What is the use of actionSupport?
actionSupport component adds AJAX support to other components in visualforce. It allows components to be refreshed asynchronously by calling the controller’s method when any event occurs (like click on button). It allows us to do partial page refresh asynchronously without refreshing full page.
What is Apex commandButton?
apex:commandButton, this is used to define a button that is rendered as an HTML input element with the type attribute set to submit, reset, or image, depending upon the commandButton tag’s specified value.
What is the difference between actionFunction and actionSupport?
Action function can call the controller method from java script. 2. Action support adds AJAX support to another visualforce component and then call the controller method. Here action support adds AJAX to output panel, so once you click on output panel controller method will be called.
What is Apex Param?
tag is used to pass values from JavaScript to an Apex controller,it can only be used with the folloing parent tags.
How do I use commandLink in Visualforce page?
apex:commandLink
- A link that executes an action defined by a controller, and then either refreshes the current page, or navigates to a different page based on the PageReference variable that is returned by the action.
- To add request parameters to an , use nested components.
What is the use of ActionSupport in struts2?
ActionSupport class is the default implementation of Action interface and it also implements interfaces related to Validation and i18n support. ActionSupport class implements Action, Validateable, ValidationAware, TextProvider and LocaleProvider interfaces.
What is ActionSupport in struts2?
Struts 2 Action Classes Class ActionSupport provides default implementations for the most common actions (e.g. execute, input) and also implements several useful Struts 2 interfaces. When your Action class extends class ActionSupport your class can either override the default implementations or inherit them.
What is Actionstatus in Salesforce?
A component that displays the status of an AJAX update request. An AJAX request can either be in progress or complete. Use this component to get user input for a controller method that does not correspond to a field on an sObject.
What is AJAX in Salesforce?
AJAX is the art of exchanging data between server and client without reloading the complete web page. Visualforce has inbuilt support for the AJAX. using the attribute “rerender” we can specify that where the response should be rendered.
What is Apex component?
The Apex component allows us to use custom components with attributes that can be passed to a Visualforce page by using tag. The attribute names can be used as a reference in VF pages, and the type attribute can be of list, primitives, sObjects, maps, and custom Apex classes.
Can I pass parameters from VF page to Apex method?
The answer to this question is, yes, we can pass values from VF page to APEX controller.
What is Apex commandLink?
A link that executes an action defined by a controller, and then either refreshes the current page, or navigates to a different page based on the PageReference variable that is returned by the action. An component must always be a child of an component.
What is Apex form?
A section of a Visualforce page that allows users to enter input and then submit it with an or . The body of the form determines the data that is displayed and the way it’s processed. It’s a best practice to use only one tag in a page or custom component.
What is pojo in Struts2?
In struts 2, action class is POJO (Plain Old Java Object). POJO means you are not forced to implement any interface or extend any class. Generally, execute method should be specified that represents the business logic.
What is ActionContext in Struts 2?
The ActionContext is the context in which an Action is executed. Each context is basically a container of objects an action needs for execution like the session, parameters, locale, etc. The ActionContext is thread local which means that values stored in the ActionContext are unique per thread.
What is Apex action function?
A component that provides support for invoking controller action methods directly from JavaScript code using an AJAX request.
What is action function in Visualforce page?
ActionFunction is used to execute a method in your Apex Class from your Visualforce Page asynchronously via AJAX requests. Its easy to call a controller method using attribute action=”{! YourMethodeName}” . An component must be a child of an component.
What is the difference between rendered and ReRender?
Rendered-This attribute is used to display a particular filed or section based on boolean value. ReRender- This is to reload some fields, or sections after some operation. Advantage of it is that the whole page is not refreshed and only a portion(the one which is ReRendered) is refreshed.