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DEV-501 - Apex and Visualforce Controllers (DEV501) - Dump Information

Vendor : Salesforce
Exam Code : DEV-501
Exam Name : Apex and Visualforce Controllers (DEV501)
Questions and Answers : 239 Q & A
Updated On : December 7, 2018
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DEV-501 Questions and Answers

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DEV-501 Apex and Visualforce Controllers (DEV501)

Study Guide Prepared by Killexams.com Salesforce Dumps Experts


Killexams.com DEV-501 Dumps and Real Questions

100% Real Questions - Exam Pass Guarantee with High Marks - Just Memorize the Answers



DEV-501 exam Dumps Source : Apex and Visualforce Controllers (DEV501)

Test Code : DEV-501
Test Name : Apex and Visualforce Controllers (DEV501)
Vendor Name : Salesforce
Q&A : 239 Real Questions

satisfactory to concentrate that dumps today's DEV-501 exam are available.
I prepared the DEV-501 examination with the assist of killexams.Com Salesforce test education cloth. It changed into complicatedbut regular very helpful in passing my DEV-501 exam.


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The association time for DEV-501 examination become surely a nice experience for me. efficaciously passing, i have found outthe way to clean all the further tiers. because of killexams.com Questions & answers for all of the assistance. I had constrained time for readiness but killexams.com brain dumps became out to be a assist for me. It had vast question and solutions that made me plan in a quick compass.


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Salesforce Salesforce Apex and Visualforce

how to integrate Salesforce and CTI | killexams.com Real Questions and Pass4sure dumps

There are two elements of converting a potential prospect. One is to hold an acceptable track of the leads with correct evaluation and the 2nd is the normal yet most quintessential way of speakme with the lead over mobile. It has been realized over the time that no remember what approach you use, one-on-one telephonic dialog eventually cracks the deal for you.

Image title

Salesforce has turn into the undisputed king of the CRM world. It has set a bar for lead tracking and evaluation from a small to multi-billionaire agencies. So what different bonus can it offer you if you happen to can make calls and tune leads from the same device? This conception has been catching fire when you consider that its inception. the two feasible methods to accomplish it: Integration the usage of open CTI equipment. Integration the use of telephony carrier provider APIs.

procedure 1: Integration using open CTI tools

Open CTI or Salesforce CRM call middle is a device which is developed by using Salesforce.com. This device makes it possible for you to combine third-birthday party CTI systems. The entertaining part of the system is that you just shouldn't have to download CTI selected apps and get disadvantaged of the cloud structure, open CTI is browser-primarily based for that reason giving the developers full leverage to use the cloud architecture. To undertake this system we need a basic familiarity with JavaScript, HTML and CSS, Visualforce APIs, CTI adapters and Salesforce CRM call middle. One element used all over this procedure is Salesforce.com Open CTI API. one other is the  Asynchronous JavaScript Asterisk supervisor (AJAM) connector that has been custom constructed and deployed on the server. The last part is custom Salesforce Softphone.

each time a name is initiated through Salesforce, the AJAM connector it's current dials to the Asterisk part of the CTI service provider. The Asterisk part of the CTI service company, in turn, hyperlinks up a name to the conclusion user and then instructs AJAM to set up an reputable call and operate further projects like recording, transferring, monitoring and much more. The AJAM connector additionally helps in fetching the Caller IDs and linked records. The procedure is then mapped on to diverse servers and callers for each inbound and outbound tracking and calling.

Image title

process 2: Integration the usage of Telephony service provider API

When Salesforce changed into nevertheless within the construction phase, pushing notifications to the browser led to time lags and including call middle details multiplied lags to significant 10s of seconds. on account of such technological obstacles, previous laptop base telephony systems that had been used were related with the agent’s desktop making it a CTI-to-computing device model as an alternative of a CTI-to-Salesforce -to- Browser-model thereby minimizing the time lag. however with this speedy advancement of know-how in particular in cyber web and browser based mostly verbal exchange, CTI to laptop mannequin has now ceased to exist. Integration using the Telephony service issuer API uses here accessories to set up calls - customized Apex courses, the telephony provider issuer’s integration adapters, Salesforce.com CTI adapters and Visualforce courses.

each time a name is setup from the softphone of the Salesforce console the use of the phone service company’s adapter, the name will hit the phone supply server. Then the manage of the name is transferred to AGI adapter (Asterisk Gateway Interface) which is the JAVA gateway Interface adapter in most cases constructed the usage of Asterisk know-how. This adapter in-turn calls Salesforce.com’s CTI adapter and ensures  that a call has been dependent. Then the different particulars akin to name length, number, and so forth are displayed by Salesforce. it could additionally birth different services like call recording, and so forth.

