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What is the difference between rendered and rerender in Salesforce?
1. Rendered : It use to place condition for a component (Field, outptpanel, section etc), that will show or not on page. 2. ReRender : It is use after a ajax call, Is comonent will again check condition for that component. 3. RederAs : It is use for Visualforce page show as PDF file or other
What is the meaning of rendered and rerendered attribute?
could please anyone what is exactly meaning rendered and rerendered attribute , where this attribute useful . When “rendered” is true, the element will be displayed on the screen. When “rendered” is false, the element will not be displayed on the screen or be placed into the output buffer.
When to use the’rerender’attribute in Visualforce?
This is useful when you want to display an element only during certain situations, such as displaying an error message, or rendering certain columns in a table depending on if any values are present. The “rerender” attribute specifies a list of elements that should be dynamically updated using Visualforce’s AJAX library.
What is rendering service in ReactJS?
The framework’s rendering service takes in-memory component state and creates and manages the DOM elements owned by the component. If you want to modify DOM elements created by the framework for a component, you can modify the DOM elements in the component’s renderer.
What is rendering in Salesforce lightning?
Each Lightning event triggers one or more actions that can update data. The updated data can fire more events. The rendering service tracks the stack of events that are fired. The framework rerenders all the components that own modified data by calling each component’s rerender() method.
What is render in aura?
When a component is rendered or rerendered, the aura:valueRender event, also known as the render event, is fired. Handle this event to perform post-processing on the DOM or react to component rendering or rerendering. The event is preferred and easier to use than the alternative of creating a custom renderer.
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 ReRender in HTML?
Rerender – Particular block will be refreshed. It means to refresh a part of a page on the basis of an event. For e.g when you click on a button or link you want some pageblocktable in your page to be refreshed so by rerendering we can refresh that table only instead of whole page.
What is DOM in Salesforce?
The DOM (DOM (Document Object Model) is just a model of the document. It could be a HTML/XHTML documents or XML document. The DOM only describes a structure of objects and it representation and accessibility.
What is Aura method in Salesforce?
aura method in lightning salesforce. Use aura:method to define a method as part of a component’s API. This enables you to directly call a method in a component’s client-side controller instead of firing and handling a component event.
What is Apex for Salesforce?
Apex enables developers to access the Salesforce platform back-end database and client-server interfaces to create third-party SaaS applications. Apex includes an application programming interface (API) that Salesforce developers can use to access user data on the platform.
What are controllers in Salesforce?
Controllers are those who provide business logic to Visualforce pages. It accepts data from user like input values. Controller manipulates user’s input and performs action on behalf of the User. Manipulated User’s data is redirected to browser as a new page.
How many types of controllers are there in Salesforce?
There are basically two types of Controller in Visualforce page.
What is the difference between render 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.
What is rendering in VF page?
A Visualforce component in a VF page can be displayed or hidden by using a rendered attribute. Rendered is bound to a Boolean variable in the controller which can be switched between true and false making the VF component display or hide depending on a Boolean value.
When React render is called?
First of all, render() is not user callable. It is part of the React component lifecycle. Generally, it gets called by React at various app stages when the React component instantiates for the first time, or when there is a new update to the component state. Render does not take any arguments and returns a JSX.
Base Component Rendering
The base component in the framework is aura:component. Every component extends this base component.
Rendering Lifecycle
The rendering lifecycle happens once in the lifetime of a component unless the component gets explicitly unrendered. When you create a component:
Rerendering Lifecycle
The rerendering lifecycle automatically handles rerendering of components whenever the underlying data changes. Here is a typical sequence.
Custom Renderer
You don’t normally have to write a custom renderer, but it’s useful when you want to interact with the DOM tree after the framework’s rendering service has inserted DOM elements. If you want to customize rendering behavior and you can’t do it in markup or by using the init event, you can create a client-side renderer.
Customize Component Rendering
Customize rendering by creating a render () function in your component’s renderer to override the base render () function, which updates the DOM.
Rerender Components
When an event is fired, it may trigger actions to change data and call rerender () on affected components. The rerender () function enables components to update themselves based on updates to other components since they were last rendered. This function doesn’t return a value.
Access the DOM After Rendering
The afterRender () function enables you to interact with the DOM tree after the framework’s rendering service has inserted DOM elements. It’s not necessarily the final call in the rendering lifecycle; it’s simply called after render () and it doesn’t return a value.
chanchal kumar
This to rendered (ie., display) particular filed or section based on boolean value. In the controller you need to have get method to assign the value for this variable.
Anjali
Render in lightning :To override the base render ()function after component initialization,You need to call superRender ()function.It returns value (DOM or NULL).Anything needs to be changed during default rendering.
shariq
Create a Custom Renderer
The framework’s rendering service takes in-memory component state and creates and manages the DOM elements owned by the component. If you want to modify DOM elements created by the framework for a component, you can modify the DOM elements in the component’s renderer.
Parul
rerender ():
It allows the component to update themselves, when other component updates since they were last rendered. It doesn’t return any value. It automatically called when data is updated in the component. Call superRerender () to chain rerendering to the components in body attribute.
Example:
