Regarding Visual Force Page standard Controller tags

Question

Visual force Page standard Controller code:

<apex:page standardController="Account">
<apex:commandButton action="{!Cancel}" value="Back"/>
<apex:commandButton action="{!Save}" value="Save" />

The above code is Standard Controller Code, which contains standard commandbutton action such as cancel and save

custom object:

<apex:page standardController="Visit__c">
<apex:commandButton action="{!Cancel}" value="Back"/>
<apex:commandButton action="{!SaveNavigate}" value="Save">

The above code contains save and Navigate Option,how they are adding functionality of action called {!SaveNavigate} Manually in custom object.

Answer 1

Every StandardController has the same available methods, and SaveNavigate is not one of them. In order to define such a method, you would need to Build a Controller Extension. Without specifying the extensions attribute on your <apex:page>, your included examples should fail to compile.

Markup

<apex:page standardController="MyObject__c" extensions="MyExtension">
    <apex:form>
        <apex:commandButton value="Custom" action="{!saveNavigate}" />
    </apex:form>
</apex:page>

Code

public with sharing class MyExtension
{
    public MyExtension(ApexPages.StandardController controller)
    {
        // any necessary constructor logic
    }
    public PageReference saveNavigate()
    {
        // do stuff
    }
}