7 habits of highly efficient visualforce pages
DESCRIPTION
TRANSCRIPT
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7 Habits of Highly Efficient
Visualforce Pages
How to Not Shoot Yourself in the Foot with Visualforce
Eric Wilson, salesforce.com
Director, Product Management - UI Platforms
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Safe Harbor
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This presentation may contain forward-looking statements that involve risks, uncertainties, and assumptions. If any such uncertainties
materialize or if any of the assumptions proves incorrect, the results of salesforce.com, inc. could differ materially from the results
expressed or implied by the forward-looking statements we make. All statements other than statements of historical fact could be
deemed forward-looking, including any projections of product or service availability, subscriber growth, earnings, revenues, or other
financial items and any statements regarding strategies or plans of management for future operations, statements of belief, any
statements concerning new, planned, or upgraded services or technology developments and customer contracts or use of our services.
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inc. is included in our annual report on Form 10-Q for the most recent fiscal quarter ended July 31, 2012. This documents and others
containing important disclosures are available on the SEC Filings section of the Investor Information section of our Web site.
Any unreleased services or features referenced in this or other presentations, press releases or public statements are not currently
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looking statements.
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Eric Wilson
Director, Product Management
UI Platforms
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About Me
Product Manager for All Salesforce UI Development Platforms
10+ Years @ Salesforce
Application Instructor
UI Developer
Interaction Designer
Product Manager
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Highly Efficient Visualforce Pages...
...Have Rock-Solid
HTML, CSS, &
JavaScript
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If You Don’t Know Basic Web Technologies...
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Pop Quiz!
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What’s Wrong With This HTML?
<table>
<tr>
<td class="header" colspan="2">...</td>
</tr>
<tr>
<td class="sidebar">...</td>
<td class="content">...</td>
</tr>
<tr>
<td class="footer" colspan="2">...</td>
</tr>
</table>
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What’s Wrong With This CSS?
.button {
background: #F8F8F8;
background: -webkit-linear-gradient(#F8F8F8, #D4DADC);
background: -moz-linear-gradient(#F8F8F8, #D4DADC);
background: -o-linear-gradient(#F8F8F8, #D4DADC);
background: -ms-linear-gradient(#F8F8F8, #D4DADC);
background: linear-gradient(#F8F8F8, #D4DADC);
filter: progid:DXImageTransform.Microsoft.gradient(...);
}
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What’s Wrong With This JavaScript?
function getTotalSum(itemArray) {
var sum = 0;
for (var item in itemArray) {
sum += item;
}
return sum;
}
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Highly Efficient Visualforce Pages...
...Do Not Support a
Single, Pixel-Perfect UI
on Every Browser
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Theory A: One UI to Rule Them All
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Theory A: One UI to Rule Them All
.button {
background: #F8F8F8 url("...") left top repeat-x;
background: -webkit-linear-gradient(#F8F8F8, #D4DADC);
background: -moz-linear-gradient(#F8F8F8, #D4DADC);
background: -o-linear-gradient(#F8F8F8, #D4DADC);
background: -ms-linear-gradient(#F8F8F8, #D4DADC);
background: linear-gradient(#F8F8F8, #D4DADC);
filter: progid:DXImageTransform.Microsoft.gradient(...);
}
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Theory A: One UI to Rule Them All
Q: Why Is This Bad?
A: Fragmentation (Code Maintenance), Performance
Browser-specific HTML
Browser-specific CSS
Browser-specific JavaScript
Unnecessary HTTP Requests (Makes Mobile Sad)
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Theory B: It’s OK To Be Different
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Theory B: It’s OK To Be Different
.button {
background: #F8F8F8 url("...") left top repeat-x;
background: -webkit-linear-gradient(#F8F8F8, #D4DADC);
background: -moz-linear-gradient(#F8F8F8, #D4DADC);
background: -o-linear-gradient(#F8F8F8, #D4DADC);
background: -ms-linear-gradient(#F8F8F8, #D4DADC);
background: linear-gradient(#F8F8F8, #D4DADC);
filter: progid:DXImageTransform.Microsoft.gradient(...);
}
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Theory B: It’s OK To Be Different
.button {
background: #F8F8F8 url("...") left top repeat-x;
background: -webkit-linear-gradient(#F8F8F8, #D4DADC);
background: -moz-linear-gradient(#F8F8F8, #D4DADC);
background: -o-linear-gradient(#F8F8F8, #D4DADC);
background: -ms-linear-gradient(#F8F8F8, #D4DADC);
background: linear-gradient(#F8F8F8, #D4DADC);
}
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Theory B: It’s OK To Be Different
.button {
background: #F8F8F8 url("...") left top repeat-x;
background: -webkit-linear-gradient(#F8F8F8, #D4DADC);
background: -moz-linear-gradient(#F8F8F8, #D4DADC);
background: -o-linear-gradient(#F8F8F8, #D4DADC);
background: -ms-linear-gradient(#F8F8F8, #D4DADC);
background: linear-gradient(#F8F8F8, #D4DADC);
}
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Theory B: It’s OK To Be Different
.button {
background: ;
background: -webkit-linear-gradient(#F8F8F8, #D4DADC);
background: -moz-linear-gradient(#F8F8F8, #D4DADC);
background: -o-linear-gradient(#F8F8F8, #D4DADC);
background: -ms-linear-gradient(#F8F8F8, #D4DADC);
background: linear-gradient(#F8F8F8, #D4DADC);
}
#F8F8F8
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Highly Efficient Visualforce Pages...
