Governor Limits · Lightning

Introduction to Lightning Web Component and Basic Applications for LWC

As I mentioned in my previous blog(Introduction to Lightning Aura Component), Salesforce supports 2 different programming modules.

  1. Lightning Aura Component (LAC)
  2. Lightning Web Component (LWC)

Since LWC is a big topic we will cover just introductory part in this blog. So the question is –

What is Lightning Web Component (LWC)?

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Lightning

SVG in Lightning Bundle

SVG stands for “Scalable Vector Graphics”. SVG defines vector-based graphics in XML format. Every element and every attribute in SVG files can be animated. SVG resource in lightning bundle can be used to define custom icons for your component. Here we are speaking about the icons and not logo. Icon and logo can look similar just like my blog’s icon and logo. But both are different. SVG deals with icons. By default if you see any component in salesforce, you can observe that default icon is undefined.

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Lightning

Design in Lightning Bundle

In design section you can control which attributes are exposed to builder tools like the Lightning App Builder, Experience Builder, or Flow Builder. A design resource lives in the same folder as yours .cmp resource, and describes the design-time behavior of the Aura component—information that visual tools need to display the component in a page or app.

<design:component label="Hello World">
    <design:attribute name="subject" label="Subject" description="Name of the person you want to greet" />
    <design:attribute name="greeting" label="Greeting" />
</design:component>
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Lightning

Renderer in Lightning Bundle

Renderer in Client-side is to override default rendering for a component. You can consider what data should render on load or on reload. 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. Otherwise, the framework will override your changes when the component is rerendered.

The base component in the framework is aura:component. Every component extends this base component.

This renderer has base implementations for the four phases of the rendering and rerendering cycles:

  • render()
  • rerender()
  • afterRender()
  • unrender()
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