VISUALFORCE : HOW TO CALL APEX METHODS

Visualforce : Calling Apex Methods

In the previous Episode, we have discussed how to use getter and setter method in the apex controller and using that controller in a visualforce page.

In this Episode, we are going to discuss about how to call apex methods in a visualforce page.

When you create a visualforce page you create some fields and buttons right ??
So when you will call define and apex methods like {!xyz} in your visualforce page.

Let's understand the structure with simple example:

Controller Class :

=============================================

public class Demo

{

 public pageReference show()

 {

  return null; //When we give return null, it will come back to the same page.

  } 

}

=============================================

Now call show() method in visualforce page

=============================================

<apex:commandButton value="click" action="{!show}"/>

=============================================

When we click on the "click" button it will invoke pageReference show() method.

pageReference is the return type of array method that we have called from visualforce page.

So Whenever you want to redirect from one page to another page or want to change some values by calling methods from the apex controller class.

Now let's cook this recipe with a complete example :

Controller Class :

=============================================

public class Example

{

  public string name;

  public string getName()

  {

    return name;

  } 

 public void setName(string name)

 {

   this.name = name;

 }

 public pageReference show()

 {

 name = 'This is my name' + name;

 return null;

 }  

}

=============================================

In the above class, we have used a get and set method as well.

Now let's create a visualforce page and call {!name} method to retrieve the name from the apex controller class and {!show} method to call show() method from the apex controller class.

Visualforce Page :

=============================================

<apex:page controller="Example">

 <apex:form>

  <apex:outputlabel> 

     Enter Name 

  </apex:outputlabel>

   <apex:inputtext value ="{!name}"/>

    <apex:commandbutton value="click" 

                                            rerender="one" 

                                            action="{!show}"/>

    <apex:outputlabel id="one"> 

      {!name} 

    </apex:outputlabel>

  </apex:form>

</apex:page>

=============================================

Now lets click on preview 

=============================================

=============================================

Now enter your name in input box.

*Quick tip : To give lightning look and feel to your visualforce page you can add lightningStylesheets tag next to controller.

=============================================

<apex:page controller="Example" lightningStylesheets="true">

=============================================

Now hit on preview for to provide fresh lightning look.

=============================================

=============================================

Now enter your name and hit on click button.

=============================================

=============================================

Coool !! you have just created apex controller class and visualforce page to call apex methods.

WOHOOO !! YOU HAVE JUST COMPLETED VISUALFORCE: CALLING APEX METHODS EPISODE
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