#visualforce controllers

Custom Controller:

It is an Apex class that implements all of the logic for a page without leveraging a standard controller.

Custom Controllers are associated with Visualforce pages through the controller attribute.

Custom controller defines its own functionality.

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.

You’d use this when your page isn’t dealing with a main object.

Create & Use Custom Controllers

Prologue to Custom Controllers:

Custom controllers contain custom rationale and information control that can be utilized by a Visualforce page. How Visualforce bolsters the Model– View– Controller (MVC) plan design for building web applications. Controllers regularly recover the information to be shown in a Visualforce page, and contain code that executes in light of page activities, for example, a catch being clicked. When you utilize the standard controller, a lot of, well, standard usefulness is given to you by the stage.

Make a Visualforce Page that Uses a Custom Controller:

By or take a reference the name of the controller class

<apex:page> controller Attribute

At the point when your page utilizes a custom controller, you can't utilize a standard controller.

• Open the Developer Console and snap File | New | Visualforce Page to make another Visualforce page. Enter Contacts List Controller for the page name.

• In the editorial manager, supplant any markup with the accompanying.

<apex:page controller="ContactsListController">

   <apex:form>

       <apex:pageBlock title="Contacts List" id="contacts_list">            

           <!-- Contacts List goes here -->

       </apex:pageBlock>

   </apex:form>

</apex:page>

When you try to save this page, you’ll get an error, because Contacts List Controller doesn’t exist yet.

 A Visualforce controller is a set of instructions that specify what happens when a user interacts with the components specified in associated Visualforce markup, such as when a user clicks a button or link.          There are three types of controllers available in visualforce. Those are:      Standard Controllers      Controllers      Extensions          Standard Controllers:      A Visualforce controller is an arrangement of directions that indicate what happens when a client cooperates with the parts determined in related Visualforce markup, for example, when a client clicks a catch or connection. Controllers likewise give access to the information that thought to be shown in a page, and can alter segment conduct.

Create & Use Custom Controllers

Extra data about utilizing standard controllers:

Standard Controllers:

A Visualforce controller is an arrangement of directions that indicate what happens when a client cooperates with the parts determined in related Visualforce markup, for example, when a client clicks a catch or connection. Controllers likewise give access to the information that thought to be shown in a page, and can alter segment conduct.

Extra data about utilizing standard controllers:

·         Partner a Standard Controller with a Visualforce Page

·         Getting to Data with a Standard Controller

·         Utilizing Standard Controller Actions

·         Approval Rules and Standard Controllers

·         Styling Pages that Use Standard Controllers

·         Checking for Object Accessibility

·         Custom Controllers and Controller Extensions

Create & Use Custom Controllers

Prologue to Custom Controllers:

Custom controllers contain custom rationale and information control that can be utilized by a Visualforce page. How Visualforce bolsters the Model– View– Controller (MVC) plan design for building web applications. Controllers regularly recover the information to be shown in a Visualforce page, and contain code that executes in light of page activities, for example, a catch being clicked. When you utilize the standard controller, a lot of, well, standard usefulness is given to you by the stage.

Make a Visualforce Page that Uses a Custom Controller:

           By or take a reference the name of the controller class

<apex:page>                     controller              Attribute

At the point when your page utilizes a custom controller, you can't utilize a standard controller.

• Open the Developer Console and snap File | New | Visualforce Page to make another Visualforce page. Enter Contacts List Controller for the page name.

• In the editorial manager, supplant any markup with the accompanying.

<apex:page controller="ContactsListController">

   <apex:form>

       <apex:pageBlock title="Contacts List" id="contacts_list">

                       <!-- Contacts List goes here -->

       </apex:pageBlock>

   </apex:form>