...Are Stateless,
Don’t Poll Our Servers,
and Defer Difficult Work
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Stateless / Non-Polling / Deferring Techniques
Use the transient Keyword (Reduces Viewstate)
Implement Visualforce Remoting (Reduces Viewstate)
Use the Streaming API (Removes Need for Polling)
Use @future Annotation (Executes Apex Asynchronously)
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transient Keyword: The Example
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transient Keyword: The Apex Class
public with sharing class EditClientController {
public Contact client { get; set; }
public List<Contact> connections { get; set; }
public List<Account> previousEmployers { get; set; }
public Set<String> hashTags { get; set; }
}
BEFORE
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transient Keyword: The Viewstate
BEFORE
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transient Keyword: The Apex Class
AFTER
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; }
}
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transient Keyword: The Viewstate
<input type="hidden" id="com.salesforce.visualforce.ViewState" name="com.salesforce.visualforce.ViewState"
value="fMiWLUoSiUjWyBHX9fDk1eLUrkW+FrZ1mLRQEcDZv4ocKNGwrFcWs+v0EzuEiisflTMEci830WiYmlUP9LB7VaxOURd20gbjZdaW+rTM9rhSEgwHsAv5csZFYy0ILY9urD0/9ekk26o5GJJ/7mJB8UVmTU4bAPCj27mq+y9WTO
PPeHAF6MXBUt16MTNlzoVlWTUEKuvFwhz/GZoApQoL8KmHqaP9kYWcSbsormJB8hNdWQpLh2ayKNfAcKyNk+xrDQVlQAMcAog12mixM97l2FOfcpKtTQF33zRVloMx2mYKst9tTps4VykwyQK7tXjhT9DKG8RvQ1jLk5vgQRGD/Is9nNw
z1v0zwpl9h+dEJOoHzxaIv7fwJKdjxjlJ35qsVhUaAdUSKDlbI8iW+l25aWlWTcWFKU1Sprdq5mix8MGjpDkwdhCEFdhGTUpcFkVTIfBDqbTJXQ1Xkx3cuqLqn52TMNFrTjgH2AASjo1DQONlbajQXW/KbCAKPqzx1lRqFIZrn4cpVGzV
Xk+CXzROAQwKwBPIenKeNNmZKy/8pTB79U7FWH5Jlm346EvCDS4M3F1B6Z73gfiWany5DqjAkNPRED6YFcTaGrV3Asguqth73d664RiWn7wldBMnl0CSdqL6PFnXvVq958kNZuVtTbNTCMwcfSzD3QvHsUJWVRuMYKRL3UlXBl0bid9VS
ViFGMlwTLIj0g3yjpPLvtbaDME1J6VgkXU/C8MGBPcFCkW9v6XummLawdx4jIiwha8jIzJXqZALXJlTap8M1fJGOmxQuO5e0Na4b5RCWJWET+rLdNI5iizosTAt29aJLWdi5LYCsw1iDnWQB4X4VsF2P0ZDwK50xX/x/PrVj9TiuPXrWW
Riolzb8gqbJXEV1a8i+AuU/SHhaK+eEdQH/CDy9hABrTaa2FijLx3GOGUP0LxItdZbQbSsIwAqE/U/mFYgEdqFkuo85Lyv6qAyCZFIN/vuNf3SbvuHDjjBGJni8zCwev8iU6LJM3cSy73mWK23HxydSraCpIYFZSbkrfSnlG1Ie7vNG9t
RTE+TKstXAPzVCL8egJfBSTLE2IvKHKvFiQoNpNZKPeQchse027RjxzCGVAN8zmrNx2kxdTY6waDStw2Etj0fJsXbE9Us1wnk+YSAQARdQv/5cdZ/TiCX5mZ4lct2sP2B+8KsfpCi7SOYeXMhfZnvNkgT4xrDL/8PCV7FKRa0mR6sYRQt
sFQXgbRQCGG3WGGMRrQNCpG+jM0BZvScsjXnBrlmyoqs4XIVyYRBo7ZAA9pJcIdxX79AzWgzFxL14G4n7uzl2lzjllOHe+qh7xLXNkFOQAiq5UIQhyWyU54VZjkwT2JatJteLfqU1ChtZDZ8jmmbRk7WejKlAW00MLN7ep2AGWJC0fek3
VSdtn+dJoTHDnsH3Lj6OtlS2zUVaQgvrL8S9YYF/m+lCpLTKKRKmt7jbOVjlmJ4gQvp7Uf0LLsh9gROLWpHCnwxy5oYoRhLVVNLUak6niRI8LGqGG0StT0HBnHQsy9nT+01Hnv7P4Bm41NBrV/MaVxxal/Q23Uq+00W8T4k/yox5+hxHX
RU7XF6rYx0/nNdIFvPWlU2He4JkPskiglpr3X9Gxdq9YgaANh7kgZRjdZAZW7lFlqT6io1HpscnUNv6hN8tv19HWLVwD+SsB1MKlsxgX0pbPDikQEQPo4CrT8kojE89PPQdbFJ8wbu2rHykJh3o5OhokQlgYc+ICVxp4mfrqFFOP7I6U+
g/z+mcrvDCTnTTzTwsxEIziwhwrWEYhM7P4cyOlqGtiZ1KaBGWe6Lmt4FEOPdmMB3poXg1zThQSbeZBSDYYYb5w/aSUZ+4OYeDPjReYOql3/dhUGB8+awOa+xXGIvCpprefZ9lsDpUYXMJasgUojt++7wCcYFSfRngvRKf/Jgy1uj3VEx
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zHAH+y5ZAnkFIrb+Lyds7dK0Mwl6SJKu7XZ+jo0M+mGWxY1cVaFahn6vfctSBakb62qrWwAjmBJ08cDVJn0H+n3LuSR1lwkhOhNti5xnpke6iXVs0KHhuU8uBHi6ch3lrJB4CFEPSSX2EXI6tBcGHZAsafvJQxhDaSL5VARk5GLI++ziP