Image title

youngsters, all through this total technique  information goes to Salesforce by the use of the phone service issuer’s adapter, which is computer primarily based. And a further vital issue being each time there is a new improve of Salesforce the adapter turns into incompatible. as a result of these issues, this components has now become obsolete nowadays.

On an ending note… a whichever system you decide upon there is coding need for every step. So it be premier to retain experienced people and the Salesforce specialists within the loop whenever you go for such integrations.

subject matters:

salesforce ,salesforce app construction ,salesforce app alternate ,salesforce customization ,salesforce construction ,salesforce integration ,salesforce.com ,crm purchasers ,cti salesforce integration


Salesforce to Launch "UI as a carrier"; presents Glimpse Into LinkedIn Platform | killexams.com Real Questions and Pass4sure dumps

Salesforce.com has introduced that they may be launching Visualforce, which it describes as “person-Interface-as-a-service,” as a part of the enterprise’s “summer time ‘08” release. I spoke with Ariel Kelman, senior director of platform product marketing at Salesforce earlier these days to get the skinny on this buzzword encumbered news, and while company software may additionally not be our MO here at Mashable, Visualforce is some thing to pay consideration to, because it’s potentially a expertise that can be emulated by using systems far and wide.

consumer Interface as a provider

“person Interface as a service” (UIaaS) is essentially what the title implies: versus constructing a UI from scratch, Visualforce allows for builders to make the most of pre-developed accessories to create their UI inside Salesforce functions. in case you're no longer established with Salesforce, their platform, AppExchange, is like the facebook Platform for business application, however with greater clients, and with some severe cash concerned.

For a simple example of UIaaS in motion, in case you wanted to consist of to your company’s implementation of Salesforce a Google Map displaying where your shoppers are located, that would be a pre-built component that could be added to your account via quite simply including a single tag. For a extra complex example, Kelman verified a very customized version of Salesforce the place Dolby (the sound enterprise) is the usage of Salesforce to music which sound platform a lot of theatres around the nation are using, with a graphical UI totally diverse from the commonplace Salesforce.com. in accordance with Salesforce, UIaaS accessories can include:

* Pages – this potential allows for the design definition of an application’s user interface.* add-ons – this gives the ability to create new applications that instantly in shape the seem to be and consider of Salesforce purposes or conveniently customise and extend the Salesforce consumer interface to selected customer and user requirements.* Apex Controllers - The controller enables consumers to construct any consumer interface habits.* Static elements - gives the capability to with ease create, reference, and manage the belongings used to create UIs—including photos, fashion sheets, JavaScript libraries, and different browser add-ons.* Inline page and Controller enhancing - In Visualforce building mode, valued clientele can edit Visualforce pages and Apex controllers directly from the runtime view of any page.

part Developer Ecosystem

in the meantime, there’s already a little of an ecosystem behind Visualforce; developers can build add-ons and either promote them to other users or offer them as open supply through Salesforce’s well-known AppExchange. up to now, Salesforce claims greater than four,000 builders and eleven,000 client interfaces within the preview software for Visualforce.

LinkedIn Platform Preview

The Visualforce demo also gave Kelman a chance to show me what Salesforce is up to with LinkedIn and its upcoming developer platform, which is at present best available to opt for companions. The implementation I noticed allows Salesforce clients to examine a selected consumer (for instance, FedEx) and see how many degrees away they're from them a definite contact inside that organization. hence, if I’m looking to get involved with a VP of enterprise development at FedEx, perhaps i can see that an Account supervisor I’m in contact with is just two degrees faraway from that key contact. That’s some fairly potent stuff in case you feel concerning the huge person move-over that likely exists between Salesforce and LinkedIn users - it well-nigh turns Salesforce into a CRM app coupled with a FoaF-style social community.

