Coding Apps in the Cloud with Force.com - Part 2

transcript

#forcewebinar

Coding Apps in the Cloud with Force.com – Part IIMarch 31st , 2016

#forcewebinar#forcewebinar

Speakers

Shashank SrivatsavayaSr. Developer Advocate Engineer@shashforce

Sonam RajuSr. Developer Advocate Engineer@sonamraju14

Forward Looking Statement

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.The risks and uncertainties referred to above include – but are not limited to – risks associated with developing and delivering new functionality for our service, new products and services, our new business model, our past operating losses, possible fluctuations in our operating results and rate of growth, interruptions or delays in our Web hosting, breach of our security measures, the outcome of any litigation, risks associated with completed and any possible mergers and acquisitions, the immature market in which we operate, our relatively limited operating history, our ability to expand, retain, and motivate our employees and manage our growth, new releases of our service and successful customer deployment, our limited history reselling non-salesforce.com products, and utilization and selling to larger enterprise customers. Further information on potential factors that could affect the financial results of salesforce.com, inc. is included in our annual report on Form 10-K for the most recent fiscal year and in our quarterly report on Form 10-Q for the most recent fiscal quarter. These 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 available and may not be delivered on time or at all. Customers who purchase our services should make the purchase decisions based upon features that are currently available. Salesforce.com, inc. assumes no obligation and does not intend to update these forward-looking statements.

Statement under the Private Securities Litigation Reform Act of 1995:

#forcewebinar

Go Social!@salesforcedevs / #forcewebinar

Salesforce Developers

This webinar is being recorded!The video will be posted toYouTube & the webinar recappage (same URL as registration).

#forcewebinar

Agenda• Part I – Demo• Visualforce Pages• Controllers• Javascript in Visualforce Pages• Part II - Demo• Q&A

#forcewebinar

Part I : Demo(Data Model, Application, Apex, SOQL, Triggers)

#forcewebinar

Visualforce

#forcewebinar

What's a Visualforce Page?

▪HTML page with tags executed at the server-side to generate dynamic content▪Similar to JSP and ASP▪Can leverage JavaScript and CSS libraries▪The View in MVC architecture

#forcewebinar

Model-View-Controller

ModelData + Rules

ControllerView-Modelinteractions

ViewUI code

▪Separation of concerns– No data access code in view– No view code in controller

▪Benefits– Minimize impact of changes– More reusable components

#forcewebinar

Model-View-Controller in SalesforceView

• Standard Pages• Visualforce Pages• External apps

Controller• Standard

Controllers• Controller

Extensions• Custom

Controllers

Model• Objects• Triggers (Apex)• Classes (Apex)

#forcewebinar

Component Library▪Presentation tags

– <apex:pageBlock title="My Account Contacts">▪Fine grained data tags

– <apex:outputField value="{!contact.firstname}">– <apex:inputField value="{!contact.firstname}">

▪Coarse grained data tags– <apex:detail>– <apex:pageBlockTable>

▪Action tags– <apex:commandButton action="{!save}" >

#forcewebinar

Expression Language

▪Anything inside of {! } is evaluated as an expression▪Same expression language as Formulas▪$ provides access to global variables (User,

RemoteAction, Resource, …)– {! $User.FirstName } {! $User.LastName }

#forcewebinar

Example 1• <apex:page>• <h1>Hello, {!$User.FirstName}</h1>• </apex:page>

#forcewebinar

Controllers

#forcewebinar

Standard Controller

▪A standard controller is available for all objects– You don't have to write it!

▪Provides standard CRUD operations– Create, Update, Delete, Field Access, etc.

▪Can be extended with more capabilities▪Uses id query string parameter in URL to access

object

#forcewebinar

Example 2• <apex:page standardController="Contact">• <apex:form>• <apex:inputField value="{!contact.firstname}"/>• <apex:inputField value="{!contact.lastname}"/>• <apex:commandButton action="{!save}" value="Save"/>• </apex:form>• </apex:page>

Function in standard controller

Standard controller

object

#forcewebinar

Email Templates

Embedded in Page Layouts

Generate PDFs

Custom Tabs

Mobile Interfaces

Page Overrides

Where can I use Visualforce?