rxd5E/UYOm9Vp5N6NX9REbXjwNCoyWvUInU/E8yBJbixXGJ4VqG8CpM8ZPoeCfJXl99a3A02nufVrvn9JarCpRfVNw4anZ3rd3jIOBxr3GCdKMelW/ujtM3v2T+v0WOloGS//lv8ReFZZmE+p6UQaQh+6RrqsJid/9Ovu8ADXhQdSdZJ1
COrP5wFus9GOYsdFBh2nDGIWs7ZirdXZ7+XFzGvWzAnaaoBDH6h59Sg3OUbSmf8Q+0SKPe4PPhnui3fQAAtlOISNhr+EALVSY+NRRFUytaLs716zLRXVFO4WHFh4c1p/45JUwYz1ALUKS4++QCNidbMzfkyhfSbcETmuz1Se4N2SDymzx
4+mwBuk/SqVrVJOqoLSyGWou0sHvfYfdusQA5akx03ka5xISMDM9xequmuF88mn9IGktWrZWbfUCc/xV/hjqrhFZIK1f1F83G86OjmWTTDWmP11OCrkKeLRhj6WDsRlv4MyepIi0tUiVWwUUtXPL/sKVL1FcGPjpEugiIs0wMtm9dhcq8
/EnhmCep/Gxs+gU1bz9rSjW+mCjMkPzPR11XewCisKewWskx6PzHPHSqM614w9l7O1m901kwG94aQ==">
AFTER
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transient Keyword: The Results
58%
BE
FO
RE
A
FT
ER
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Visualforce Remoting: The Example
Find Customer:
<apex:actionFunction ... />
<apex:actionRegion ... />
<apex:actionSupport ... /> Visualforce Remoting
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Visualforce Remoting: The Lifecycle
JS Function
Apex Method
JS Callback
Client-side
Server-side
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JS Function
Apex Method
JS Callback
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Visualforce Remoting: The Page
<apex:page controller="FindCustomerController">
<input id="searchField" type="text" placeholder="Enter Last Name"/>
<button onclick="findMeSomeCustomers();">Search</button>
<table>
<tbody id="results"></tbody>
</table>
</apex:page> JS Function
Apex Method
JS Callback
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Visualforce Remoting: The Page
<apex:page controller="FindCustomerController">
<input id="searchField" type="text" placeholder="Enter Last Name"/>
<button onclick="findMeSomeCustomers();">Search</button>
<table>
<tbody id="results"></tbody>
</table>
</apex:page> JS Function
Apex Method
JS Callback
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Visualforce Remoting: The JavaScript Controller
function findMeSomeCustomers() {
var searchTerm = document.getElementById("searchField").value;
FindCustomerController.doSearch(searchTerm, renderResults);
}
JS Function
Apex Method
JS Callback
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Visualforce Remoting: The JavaScript Controller
function findMeSomeCustomers() {
var searchTerm = document.getElementById("searchField").value;
FindCustomerController.doSearch(searchTerm, renderResults);
}
JS Callback Function Apex Method Parameter Apex Class Apex Method
JS Function
Apex Method
JS Callback
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Visualforce 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
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Visualforce 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
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Visualforce Remoting: The JavaScript 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
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Visualforce Remoting: The Results
JS Function
Apex Method
JS Callback
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Visualforce Remoting: The Results
234ms 152ms
35%
BEFORE AFTER
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Visualforce Remoting: The Difference
<apex:action*/> Visualforce Remoting
Uses Viewstate No Viewstate
Indirect Parameter Passing Direct Parameter Passing
Visualforce Handles Re-rendering You Handle Re-rendering
Less Flexibility More Flexibilty
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Streaming API: The Example
New Accounts Show Up Here...
