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 is ApexPages?
The ApexPages namespace provides classes used in Visualforce controllers. The following are the classes in the ApexPages namespace. Action Class. You can use ApexPages. Action to create an action method that you can use in a Visualforce custom controller or controller extension.
What are the types of Apex severity message?
The severity of a Visualforce message. The summary Visualforce message. The detailed Visualforce message. The ID of the Visualforce component to associate with the message, for example, a form field with an error.
How do I show errors in Visualforce page?
addmessage Sometime we need to show error message on Visualforce page. We can implement this requirement by creating new instance of ApexPages. message and then adding message to Apexpages using ApexPages. addmessage.
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.
What is recordSetVar in Salesforce?
The recordSetVar attribute indicates that the page uses a list controller and the variable name of the record collection. This variable can be used to access data in the record collection.
What are extensions in Salesforce?
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.
How do I display a message in Apex class?
ApexPages. addMessage(new ApexPages. message(ApexPages.severity.INFO,cw.cat.name));
How do I display error in Apex trigger?
Another way to display an error message is by passing a custom label to the addError() method instead of a hardcoded string. This will help with handling translations in the future. First, we’ll create a custom label to store our error message. After creating the custom label that stores the error message.
What is view state error in Salesforce?
If the size of a particular page exceeds 135kb, the page will throw a view state error. A screenshot showing a view state error in salesforce. To check the view state of a visual force page you have to make sure that Show View State in Development Mode checkbox in the User Layout is checked.
How do I change the error message in Salesforce?
Create Custom Error Messages in the Login Discovery and Self-Registration Handlers
- From Setup, enter Apex in the Quick Find box, then click Apex Classes.
- From the list of Apex classes, find the class that implements Auth.
- Edit the Apex class to add the custom error message using the Auth.
What is the difference between rendered and Rerender?
Example: – You have 2 fields one is visible and second is hidden, you want the second field to be visible when the first field is filled then use render. reRerender: – Is used to refresh the particular output panel, block, and or fields after a server request has been completed.