Salesforce Is atmosphere The commonplace For "severe" internet platforms

Is it just me, or do the announcements we hear from Salesforce appear to just make much more sense than a lot of the tie-u.s.we hear about on the purchaser side of the net? final month, the enterprise introduced a cope with Google to launch Salesforce for Google Apps, and from what I've viewed in my short tour of Visualforce, we're about to look loads of really helpful functions being cranked out through developers within the Salesforce neighborhood. It definitely adds extra credence to the thought that fb apps are only for enjoyable.


Checkmarx Raises Funding From Salesforce.com, Ofer hello-Tech | killexams.com Real Questions and Pass4sure dumps

Checkmarx, an Israeli issuer of static utility security checking out options, this morning introduced that it has raised an undisclosed volume of financing in a circular led by way of earlier backer Ofer hello-Tech, with participation from cloud computing company Salesforce.com.

The additional capital can be used to promote Checkmarx’s cloud-primarily based supply code scanning service CxCloud and ramp up sales and advertising and marketing efforts.

Checkmarx’ solutions in fact permit software builders to song, all the way through the purposes’ lifecycle, no matter if their code is following inner or exterior compliance necessities or is in response to the establishing and hosting platform guidelines.

nowadays, Checkmarx supports programming languages and frameworks comparable to C#, Java, C/C++, VB6 and Hypertext Preprocessor, as well as platform languages and frameworks reminiscent of Salesforce.com’s Apex and VisualForce.


DEV-501 Apex and Visualforce Controllers (DEV501)

Study Guide Prepared by Killexams.com Salesforce Dumps Experts


Killexams.com DEV-501 Dumps and Real Questions

100% Real Questions - Exam Pass Guarantee with High Marks - Just Memorize the Answers



DEV-501 exam Dumps Source : Apex and Visualforce Controllers (DEV501)

Test Code : DEV-501
Test Name : Apex and Visualforce Controllers (DEV501)
Vendor Name : Salesforce
Q&A : 239 Real Questions

satisfactory to concentrate that dumps today's DEV-501 exam are available.
I prepared the DEV-501 examination with the assist of killexams.Com Salesforce test education cloth. It changed into complicatedbut regular very helpful in passing my DEV-501 exam.


surprised to see DEV-501 actual take a look at questions!
The association time for DEV-501 examination become surely a nice experience for me. efficaciously passing, i have found outthe way to clean all the further tiers. because of killexams.com Questions & answers for all of the assistance. I had constrained time for readiness but killexams.com brain dumps became out to be a assist for me. It had vast question and solutions that made me plan in a quick compass.


Need something fast preparing for DEV-501.
This is the first-rate examination readiness ive ever long past over. I passed this DEV-501 partner exam hassle unfastened. No shove, no tension, and no unhappiness amid the examination. I knew all that I required to recognize from this killexams.Com Q&A %.. The inquiries are awesome, and i had been given notification from my associate that their coins decrease lower back surety lives up toexpectations.


it is exquisite to have DEV-501 real exam questions.
I surpassed the DEV-501 exam ultimate week and fully relied on this sell off from killexams.com for my coaching. that is a fantasticmanner to get certified as come what may the questions come from the actual pool of exam questions utilized by dealer. This way, almost all questions I were given at the exam seemed familiar, and i knew solutions to them. this is very dependable and honest, in particular given their money again guarantee (i have a chum who come what may failed an Architect degree exam and were given his money again, so that is for actual).


wherein am i able to locate DEV-501 latest and up to date dumps questions?
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Apex and Visualforce Controllers (DEV501)

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Deep Dive into Debugging Apex and Visualforce Code with New Force.Com Ide | killexams.com real questions and Pass4sure dumps

Introduction

This post is a short overview of how to debug Apex and Visualforce code in the JetForcer, a new modern Force.com IDE based on IntelliJ IDEA platform.

We’ll take a closer look at all available features and consider a few tricks that make debugging more easy and handy. For this, we'll construct a simple debugging puzzle and try to fix it.

Let's go!

Step 1: Prepare Org Data

Execute anonymous code and prepare org data

In brief, our aim is to create a Visualforce page that will display available accounts and provide an ability to filter them. First of all, fill our org with the necessary accounts. For this, run following code in the Execute Anonymous tool window or just use existing accounts.

