Visualforce 38%

Question 1

What is a Visualforce Controller?

Answer 1

A set of instructions that specifies:

1. User interaction with VF markup, such as clicking a button or link.
2. Access to data that should be displayed in a page.
3. Modifications to component behavior.

Question 2

What is a standard controller?

Answer 2

A standard controller consist of the same functionality and logic that is used for a standard Salesforce page, I.E. standard Account controller.

Question 3

What happens if you use the standard controller on a page and the user doesn’t have access to the object?

Answer 3

The page will display a insufficient privileges error.

Question 4

What is a custom controller?

Answer 4

A class written in Apex that implements the logic for the page without using a standard controller.

Question 5

True/False: custom controllers execute in system mode.

Answer 5

True.
Are without sharing as standard and so ignores any permissions based on the users profile.
It is possible to change this by using the with sharing keyword in the controller extension.

Question 6

True/False: standard controller execute in system mode.

Answer 6

False. Standard controllers execute in user mode (with sharing).

Question 7

What is a controller extension?

Answer 7

A controller extension uses all the functionality in a standard controller. The controller extension expands or modifies that functionality by adding new capabilities or replacing standard capabilities.

Question 8

Why would you choose a controller extension over a custom controller?

Answer 8

With an extension you do not have to recreate everything that a standard controller does to tweak or extend its operation.

Question 9

What are custom components?

Answer 9

A reusable component that can be embedded in more than one Visualforce page.

Question 10

Why would you choose to create a custom component over page templates?

Answer 10

Components provide more power and flexibility because:
1. You can define attributes that can be passed in to each components, which can change the way the markup is displayed on the final page.
2. Components are displayed in the reference dialog alongside standard component descriptions.
Note, Templates are defined as pages.

Question 11

In which 4 ways can you integrate Visualforce pages into your Force.com application.

Answer 11

1. Custom tab
2. Override standard tab
3. Override standard buttons or links
4. Embedded in a detail page layout

Question 12

What are global variables?

Answer 12

Global variables can be used in Visualforce without a controller and are referenced by $. I.E. $User represents the current user record.

Question 13

How do you access fields from a record that are not globally available?

Answer 13

Associate the page with a controller.

Controllers provide pages with the data and business logic that make your application run.

Question 14

What are action methods?

Answer 14

Action methods perform logic or navigation when a page event occurs.

Question 15

How are action methods called from page markup?

Answer 15

By using the ! notation in the action parameter of one of the action tags: commandButton, actionPoller, etc.

Question 16

What does the action parameter in apex:actionFunction do?

Answer 16

defines a new JavaScript function that calls an action.

Question 17

What does the action parameter in apex:page do?

Answer 17

Calls an action when the page is loaded.

Question 18

What are getter methods?

Answer 18

Getter methods return values from a controller.

Note, Every value calculated by a controller must have a corresponding getter method.

Question 19

What are static resources?

Answer 19

Static resources allow you to upload content that can be referenced in a Visualforce page, incl. archives such as zip files.

Question 20

Why would you choose static resources over documents.

Answer 20

1. you can package related files
2. you can reference static resources by name in page markup by using the $Resource global variable instead of hardcoding document IDs.

Question 21

Order the following to get the lifecycle of a Visualforce page.

1. Metadata repository
2. Page request
3. Application server (page renderer)
4. HTML result
5. Application server
6. Compiled page definition

Answer 21

2. Page request
3. Application server
4. Metadata repository
5. Compiled page definition
6. Application server (page renderer)
7. HTML result

Question 22

How do you test Visualforce controllers?

Answer 22

When writing unit tests for controller extensions and custom controller classes, you can set query parameters that can then be used in the tests.

Question 23

What is the difference between the messaging options in VF?
1.
2.

Answer 23

1. apex:pageMessage is used to display a single custom message using the Salesforce formatting. You can specify the severity (which will control the display of the message box) and the strength (which will control the size of the box).
2. apex:pageMessages is used to display all of the messages on a page. It will display Salesforce generated messages as well as custom messages added to the ApexPages class.

Question 24

What is the difference between the messaging options in VF?
1.
2.

Answer 24

1. apex:message is used to display an error on only a very specific field. It is used to allow the developer to place field specific errors in a specific location.
2. apex:messages is similar to apex:message, but it displays all of the errors. These errors are displayed as a list with no styling.