Advanced Visualforce Webinar
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The webinar on advanced Visualforce covered key topics such as managing view state, asynchronous Apex, and optimizing performance through methods like JavaScript remoting and the streaming API. It emphasized understanding view state, its implications, and strategies for reducing its size. The session included examples of code and practical applications related to these concepts, along with a Q&A segment.
![Option C: JavaScript Remoting: The Apex Class
public with sharing class FindCustomerController {
@RemoteAction
public static List<Contact> doSearch(String customerLastName) {
customerLastName = '%' + customerLastName + '%';
return [
SELECT id, FirstName, LastName
FROM Contact
WHERE LastName LIKE :customerLastName
LIMIT 200
]; JS Function
} Apex Method
JS Callback
}
Join the conversation: #forcewebinar](https://image.slidesharecdn.com/advancedvisualforcewebinar-121205165923-phpapp01/85/Advanced-Visualforce-Webinar-23-320.jpg)
![Option C: JavaScript Remoting: The Apex Class
public with sharing class FindCustomerController {
@RemoteAction
public static List<Contact> doSearch(String customerLastName) {
customerLastName = '%' + customerLastName + '%';
return [
SELECT id, FirstName, LastName
FROM Contact
WHERE LastName LIKE :customerLastName
LIMIT 200
]; JS Function
} Apex Method
JS Callback
}
Join the conversation: #forcewebinar](https://image.slidesharecdn.com/advancedvisualforcewebinar-121205165923-phpapp01/85/Advanced-Visualforce-Webinar-24-320.jpg)
![Option C: JavaScript Remoting: The Callback
function renderResults(results, event) {
var container = document.getElementById("results"),
html = [];
for (var i=0, j=results.length; i<j; i++) {
html.push("<tr><td>");
html.push(results[i].LastName + ", " + results[i].FirstName);
html.push("</td></tr>");
}
container.innerHTML = html.join(""); JS Function
} Apex Method
JS Callback
Join the conversation: #forcewebinar](https://image.slidesharecdn.com/advancedvisualforcewebinar-121205165923-phpapp01/85/Advanced-Visualforce-Webinar-25-320.jpg)
Advanced Visualforce Webinar
- 1. Force.com Webinar: Advanced Visualforce Eric Wilson Director, Product Management UI Platforms Join the conversation: #forcewebinar
- 2. Agenda 1. Assumptions 2. Your Frienemy: View State 3. Managing View State 4. Asynchronous Apex Join the conversation: #forcewebinar
- 3. Assumptions Join the conversation: #forcewebinar
- 4. This Advanced Webinar Assumes... ...you have used Visualforce and are comfortable with it. ...you have used Apex and are comfortable writing it. ...you understand HTML, JavaScript, and AJAX concepts. Join the conversation: #forcewebinar
- 5. Your Frienemy: View State Join the conversation: #forcewebinar
- 6. Q: What is View State? A: An encrypted, hidden <input> field on a Visualforce page that keeps track of Apex controller state & Visualforce page state between server requests. This field is only generated when there is an <apex:form> tag present on a page. Join the conversation: #forcewebinar
- 7. Visualforce Lifecycle A HTTP GET A. URL Requested E B. Apex Controller Instantiated on Server HTTP POST C. Controller State Serialized & Encrypted to View State D. Page Markup Sent to Browser & Rendered D B E. View State Decrypted & Deserialized (for Postbacks) <input type="hidden" value="..."/> C Join the conversation: #forcewebinar
- 8. View State: Your Frienemy Why it’s Great :-) Why it’s Not So Great :-( • Automatically keeps track of field • Can be bulky, affecting performance. values for you. • It has size limitations. • Allows for easy AJAX functionality. • Doesn’t allow for complex AJAX • Provides easy way to re-render page functionality. components. Join the conversation: #forcewebinar
- 9. View State is Required for... <apex:action*> <apex:command*> <apex:inlineEditSupport> <apex:input*> <apex:select*> Join the conversation: #forcewebinar
- 10. Managing View State Join the conversation: #forcewebinar
- 11. How Can I Manage My View State? A. Reduce Number of Components B. Use the transient Keyword C. Use JavaScript Remoting D. Use the Streaming API Join the conversation: #forcewebinar
- 12. Option A: Reduce Number of Components <apex:outputPanel layout="inline"...> <span...> <apex:outputPanel layout="block"...> <div...> <apex:panelGrid...> <table...> <apex:outputLink...> <a...> <apex:outputText styleClass="..."...> <span...> Join the conversation: #forcewebinar
- 13. Option B: Use the transient Keyword public with sharing class EditClientController { public Contact client { get; set; } transient public List<Contact> connections { get; set; } transient public List<Account> previousEmployers { get; set; } transient public Set<String> hashTags { get; set; } ... } Join the conversation: #forcewebinar
- 14. Option B: Use the transient Keyword BEFORE AFTER 58% Join the conversation: #forcewebinar
- 15. Option C: Use JavaScript Remoting Q: What is JavaScript Remoting? A: Stateless way to call Apex controller methods from JavaScript. Join the conversation: #forcewebinar
- 16. Option C: Use JavaScript Remoting Find Customer: <apex:actionFunction ... /> <apex:actionRegion ... /> JavaScript Remoting <apex:actionSupport ... /> Join the conversation: #forcewebinar