Anonymous code:

Map<String, String> acctName2RatingMap = new Map<String, String>{ 'Ant Conglomerate' => 'Warm', 'Bee Collection Agency' => 'Cold', 'Beetle Brothers Body Shop' => 'Hot', 'Butterfly Beauty Supplies' => 'Cold', 'Flea LLC' => 'Cold', 'Fly Airlines' => 'Warm', 'Moth Candle Company' => 'Hot', 'Tick Timepieces' => 'Hot', 'Wasp Industrial Products' => 'Cold', 'Weevil Consultancy' => 'Warm' }; List<Account> newAccts = new List<Account>(); for(String accName : acctName2RatingMap.keySet()) { Account newAcct = new Account(); newAcct.Name = accName; newAcct.BillingCity = 'Suffragette City'; newAcct.Rating = acctName2RatingMap.get(accName); newAccts.add(newAcct); } for (Account each : newAccts) System.debug(each); insert newAccts; Step 2: Visualforce Controller

Next, let’s create a Visualforce controller to debug. It should be able to filter accounts list if needed or just return original data without filtration.  

Desired class content:

public class AccountViewerController { public Boolean removeCold {get; set;} public List<Account> results {get; set;} public AccountViewerController() { removeCold = false; results = [SELECT Id, Name, Owner.Name, Rating, BillingCity, BillingState FROM Account WHERE BillingCity = 'Suffragette City' ORDER BY Name ASC]; } public List<Account> getAccountTable() { List<Account> accountsToReturn = new List<Account>(results); if (Boolean.valueOf(removeCold)) { removeColdAccounts(accountsToReturn); } return accountsToReturn; } public void removeColdAccounts(List<Account> listToReduce) { System.debug('Removing "cold" accounts'); System.debug(' size before: ' + listToReduce.size()); for (Integer i = 0; i < listToReduce.size(); i++) { Account a = listToReduce.get(i); if (a.Rating.equalsIgnoreCase('Cold')) { listToReduce.remove(i); System.debug('removed cold account: ' + a.Name); } } System.debug(' size after: ' + listToReduce.size()); } public void noOp() { } } Step 3: Visualforce page

Now we need a Visualforce page to view and filter our accounts.Page markup:

<apex:page controller="AccountViewerController"> <apex:form > <apex:outputPanel id="resultTable"> <apex:pageBlock > <apex:actionstatus id="status"> <apex:facet name="start"> <div class="waitingSearchDiv" id="el_loading" style="background-color: #fbfbfb; height: 100%; opacity:0.65;width:100%;"> <div class="waitingHolder" style="top: 74.2px; width: 91px;"> <img class="waitingImage" src="/img/loading.gif" title="Please Wait..."/> <span class="waitingDescription">Please Wait...</span> </div> </div> </apex:facet> </apex:actionstatus> <apex:pageBlockSection title="Accounts Filter" collapsible="false"> <apex:inputCheckbox value="{!removeCold}" label="Hide Cold Accounts"> <apex:actionSupport event="onchange" action="{!noOp}" status="status" rerender="resultTable"/> </apex:inputCheckbox> </apex:pageBlockSection> <apex:pageBlockSection title="Scheduled Jobs" collapsible="false"> <apex:pageBlockTable value="{!accountTable}" var="a" id="thePageBlockTable"> <apex:column style="vertical-align:top"> <apex:outputField value="{!a.name}"/> <apex:facet name="header">Name</apex:facet> </apex:column> <apex:column > <apex:outputField value="{!a.BillingCity}"/> <apex:facet name="header">City</apex:facet> </apex:column> <apex:column > <apex:outputField value="{!a.BillingState}"/> <apex:facet name="header">State</apex:facet> </apex:column> <apex:column > <apex:outputField value="{!a.Rating}"/> <apex:facet name="header">Rating</apex:facet> </apex:column> </apex:pageBlockTable> </apex:pageBlockSection> </apex:pageBlock> </apex:outputPanel> </apex:form> </apex:page> Step 4: Configure Trace Flags

Next, configure trace flag for our Visualforce controller. It necessary for generation debug logs after controller activity. For trace flags management, JetForcer provides the Trace Flags tab in the Log Manager tool window.

