Can we use extension with custom controller?

Can we use extension with custom controller?

A controller extension is an Apex class that extends the functionality of a standard or custom controller. Use controller extensions when: You want to leverage the built-in functionality of a standard controller but override one or more actions, such as edit, view, save, or delete. You want to add new actions.

How do you initialize a Visualforce page in a test class?

Steps to setup test of Visualforce controller or extension:

1. Create test class.
2. Create PageReference to Visualforce page.
3. Pass PageReference variable to Test.setCurrentPage() to set current PageReference.
4. Instantiate the controller for the page.

What is Apexpages StandardController?

StandardController objects reference the pre-built Visualforce controllers provided by Salesforce. The only time it is necessary to refer to a StandardController object is when defining an extension for a standard controller. StandardController is the data type of the single argument in the extension class constructor.

What identifies a controller as being an extension?

A controller extension is any Apex class containing a constructor that takes a single argument of type ApexPages. StandardController or CustomControllerName , where ExtensionController is the name of a custom controller in this example. {!

What is the difference between a standard controller and custom controller?

The Custom Controller, is one that is used to inherit the Standard Controller’s functionality, whilst allowing to get access to extra information, like: Access data that is not available with a Standard Controller, like more than one level down child or related objects. Create custom behavior (properties or methods)

How should a developer verify that a specific account record is being tested in a test class?

How should a developer verify that a specific Account record is being tested in a test class for a visualforce controller? A. Insert the Account in the test class, instantiate the page reference in the test class, then use System.

Which is an example of a controller extension?

A controller extension is any Apex class containing a constructor that takes a single argument of type ApexPages.StandardController or CustomControllerName, where CustomControllerName is the name of a custom controller you want to extend. The following class is a simple example of a controller extension:

What happens when a controller extends a standard controller?

However, if a controller extension extends a standard controller, the logic from the standard controller does not execute in system mode. Instead, it executes in user mode, in which the permissions, field-level security, and sharing rules of the current user apply.

Where do I find controller extension methods in JavaScript?

The extension is associated with the page using the extensions attribute of the component. As with all controller methods, controller extension methods can be referenced with {! } notation in page markup. In the example above, the {!greeting} expression at the top of the page references the controller extension’s getGreeting method.

Why does apex controller run in system mode?

Like other Apex classes, controller extensions run in system mode. Consequently, the current user’s credentials are not used to execute controller logic, and the user’s permissions and field-level security do not apply.

We can use Stnadard controller/ Custom Controller and extensions at a time. But we cannot use Standard controller & Custom controller at a time. See below syntax to understand.

How do I extend a custom controller in Salesforce?

The extension controller is added to visualforce page using the extension attribute in component. Both standard controller and extension attributes must be used in component.

What are the ways that a controller extension can be specified on a Visualforce page?

The extension is associated with the page using the extensions attribute of the component. As with all controller methods, controller extension methods can be referenced with {! } notation in page markup.

What is the use of Apexpages StandardController?

A controller extension is an Apex class that extends the functionality of a standard or custom controller. Use controller extensions when: You want to leverage the built-in functionality of a standard controller but override one or more actions, such as edit, view, save, or delete.

What is the difference between a standard controller and a custom controller?

What is the difference between custom controller and controller extension?

Use custom controllers when you want your Visualforce page to run entirely in system mode, which does not enforce the permissions and field-level security of the current user. A controller extension is an Apex class that extends the functionality of a standard or custom controller.

When should you use controller extensions?

Use controller extensions when:

1. You want to leverage the built-in functionality of a standard controller but override one or more actions, such as edit, view, save, or delete.
2. You want to add new actions.
3. You want to build a Visualforce page that respects user permissions.

What is Extension class used for?

A controller extension is any Apex class containing a constructor that takes a single argument of type ApexPages. It provides additional functionality to a controller – either a standard controller or a custom controller. You can use multiple Apex classes separated by comma.

Can we use standard controller for custom object?

Visualforce pages that use this standard controller declaration can also be used as custom buttons on the object by linking them to this defined Visualforce page. Whereas the Standard Set Controller, accepts a list or a query locator of the native Standard Controller object type.

What is StandardController in Salesforce?

A StandardController object that is automatically provided for standard and all custom objects, bindable to a Visualforce page component with the “standardController” attribute. It provides a reference to a single/list of record to a set of common actions for data processing and default navigation.

When should you use a controller extension?

What is the definition of a controller extension?

A controller extension is any Apex class containing a constructor that takes a single argument of type ApexPages.StandardController or CustomControllerName, where CustomControllerName is the name of a custom controller you want to extend.

How to extend an ASP.NET MVC controller?

Recently, a question was asked on Stack Overflow regarding how to go about extending an existing ASP.NET MVC Controller that was present within another assembly or project (i.e. external to the “main” MVC application), so I thought I would take a bit of time to cover how one might handle this scenario. ProjectA Your main MVC application.

When to use inheritance to extend a controller?

If you actually want to extend the functionality of an existing controller, then inheritance might be the way to go. Inheriting from the controller within your main application will allow you to take advantage of any existing attributes, overridden methods, or underlying base controllers that might already place.

How to customize an application using an extension?

You can customize an application by using extensions. An extension enables you to add functionality to existing model elements and source code. Extensions provide the following capabilities: Creating new model elements.