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Choosing a career in Salesforce is just the optimum choice for every IT professional. The only thing is that you should be prepared for everything before the interview. The first step is to join the Salesforce certification training program then browse a list of VisualForce questions answers for Fresher and Experienced to crack the Salesforce interview successfully. As part of Salesforce, we will discuss top VisualForce interview questions in the blog that would help you in getting hired by top MNCs quickly.
VisualForce is a component-based framework for Force.com that includes tag-based markup language like HTML. Every VisualForce tag comprised of finely grained user components like page sections, controllers, or fields etc. As of now, VisualForce has around 100 built-in components and users have the flexibility to develop more based on business needs and requirements. \
The framework is based on the MVC paradigm where controllers can be generated automatically and integrated with the database. There is a special APEX programming language that helps you in writing your own controllers or extensions with the aid of AJAX components.
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VisualForce pages are rendered over the server displayed to a client browser. The framework is based on a traditional MVC paradigm where Model, View, and controller are defined in three separate layers. As shown in the diagram below, the Model will define either SObjects or APEX classes. ‘View’ will define pages and components. And controller comprises of Standard or Custom APEX Code.
A VisualForce controller defines a complete set of instructions that specify what can happen when the user interacts with different components available on VisualForce pages. These components may be buttons, links, or any other action item. There are three popular types of Visual Force Controllers in Salesforce. These are Standard Controller, Custom Controller, and the Controller Extensions.
With the standard controllers in Salesforce, you can interact with VisualForce pages with various inbuilt functionalities. The various types of standard actions in this special type of controller available are Save, Edit, Delete, and Cancel etc. The example of syntax is given below in the screenshot –
Syntax: <apex:page standardcontroller="account">
To display a complete list of records in the Salesforce VisualForce Page, standard list controllers are needed. It offers different pagination actions too like First, Last, Previous, or Next etc. They are almost similar to Standard Controllers except one more item is added to the Standard List controller i.e. recordSetVar. The example of syntax is given below in the screenshot –
Syntax: <apex:page standardcontroller="account" recordsetvar="accounts">
To implement custom logic with VisualForce Pages, customer controllers ate needed. There is a possibility to create new functionality with custom controllers. The example of syntax is given below in the screenshot –
Syntax: <apex:page controller="account">
Standard controllers offer the ability to access or communicate with data stored in the form of records and displayed properly in the user interface. The list of tasks performed by Standard Controllers includes – Good control on data, action control, and navigation control etc.
There are two popular ways to create a VisualForce Page in Salesforce – Method 1 - Go to the Setup Option on the top then click on Setup -> Develop -> Build -> Pages -> Create a new page. Now enter the name for the page and Save it. Method 2 – There is one VisualForce editor where you have to write /apex/page name at the URL and you are ready to create a fresh page in VisualForce.
This markup tag represents a single VisualForce page and every page should start and end with this tag only. For example –
For this purpose, you need to access the user details page and enable the ‘development mode’ option there to use the VisualForce Editor.
With the help of methods, we can bind in controllers inside VisualForce pages.
Controllers are used to defining data or actions for a VisualForce Page. They are also used to access different types of objects through APIs.
Yes, there certain cases when you need to go beyond controllers or custom APEX code. Take an example where you have to access data or actions beyond standard controllers, you need special APIs for this purpose.
There are some similarities and differences between the two controllers. Let us see how they resemble each other and in what aspect are they different? Both allow custom objects, custom data sets, and custom actions. They help in leveraging existing data and actions within a standard controller. What is the difference? The Custom controller should contain all data and actions within a page that will be executed later. At the same time, controller extensions allow data or auctioned that is extended in the form of buttons, links, custom overrides etc.
With the help of Properties, you may allow creating standard getters or setters automatically and still, they are available for customization. The major benefit of Properties is that you don’t have to write tedious code for hours and secondly you don’t have to read clutters while reviewing the code.
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These are Select Option, Standard Controller, Message, Page Reference etc.
They are able to manage multiple pages and state across each page that is not possible to manage by other simpler controllers in VisualForce. A VisualForce controller defines a complete set of instructions that specify what can happen when the user interacts with different components available on VisualForce pages. These components may be buttons, links, or any other action item. There are three popular types of Visual Force Controllers in Salesforce. These are Standard Controller, Custom Controller, and the Controller Extensions.
To prevent data to be saved in view state, the transient keyword is used in VisualForce. It should be utilized for temporary variables only.
If you wanted to implement any business logic like how to render a component and many more things than component controllers are needed for custom components.
We have discussed enough questions answers here that are frequently asked by the interviewers which can help in your selection by leading Companies worldwide. You can practice all these questions and answers confidently at the time of your final interview. We wish you luck for a successful life ahead with the Salesforce VisualForce Certification program at JanBaskTraining. Start your tech journey with world-class instructors now!
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