Please note that there are few essentials for successful debugging:

  • Debug log should contain STATEMENT_EXECUTE events which used for navigating to sources. (Debug level for Apex log category should be at least "Finer")

  • [Optional] If you want to explore local variables, fields or constants with Variables View, then debug log should contain VARIABLE_ASSIGNMENT events (Debug level for Apex log category should be at least "Finest")

  • [Optional] If you want to debug Visualforce controllers, then debug log should contain VF_APEX_CALL_START events which used for calculating current source position. (Debug log for Visualforce log category should be at least "Fine")

  • Step 5: Identify a Problem

    Our expectations are that our Visualforce page should be working perfectly! Let’s make sure.

    As we can see, something went wrong and one “Cold” account is still persisted in the list. Why did this happen? It’s time for debugging!

    Step 6: Find Log with Log Manager

    After our activity in the browser, a corresponding debug log has been generated. Find it by using the Log tab from the Log Manager tool window.

    This tab is a powerful tool for managing debug logs and provides following features:

  • Retrieving new logs from the server by using the Retrieve Last Logs action;

  • Applying filters to logs table (e.g. filter all logs by specific Operation);

  • Distinguish between read/unread/new logs  (e.g. new logs are shown in bold);

  • Starting a new debug session or creating new debug configuration for selected log right from the Logs tab.

  • Step 7: Use Debug Watches for Exploring Significant Parts of Your Code.

    JetForcer provides Debug Watches to a handy exploring of code expressions values (variables, fields, method calls etc.) in the Variables View.

    Debug Watch is a System#debug(Object) method call with a specific pattern:

    System.debug('[<watch_name>::<watch_type>]:watches' + JSON.serialize(<expression>))

    We can avoid "List of size 10 too large to display" warning by using watches.

    Feel free to quickly add new watch by using "Add to Watches..." intention action.

    After adding watches you should deploy changes to the org and generate new debug logs according to new sources.

    Step 8: Stepping Through the Code Execution Flow (Step Actions and Breakpoints).

    JetForcer provides several methods of navigating through code while debugging:

    Step Actions: When a debug session is started, the Debug tool window becomes active and enables you to get control over the code flow execution by using Step Actions.

    They can be called from the Run menu in the main toolbar, or by using the actions on the stepping toolbar in the Debug tool window.

    Each stepping action advances the suspend context to the next STATEMENT_EXECUTE event location, depending on the action you choose.

  • Breakpoints are source code markers used to intentional suspending place in a code execution flow. Typically used for quickly jump to the desired STATEMENT_EXECUTE event by skipping all previous data. For adding or removing a breakpoint, click the left gutter area at a line where you want to toggle a breakpoint.

  • Step 8: Debug the Problem

    The problem is that removing "Cold" account from the list would change the positions of the subsequent accounts. It shifts them one position up.

    So if you have two consecutive "Cold" accounts, the second one would be always skipped by the filter.

    Step 9: Fix the Problem

    To fix the problem just decrement the value of the loop's counter "i", each time removing an account from the list.

    public void removeColdAccounts(List<Account> listToReduce) { System.debug('Removing "cold" accounts'); System.debug(' size before: ' + listToReduce.size()); for (Integer i = 0; i < listToReduce.size(); i++) { System.debug('[listToReduce-BEFORE::List<Account>]:watches' + JSON.serialize(listToReduce)); Account a = listToReduce.get(i); if (a.Rating.equalsIgnoreCase('Cold')) { listToReduce.remove(i); i--; // add fix System.debug('[listToReduce-AFTER::List<Account>]:watches' + JSON.serialize(listToReduce)); System.debug('removed cold account: ' + a.Name); } } ...

    That's About It!

    Here is a very concise overview of some JetForcer debugger capabilities, just to give you a quick start. If you find it interesting, you may try out a free 30-day trial version from the official website.Make sure you follow @JetForcer on Twitter to be notified about updates, features, new releases and interesting facts about the JetForcer plugin.

    Enjoy developing with JetForcer and JetBrains IDEs!

    Topics:

    salesforce development ,salesforce lightning ,salesforce crm ,salesforce course training ,salesforce app development ,salesforce customization


    Introducing the Force.com IDE | killexams.com real questions and Pass4sure dumps

    This chapter is from the book 

    The Force.com IDE is an extension to the standard Eclipse development tool for building, managing, and deploying projects on the Force.com platform. This section covers installation and gives a brief walk-through of the Force.com IDE components used throughout this book.

