Vf ppt (1)

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Vf ppt (1)

  1. 1. Agenda  Visualforce Overview  Visualforce Benefits  Visualforce Page Architecture
  2. 2. Visualforce System Architecture (Development Mode)
  3. 3. Visualforce System Architecture (User Mode)
  4. 4. Visualforce benefits  User-friendly development  Integration with other Web-based user interface technologies  Model-View-Controller (MVC) style development  Concise syntax  Automatically upgradeable
  5. 5. Model View Controller Pattern
  6. 6. Visualforce – MVC Breakdown
  7. 7. Developers can use Visualforce pages to:  Override standard buttons, such as the New button for accounts, or the Save button for contacts  Override tab overview pages, such as the Accounts tab home page  Define custom tabs  Create dashboard components or custom help pages  Customize, extend, or integrate the sidebars in the Service Cloud console (custom console components)
  8. 8. Displaying Field Values with Visualforce Visualforce pages use the same expression language as formulas—that is, anything inside {! } is evaluated as an expression that can access values from records that are currently in context. For example, you can display the current user's first name by adding the {! $User.FirstName} expression
  9. 9. Controllers A Visualforce controller is a set of instructions that specify what happens when a user interacts with the components specified in associated Visualforce markup, such as when a user clicks a button or link. Controllers also provide access to the data that should be displayed in a page, and can modify component behavior. Types of Controllers :1. Standard Controller 2. Custom Controller 3. Extension
  10. 10. Controllers Visualforce markup can use the following types of controller extension and custom controller methods: • Action • Getter • Setter
  11. 11. Order of Execution in a Visualforce Page There are two types of Visualforce page requests: • A get request is an initial request for a page either made when a user enters an URL or when a link or button is clicked that takes the user to a new page. • A postback request is made when user interaction requires a page update, such as when a user clicks on a Save button and triggers a save action.
  12. 12. Order of Execution in a Visualforce Page get request.
  13. 13. Order of Execution in a Visualforce Page Post Request.
  14. 14. Using JavaScript and CSS in Visualforce Pages Using JavaScript in Visualforce pages gives you access to a wide range of existing JavaScript functionality,
  15. 15. Some Tags of VisualForce :1. <apex:page> calls an action when the page is loaded 2. <apex:actionFunction> defines a new JavaScript function that calls an action 3. <apex:stylesheet value="{!$Resource.<filename>}"/> 4. <apex:outputText> 5. <apex:commandButton> creates a button that calls an action 6. <apex:commandLink> creates a link that calls an action 7. <apex:actionSupport> makes an event (such as “onclick”, “onmouseover”, and so on) on another, named component, call an action.
  16. 16. Some Tags of VisualForce :8. <apex:pageBlock > 9. <apex:pageBlockTable value="{!accounts}" var="a"> 10. <apex:column value="{!a.name}"/> 11. <apex:form id="theForm">
  17. 17. Demos

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