#forcewebinar

What's a Custom Controller?• Custom class written in Apex• Doesn't work on a specific object• Provides custom data• Provides custom behaviors

#forcewebinar

Defining a Custom Controller

<apex:page controller="FlickrController">

#forcewebinar

Custom Controller Examplepublic with sharing class FlickrController { public FlickrList getPictures() { HttpRequest req = new HttpRequest(); req.setMethod('GET'); req.setEndpoint('http://api.flickr.com/services/feeds/'); HTTP http = new HTTP(); HTTPResponse res = http.send(req); return (FlickrList) JSON.deserialize(res.getBody(), FlickrList.class); }}

#forcewebinar

What's a Controller Extension?• Custom class written in Apex• Works on the same object as the standard controller• Can override standard controller behavior• Can add new capabilities

#forcewebinar

Defining a Controller Extension

<apex:page standardController="Speaker__c" extensions="SpeakerCtrlExt">

Provides basic CRUD

Overrides standard actions and/or provide additional capabilities

#forcewebinar

Defining a Controller Extension

<apex:page standardController="Speaker__c" extensions="CtrlExt1,CtrlExt2,CtrlExt3">

Provides basic CRUD

Can contain multiple extensions

#forcewebinar

Anatomy of a Controller Extensionpublic class SpeakerCtrlExt {

private final Speaker__c speaker; private ApexPages.StandardController stdController;

public SpeakerCtrlExt (ApexPages.StandardController ctrl) { this.stdController = ctrl; this.speaker = (Speaker__c)ctrl.getRecord(); } // method overrides // custom methods}

#forcewebinar

Javascript in Visualforce Pages

#forcewebinar

Why Use JavaScript?• Build Engaging User Experiences• Leverage JavaScript Libraries• Build Custom Applications

#forcewebinar

JavaScript in Visualforce Pages

Visualforce Page

JavaScript RemotingRemote Objects

(REST)

#forcewebinar

Examples

#forcewebinar

JavaScript Remoting - Server-Sideglobal with sharing class HotelRemoter {

@RemoteAction global static List<Hotel__c> findAll() { return [SELECT Id,

Name, Location__Latitude__s, Location__Longitude__s

FROM Hotel__c]; }

#forcewebinar

"global with sharing"?• global

• Available from outside of the application• with sharing

• Run code with current user permissions. (Apex code runs in system context by default -- with access to all objects and fields)

#forcewebinar

JavaScript Remoting - Visualforce Page

var lat = result[i].Location__Latitude__s; var lng = result[i].Location__Longitude__s; addMarker(lat, lng); } } else { alert(event.message); } });</script>

#forcewebinar

Using JavaScript and CSS Libraries

• Hosted elsewhere<script src="https://maps.googleapis.com/maps/api/js"></script>

• Hosted in Salesforce• Upload individual file or Zip file as Static Resource• Reference asset using special tags

#forcewebinar

Static Resources

#forcewebinar

Referencing Static Resources// Single file<apex:stylesheet value="{!$Resource.bootstrap}"/><apex:includeScript value="{!$Resource.jquery}"/><apex:image url="{!$Resource.logo}"/>

// ZIP file<apex:stylesheet value="{!URLFOR($Resource.assets, 'css/main.css')}"/><apex:image url="{!URLFOR($Resource.assets, 'img/logo.png')}"/><apex:includeScript value="{!URLFOR($Resource.assets, 'js/app.js')}"/>

#forcewebinar

Referencing Static Resources// Single file<link href="{!$Resource.bootstrap}" rel="stylesheet"/><img src="{!$Resource.logo}"/><script src="{!$Resource.jquery}"></script>

// ZIP file<link href="{!URLFOR($Resource.assets, 'css/main.css')}" rel="stylesheet"/><img src="{!URLFOR($Resource.assets, 'img/logo.png')}"/><script src="{!URLFOR($Resource.assets, 'js/app.js')}"></script>

#forcewebinar

Demo(Visualforce with Standard controller and Extension,

Custom Controller and Javascript)

developer.salesforce.com/trailhead

Recommended Trail:

Got Questions?

Post’em tohttp://developer.salesforce.com/forums/

Your feedback is crucial to the successof our webinar programs. Thank you!

http://bit.ly/forcewebinarfeedback

Thank You Try Trailhead: trailhead.salesforce.com

Join the conversation: #forcewebinar@salesforcedevs @SonamRaju14 @shashforce

Coding Apps in the Cloud with Force.com - Part 2

Technology