    Installation

    The Force.com IDE is distributed in two forms: a stand-alone application and a plug-in to the Eclipse IDE. If Force.com is your primary development language or you are not an existing Eclipse IDE user, the stand-alone version is a good choice. The plug-in version of the Force.com IDE requires Eclipse, which you can find at www.eclipse.org. Only specific versions of Eclipse are supported by the Force.com IDE. If you are already using Eclipse but it’s an unsupported version, keep your existing Eclipse version and install the supported version just for use with the Force.com IDE. Multiple versions of Eclipse can coexist peacefully on a single computer.

    Visit http://wiki.developerforce.com/index.php/Apex_Toolkit_for_Eclipse to learn how to install the stand-alone and plug-in versions of the Force.com IDE.

    Force.com Perspective

    A perspective is a concept used by Eclipse to describe a collection of user interface components. For example, Eclipse has built-in perspectives called Java and Java Debug. By installing the Force.com IDE, you’ve added a perspective called Force.com. Figure 4.1 shows the Force.com perspective, indicated in the upper-right corner.

    If you do not see the Force.com perspective, click the menu option Window, Open Perspective, Other; select Force.com from the Open Perspective dialog; and click the OK button. The Open Perspective dialog is shown in Figure 4.2.

    Figure 4.2

    Figure 4.2 Open Perspective dialog

    The Force.com perspective includes several user interface panels, called Views. You can see two of them at the bottom of Figure 4.1: Execute Anonymous and Apex Test Runner. It also adds a new type of project called the Force.com Project, which is shown in the left-side Navigator tab. The first step to using the Force.com IDE is to create a Force.com Project.

    Force.com Projects

    A Force.com Project allows you to read and write code, user interfaces, and other metadata objects within a Force.com organization from your local computer. Although this metadata is edited locally, it must be deployed to the Force.com service to run. Deployment to Force.com occurs automatically every time you make a modification to an object in a Force.com Project and save the changes. The contents of a Force.com Project are visible in the Navigator or Package Explorer Views.

    Problems View

    The Force.com IDE leverages the standard Eclipse View called Problems to display compilation errors. When you save changes to an object in a Force.com Project, it is sent over the network to the Force.com service for compilation. If compilation fails, Force.com-specific errors are added to the Problems View. In most cases, you can double-click a problem row to navigate to the offending line of code.

    Schema Explorer

    The Schema Explorer allows direct interaction with the Force.com database. Use it to inspect objects and fields and to execute database queries and preview their results. To open the Schema Explorer, double-click the object named salesforce.schema in any Force.com Project. In Figure 4.3, the Schema Explorer is open and displaying the fields in the Project object in its right panel. In its left panel, a query has been executed and has returned a list of Contact records.

    Apex Test Runner View

    All business logic written in Force.com must be accompanied by unit tests to deploy it to a production environment. Apex Test Runner View is a user interface to run unit tests and view test results, including statistics on code performance and test coverage. If the Apex Test Runner is not already visible on the bottom of your screen, go to the Window menu and select Show View, Apex Test Runner.

    Execute Anonymous View

    The Execute Anonymous View provides an interactive, immediate way to execute arbitrary blocks of Apex code. Unless noted otherwise, you can execute all the code snippets in this chapter directly from the Force.com IDE using the Execute Anonymous View.

    To try the Execute Anonymous View, first create a new Force.com Project. Go to the File menu and select File, New Force.com Project. Enter a project name; enter your Force.com username, password, and security token; and click the Next button. If you receive an error on this step, double-check your username, password, and security token. Also make sure you’re providing the credentials for a Developer Edition organization, given that other types of organizations might not have access to the Force.com API. Select the metadata components Apex and Visualforce; then click the Finish button to create the project.

    After you’ve created a project for your Development Edition organization, the Execute Anonymous View should be visible in the lower-right half of the screen. If not, go to the Window menu and select Show View, Execute Anonymous. In the Source to Execute text box, enter the code given in Listing 4.1. If the text box is not visible, resize your Execute Anonymous View until it’s tall enough to see it. If the text box is disabled, double-click the Execute Anonymous tab to maximize and enable it. After you’ve entered the code, click the Execute Anonymous button to run it.

    Listing 4.1 Hello World String helloWorld(String name) { return 'Hello, ' + name; } System.debug(helloWorld('Apex'));

    This sample code defines a function called helloWorld that accepts a single String parameter. It then invokes it with the name Apex and displays the results, Hello Apex, to the debug log.