- 17. JavaScript Remoting Lifecycle JS Function Apex Method Client-side JS Callback Server-side Join the conversation: #forcewebinar
- 18. JS Function Apex Method JS Callback Join the conversation: #forcewebinar
- 19. Option C: JavaScript Remoting: The Page <apex:page controller="FindCustomerController"> <input id="searchField" type="text" placeholder="Enter Last Name"/> <button onclick="handleButtonClick();">Search</button> <table> <tbody id="results"></tbody> </table> JS Function </apex:page> Apex Method JS Callback Join the conversation: #forcewebinar
- 20. Option C: JavaScript Remoting: The Page <apex:page controller="FindCustomerController"> <input id="searchField" type="text" placeholder="Enter Last Name"/> <button onclick="handleButtonClick();">Search</button> <table> <tbody id="results"></tbody> </table> JS Function </apex:page> Apex Method JS Callback Join the conversation: #forcewebinar
- 21. Option C: JavaScript Remoting: The JavaScript function handleButtonClick() { var searchTerm = document.getElementById("searchField").value; FindCustomerController.doSearch(searchTerm, renderResults); } JS Function Apex Method JS Callback Join the conversation: #forcewebinar
- 22. Option C: JavaScript Remoting: The JavaScript function handleButtonClick() { var searchTerm = document.getElementById("searchField").value; FindCustomerController.doSearch(searchTerm, renderResults); } Apex Class Apex Method Apex Method Parameter JS Callback Function JS Function Apex Method JS Callback Join the conversation: #forcewebinar
- 23. Option C: JavaScript Remoting: The Apex Class public with sharing class FindCustomerController { @RemoteAction public static List<Contact> doSearch(String customerLastName) { customerLastName = '%' + customerLastName + '%'; return [ SELECT id, FirstName, LastName FROM Contact WHERE LastName LIKE :customerLastName LIMIT 200 ]; JS Function } Apex Method JS Callback } Join the conversation: #forcewebinar
- 24. Option C: JavaScript Remoting: The Apex Class public with sharing class FindCustomerController { @RemoteAction public static List<Contact> doSearch(String customerLastName) { customerLastName = '%' + customerLastName + '%'; return [ SELECT id, FirstName, LastName FROM Contact WHERE LastName LIKE :customerLastName LIMIT 200 ]; JS Function } Apex Method JS Callback } Join the conversation: #forcewebinar
- 25. Option C: JavaScript Remoting: The Callback function renderResults(results, event) { var container = document.getElementById("results"), html = []; for (var i=0, j=results.length; i<j; i++) { html.push("<tr><td>"); html.push(results[i].LastName + ", " + results[i].FirstName); html.push("</td></tr>"); } container.innerHTML = html.join(""); JS Function } Apex Method JS Callback Join the conversation: #forcewebinar
- 26. Option C: JavaScript Remoting: The Results JS Function Apex Method JS Callback Join the conversation: #forcewebinar
- 27. Option C: JavaScript Remoting: The Results BEFORE AFTER 234ms 152ms 35% Join the conversation: #forcewebinar
- 28. Option D: Use the Streaming API Q: What is the Streaming API? A: A highly performant way to get near-real-time updates from a Salesforce instance without polling. Join the conversation: #forcewebinar
- 29. Option D: Use the Streaming API BEFORE <apex:page controller="NewAccountsController"> <apex:form> <apex:actionPoller action="{!find}" rerender="wrapper" interval="15"/> <h1>Streaming API Example</h1> <h2>New Accounts</h2> <apex:outputPanel id="wrapper"></apex:outputPanel> </apex:form> </apex:page> Join the conversation: #forcewebinar
- 30. Option D: Use the Streaming API AFTER <apex:page controller="NewAccountsController"> <apex:includeScript value="..."/> <!-- 4 js files needed --> <h1>Streaming API Example</h1> <h2>New Accounts</h2> <div id="wrapper"></div> <script>... $.cometd.init(...) $.cometd.subscribe(...) ...</script> </apex:page> Join the conversation: #forcewebinar
- 31. Option D: Use the Streaming API: Steps Determine Your SOQL Query Create a PushTopic Record Include Necessary JavaScript Libraries on Visualforce Page Call cometd’s init(...) and subscribe(...) Functions (Inline JS) Watch Magic Happen Join the conversation: #forcewebinar
- 32. Asynchronous Apex Join the conversation: #forcewebinar
- 33. Asynchronous Apex public with sharing class SendInvoiceController{ @RemoteAction public static String requestAllInvoices(String customerId) { sendAllInvoices(customerId); return('All invoices have been requested.'); } @future private static void sendAllInvoices(String customerId) { EmailHelper.emailCustomerInvoices(customerId); } } Join the conversation: #forcewebinar
- 34. Survey Your feedback is crucial to the success of our webinar programs. Thank you! http://bit.ly/advancedvfsurvey Join the conversation: #forcewebinar
- 35. Q&A Eric Wilson Director, Product Management UI Platforms Join the conversation: #forcewebinar
- 36. Upcoming Events December 11, 2012 AppExchange for Developers Webinar http://bit.ly/XnFERP December 12, 2012 Apex CodeTalk Live Q&A http://bit.ly/apexct-vf Check out the Developer Force calendar for upcoming local events such as meetups, workshops, and user group meetings: http://developer.force.com/Calendar Join the conversation: #forcewebinar