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Streaming API: The Page
<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>
BEFORE
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Streaming API: The Page
<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>
AFTER
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Streaming API Demo
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Streaming API: Steps to Use
Define 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
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Streaming API: The Difference
<apex:actionPoller/> Streaming API
Uses Viewstate No Viewstate
Uses Polling Method Uses Pub/Sub Method
XHR Happens Always XHR Happens Only When It Has To
All Apex-Exposed SObjects Available Subset of Apex-Exposed SObjects
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Asynchronous @future: Why Does It Matter?
Perceived performance is more
important than actual performance.
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Asynchronous @future: The Apex Class
public with sharing class SendInvoiceController{
@RemoteAction
public static String requestAllInvoices(String customerId) {
sendAllInvoices(customerId);
return('All invoices have been requested.');
}
@future
public static void sendAllInvoices(String customerId) {
EmailHelper.emailCustomerInvoices(customerId);
}
}
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Asynchronous @future: The Difference
Synchronous Asynchronous
User Must Wait for Server Response Returns UI Control Immediately
Slower Perceived Performance Faster Perceived Performance
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Highly Efficient Visualforce Pages...
...Have Optimized
SOQL
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Optimized SOQL: The Basics
Place SOQL Queries Outside Loops
Use WHERE Clauses
Use Indexed Fields in WHERE Clauses
Use LIMIT
Use OFFSET
Use COUNT() (...or other aggregation functions, when possible)
Use FOR VIEW (...MRU API Pilot - adds items to MRU list) NEW!
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Optimized SOQL: Loops
public List<Invoice__c> getFamilyInvoices() {
List<Invoice__c> invoices = new List<Invoice__c>();
for (Contact c : this.contacts) {
invoices.addAll(
[SELECT id FROM Invoice__c WHERE Client__c = :c.id]
);
}
return invoices;
}
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Optimized SOQL: Loops
public List<Invoice__c> getFamilyInvoices() {
List<Invoice__c> invoices = new List<Invoice__c>();
List<Id> contactIds = new List<Id>();
for (Contact c : this.contacts) {
contactIds.add(c.id);
}
invoices.addAll(
[SELECT id FROM Invoice__c WHERE Client__c IN :contactIds]
);
return invoices;
}
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Optimized SOQL: WHERE Clauses
public List<Contact> getContacts() {
return [
SELECT id, lastName
FROM Contact
];
}
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Optimized SOQL: WHERE Clauses
public List<Contact> getContacts() {
return [
SELECT id, lastName
FROM Contact
WHERE CreatedDate > LAST_N_DAYS:365
];
}
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Highly Efficient Visualforce Pages...
...Use Standard
Set Controllers
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Standard Set Controllers
Optimized for Large Data Sets
Play Nicely With Salesforce List Views
Provide Robust Paging Capabilities
Should Be Used Liberally
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Highly Efficient Visualforce Pages...
...Aren’t Kitchen Sinks
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Don’t Do This...
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...Because Here Are Your Limits...
Viewstate: 135K
Total Page Size: 15MB (!!!)
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Bottom Line: Less is More
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Highly Efficient Visualforce Pages...
...Do Not Use
Any Salesforce
Resources
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Um, OK, But Why?
Sheer Size
No Developer Support
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Salesforce Resource Size
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How Do I Not Use Salesforce Resources?
<apex:page showHeader="false" standardStylesheets="false">
...
</apex:page>
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Developer Support
Salesforce Resources
Are Not Supported APIs
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Eric Wilson
Director, Product Management
UI Platforms
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