    JavaScript for Visualforce Developers | killexams.com real questions and Pass4sure dumps

    But you can if you heed this advice! Introduction

    Since Lightning Components burst onto the scene, developers in the Salesforce ecosystem could be forgiven for assuming that Visualforce is now a legacy technology and that all new development should be carried out in Lightning. To my mind this is a little too black and white — while it’s likely that Lightning will get the lion’s share of attention from Salesforce, and Visualforce is likely to receive maintenance rather than new functionality, Visualforce is a mature technology that is in use in millions of applications around the world so it’s not going away any time soon.

    There’s also no reason to suppose that companies are going to drop their investment in Visualforce and rebuild all of their applications in Lightning — I always advise customers against this kind of thing unless there’s a compelling reason. Otherwise there’s a significant investment and the best possible outcome is that users don’t notice any difference, while the more likely outcome is that things don’t quite work as they did, or at all!

    Another reason I think the assumption is flawed is that it pre-supposes all Visualforce developers can seamlessly transition to Lightning with minimal effort. While this might be true for the likes of me that have been programming for nearly 40 years, it most definitely isn’t the case for those that have self-taught themselves Apex and Visualforce by building applications with the help and support of the Salesforce community. A lot of the time this is the only programming these people have done, so moving to another language isn’t straightforward — especially JavaScript! Loose typing, closures, functions as first class objects and prototypes are completely alien concepts when you are only used to a strongly typed statically compiled language like Apex.

    That said, I’d certainly advise Salesforce developers to start familiarising themselves with JavaScript, but this is much easier when done in the familiar surroundings of Visualforce, allowing the server to do most of the heavy lifting. Taking this approach isn’t a silver bullet though, so here’s some advice based on my own experience moving over.

    Take some time and learn JavaScript

    You don’t need to become an expert, but if you try to piece things together using snippets from other people’s code you’ll find this an exercise in frustration. JavaScript is very different to what you’ve been used to, and figuring out why the following code executes immediately and then throws ‘Uncaught ReferenceError: example is not defined’ could take a while.

    (function example(){alert('In example!');}()); example();

    There are masses of JavaScript resources on the web, and I’ve heard very good reports from people who’ve used Code School to get started. My preference is always books and I found Object Oriented JavaScript by Stoyan Stefanov was the one that made everything click for me. Your mileage will almost certainly vary, but it’s definitely worth spending the time to find the right learning method and then applying it.

    Separate JavaScript from HTML

    Unobtrusive JavaScript mandates separation of your JavaScript code from your presentation markup, which means no more attaching event handlers directly to HTML elements, such as:

    <input type="text" id="firstname" onchange="copyToLastname()" />

    If you do this, a developer that comes after you has to search through all of your markup as well as your JavaScript to figure out where a function might be used. Instead, attaching the handler to the element programmatically helps to clarify things, albeit at the cost of an extra line of code — your future colleagues will thank you for taking the time!

    document.getElementById('firstname').onchange = copyToLastName;

    (as an aside, this is an example of how functions are first class objects in JavaScript — I’ve defined copyToLastName elsewhere and I can simply assign it as the onchange function for the firstname element).

    Avoid Visualforce merge syntax in JavaScript

    It’s very tempting to do something like the following to plug a value from a Visualforce controller directly into your JavaScript:

    var firstname=’{!Contact.FirstName}’;

    which seems pretty innocuous. However, what this seemingly innocent line of code does is tightly couple your JavaScript to the Visualforce rendering engine — if the JavaScript isn’t processed by the rending engine, the merge syntax will be taken as a string literal and anywhere you use the firstname property will display {!Contact.FirstName} rather than the actual first name of the contact.

    Why is this a big deal I hear you ask? To minimise the load time of a page, you typically want to move the JavaScript into an static resource so that it can be included as an external file once development is complete. This allows the browser to cache the external file, meaning that the JavaScript doesn’t have to be delivered each time a user accesses the page. External files are included after the Visualforce page is delivered to the browser, which means they are only processed by the browser, not the Visualforce rendering engine.

    As a corollary to this, I always advise developing JavaScript in it’s own Visualforce component. This keeps it nicely separate from the page markup, while still delivering it as part of the page to make debugging easier. Once you are happy that everything is working as expected (yeah right!) it’s straightforward to migrate this to a static resource.

