Book Image

Visualforce Development Cookbook - Second Edition

By : Keir Bowden
Book Image

Visualforce Development Cookbook - Second Edition

By: Keir Bowden

Overview of this book

Visualforce is a framework that allows developers to build sophisticated, custom user interfaces that can be hosted natively on the Force.com platform. The Visualforce framework includes a tag-based markup language, similar to HTML that is used to write the Visualforce pages and a set of controllers that are used to write business logic to the Visualforce pages. Visualforce Development Cookbook provides solutions to a variety of challenges faced by Salesforce developers and demonstrates how easy it is to build rich, interactive pages using Visualforce. Whether you are looking to make a minor addition to the standard page functionality or override it completely, this book will provide you with the help you require throughout. You will start by learning about the simple utilities and will build up to more advanced techniques for data visualization and to reuse functionality. You will learn how to perform various tasks such as creating multiple records from a single page, visualizing data as charts, using JavaScript to enhance client-side functionality, building a public website, and making data available to a mobile device. With an interesting chapter on tackling common issues faced while developing Visualforce pages, the book provides lots of practical examples to enhance and extend your Salesforce user interface.
Table of Contents (16 chapters)
Visualforce Development Cookbook - Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface

Reducing view state size 1 - the transient keyword


The Visualforce view state is used to maintain the state of a page across multiple requests to the server. If a Visualforce page contains an <apex:form /> tag, it will also contain a hidden input field with the encrypted view state as its value.

The view state contains the following information:

  • All non-transient members of the page's controller (regardless of whether this is a standard or custom controller) and all controller extensions

  • The object graph for everything that is reachable from one of the non-transient members detailed in the previous bullet point

  • The component tree for the page

  • Internal housekeeping data for the Visualforce framework

The maximum size of the entire view state is 135 Kb. Typically, Visualforce developers don't worry too much about the size of the view state until this limit is exceeded. However, as the view state makes a round-trip to the server with every request, reducing the size has a direct impact on page...