overriding Views
        • Overriding Layouts
        • Default Module Layout
        • Explicit Module Renderings
      • Models
      • Module CF Mappings
      • Module Dependencies
      • Module Helpers
      • Module Bundles
      • Module Inception
  • Testing
    • Testing Quick Start
    • Testing ColdBox Applications
      • Test Harness
      • ColdBox Testing Classes
      • Integration Testing
        • Test Annotations
        • Common Methods
        • Life-Cycle Events
        • Test Setup
        • The execute() Method
        • The Handler To Test
        • The Integration Test
        • Handler Returning Results
        • Testing Without Virtual Application
        • Rendering Results
        • HTTP Method Mocking
      • Interceptor Testing
      • Model Object Testing
      • Tips & Tricks
  • Digging Deeper
    • Interceptors
      • How do they work?
        • Conventions
      • Interceptor Declaration
      • Interceptor Registration
      • Core Interception Points
        • Application Life Cycle Events
        • Object Creating Events
        • Layout-View Events
        • Module Events
        • CacheBox Events
      • Restricting Execution
      • Interceptor Output Buffer
      • Custom Events
        • Configuration Registration
        • Programmatic Registration
        • Listening
        • Announcing Interceptions
      • Unregistering Interceptors
      • Reporting Methods
      • Interceptor Asynchronicity
        • Async Announcements
        • Async Listeners With Join
        • Async Listeners No Join
        • Asynchronous Annotations
    • Flash RAM
      • Flash Storage
      • Using Flash RAM
      • Creating Your Own Flash Scope
    • HTML Helper
    • ColdBox Proxy
      • Getting Started
      • The Base Proxy Object
      • The Event Handlers
        • Distinguishing Request Types
        • RenderData()
      • Proxy Events
      • Standard Return Types
      • Caveats & Gotchas
    • Request Context Decorator
    • Controller Decorator
    • Recipes
      • Building REST APIs
      • Application Templates
      • ColdBox Exception Handling
      • Debugging ColdBox Apps
      • Clearing the View Cache
      • Building a simple Basic HTTP Authentication Interceptor
  • Architecture Concepts
    • What is MVC
    • What is ColdBox
    • How ColdBox Works
    • Testing Concepts
      • Functional Testing
      • Non-Functional Testing
      • Bugs Cost Money
      • Static Testing
      • Dynamic Testing
      • Developer Focus
      • Testing Vocabulary
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  1. The Basics
  2. Event Handlers

Getting & Setting Values

Last updated 6 years ago

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We all need values in our applications. That is why we interact with the in order to place data from our model layer into it so our views can display it, or to retrieve data from a user's request. You will either interact with the event object to get/set values or put/read values directly via the received rc and prc references.

We would recommend you use the private request collection (prc) for setting manual data and using the standard request collection (rc) for reading the user's unsafe request variables. This way a clear distinction can be made on what was sent from the user and what was set by your code.

//set a value for views to use
event.setValue( "name", "Luis" );
event.setPrivateValue( "name", "Luis" );

// retrieve a value the user sent
event.getValue( "name" );
// retrieve a value the user sent or give me a default value
event.getValue( "isChecked", false );

// retrieve a private value
event.getPrivateValue( "name" );
// retrieve a private value or give me a default value
event.getPrivateValue( "isChecked", false );

// param a value
event.paramValue( "user_id", "" );
// param a private value
event.paramPrivateValue( "user_id", "" );

// remove a value
event.removeValue( "name" );
// remove a private value
event.removePrivateValue( "name" );

//check if value exists
if( event.valueExists( "name" ) ){

}
//check if private value exists
if( event.privateValueExists( "name" ) ){

}

// set a view for rendering
event.setView( 'blog/index' );

// set a layout for rendering
event.setLayout( 'main' );

// set a view and layout
event.setView( view="blog/userinfo", layout="ajax" );

Important The most important paradigm shift from procedural to an MVC framework is that you NO LONGER will be talking to URL, FORM, REQUEST or any ColdFusion scope from within your handlers, layouts, and views. The request collection already has URL, FORM, and REQUEST scope capabilities, so leverage it.

request context
RC/PRC Data Super Highway