    Avoid anonymous functions

    I’ve said this in so many of my articles and presentations in the past, but it always bears repeating — use anonymous functions as sparingly as you can. For those new to JavaScript (and I’m expecting a few of you to be reading this), here’s an anonymous function:

    doRequest(function(response){console.log('Got response ' + response);});

    Which doesn’t look too bad on it’s own. Start adding more business logic and things quickly go bad:

    doRequest(function(response){console.log('Got response ' + response);if (response=='OK') {doSecondRequest(response, function(nextResponse){console.log('Got response ' + nextResponse);});}else {handleError(response, function(okStatus) {console.log('Handled error okay');}),function(errorStatus) {console.log('Unable to handle error');} );}});

    In the real world, with more business logic than simple console.log statements, when you get an exception in an anonymous function nested inside several other anonymous functions it’s pretty much impossible to figure out what actually happened. I know this because one of my early JavaScript ventures, Ticket to Ride,

    I ended up in exactly this situation. I’d pulled some data back from the server, handled the response in an anonymous function and then carried out a bunch of asynchronous function to store offline and then query back, handling all responses with additional anonymous functions. A week or so before my dry run I was frantically rewriting everything!

    Don’t pollute the global namespace

    If you declare variables in JavaScript like the following, these will all be added to the global namespace:

    var x=1;var y=2;var length=3;var count=7;

    The global namespace is the window object, so these declarations effectively are:

    window.x=1;window.y=2;window.length=3;window.count=7

    The global namespace, window, is shared between all JavaScript in your page. Thus if you have include another JavaScript file that declares:

    var count='This is the counter';

    Both declarations assign values to window.count and one JavaScript file is going to be disappointed when it acts on this and finds it’s suddenly become the wrong type.

    Instead, create objects specific to your JavaScript and enclose the variables inside these objects. You still stand a chance of colliding with an object from another JavaScript file, but a sensible naming convention should mitigate this:

    var bgAppObj={x : 1,y : 2,length : 3,count : 7};

    Using these is as simple as specifying the object name prior to the variable:

    console.log('Length = ' + bgAppObj.length);bgAppObj.count+=3;

    Thus even if another JavaScript file specifies a count variable in the global namespace, your variables are nicely isolated in a container and unaffected.

    That’s all there is to it?

    Believe that and you’ll believe anything. The JavaScript language is evolving — ES6 support is gradually being added to browsers, ES7 is finalised, frameworks rise faster than house prices and fall faster than politicians reputations, and JavaScript on the server via Node goes from strength to strength. Getting started with JavaScript means you are opening yourself up to a load more learning, but it’s the future and it’s best to get in as early as you can.

    I’m better known in the Salesforce community as Bob Buzzard — Umpteen Certifications, including Technical Architect, 5 x MVP and CTO of BrightGen, a Platinum Cloud Alliance Partner in the United Kingdom who are hiring.

    You can find my (usually) more technical thoughts at the Bob Buzzard Blog



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    FCTC [2 Certification Exam(s) ]
    Filemaker [9 Certification Exam(s) ]
    Financial [36 Certification Exam(s) ]
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    McData [3 Certification Exam(s) ]
    Medical [69 Certification Exam(s) ]
    Microsoft [368 Certification Exam(s) ]
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    NetworkAppliance [36 Certification Exam(s) ]
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    SASInstitute [15 Certification Exam(s) ]
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    SOA [15 Certification Exam(s) ]
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    Sybase [17 Certification Exam(s) ]
    Symantec [134 Certification Exam(s) ]
    Teacher-Certification [4 Certification Exam(s) ]
    The-Open-Group [8 Certification Exam(s) ]
    TIA [3 Certification Exam(s) ]
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    Trainers [3 Certification Exam(s) ]
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    TruSecure [1 Certification Exam(s) ]
    USMLE [1 Certification Exam(s) ]
    VCE [6 Certification Exam(s) ]
    Veeam [2 Certification Exam(s) ]
    Veritas [33 Certification Exam(s) ]
    Vmware [58 Certification Exam(s) ]
    Wonderlic [2 Certification Exam(s) ]
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    XML-Master [3 Certification Exam(s) ]
    Zend [6 Certification Exam(s) ]





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    Salesforce DEV-501 Exam (Apex and Visualforce Controllers (DEV501)) Detailed Information



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