What is salesforce lwc


LWC is the Salesforce implementation of a new breed of lightweight frameworks built on web standards, which leverages custom elements, modules, shadow DOM, decorators, templates, and other new language constructs available in ECMAScript 7 and beyond.Jan 30, 2019

How to get started with LWC in Salesforce?

You can use ForceCode Extension for Salesforce as it supports LWC Or you can follow this trailhead module. Get easy to understand sample code for almost all use cases here. For more samples visit here. Develop a LWC yourself and try your code by running it here. Most importantly, Complete the Get Started with LWC trailmix.

Is Salesforce a W3C?

Salesforce is committed to developing open web standards and is a member of the World Wide Web Consortium (W3C). Base Lightning components are available as Aura components and as Lightning web components. The Component Reference includes documentation, specifications, and examples for both.

What is lightning Web Components (LWC)?

What Lightning Web Components (LWC)? LWC is a new programming model levering the recent web standards. Rather than being a totally custom and development wise rigid framework, It’s quite flexible.

What are the main contents of a LWC?

Similar to an AURA component, the main contents of a LWC are also html, javascript. There are optional content like css. But then in addition to these for LWC, an xml configuration file is also included which defines the metadata values for the component.


Why do we use LWC in Salesforce?

With the introduction of LWC, Salesforce is making it much easier for clients and partners to ramp up developers for their projects, enabling them to provide better service and paving a bigger path to achieving its own revenue goals.

What is the use of LWC?

It is basically used to create, update, read and delete a record without any using Apex Code. Similarly, LWC can also leverage LDS by accessing data and metadata from all Standard and Custom objects.

What is difference between aura and LWC?

cmp file, in LWC, you have a . html file. And whereas in Aura, you used custom Aura events, in LWC, you use standard DOM events. From an architect’s point of view, a developer with some experience working in JavaScript and web development will add value to an LWC project faster.

What is difference between LWC and lightning component?

Aura based lightning components are created using JS, HTML, but LWC is directly built on the web stack. The addition of above features gives more power to the web stack to build lightning UI components.

What are limitations of LWC?

You cannot use a LWC yet for Actions and LEX console is not yet supported. You can embed the LWC inside of an Aura component as a work-around. LWC does not offer two-way data binding, as Aura does. As a result, user input does not automatically propagate back to the controller.

Why is LWC preferred over aura?

Performance: Because of the absence of an abstraction layer, LWC is likely to load and run much faster than Aura components. It is also lightweight and memory-efficient as it is built on Web Components. Easy to ramp: As there is no additional framework, LWC developers can make transitions much easier.

What are the advantages of using LWC over Lightning components?

Main advantages of using LWC over Lightning Components, are:LWC is Fast.It automatically provides polyfill for older browsers which yet not support all underlying web standards (shadow dom, web components, etc.)Improved API support for third-party APIs.It is light weight.More items…•

What is the benefit of the lightning component framework?

There are many benefits of using the Lightning Component framework to build components and apps. Enable debug mode to make it easier to debug JavaScript code from Lightning components. Only enable debug mode for users who are actively debugging JavaScript. Salesforce is slower for users who have debug mode enabled.

How do you use LWC models?

< p >< b >Modals/Popup Box are used to display content in a layer above the app….Now we can add this lwc component on home page.Go to Home page.Click Setup (Gear Icon) and select Edit Page.Under Custom Components, find your modalPopupLWC component and drag it on right-hand side top.Click Save and activate.

How do I know where to use LWC?

On Google Chrome you can right-click and then left-click inspect. From here, click the Elements tab. Here we can see the lightning web component name in the HTML, this can be very useful when you are working on a page with preexisting code that you are unfamiliar with.

Lightning Web Components-Why, What & Where to start from?

AURA framework which was used for current Lightning Components was based on standards of 2014 but are outdated now and it was time for change because for the following reasons:

Lightning Web Components-Component Structure

Similar to an AURA component, the main contents of a LWC are also html, javascript. There are optional content like css. But then in addition to these for LWC, an xml configuration file is also included which defines the metadata values for the component.
So, a LWC component would look like:


This is the best time to learn and start early with Lightning Web Components, which offer the latest web standards, delivers unprecedented performance and productivity and interoperate seamlessly with existing code.

constructor ()

The constructor () method is invoked when a component instance is created.

connectedCallback ()

The connectedCallback () lifecycle hook is invoked when a component is inserted into the DOM.

disconnectedCallback ()

The disconnectedCallback () lifecycle hook is invoked when a component is removed from the DOM.

render ()

For complex tasks like conditionally rendering a template, use render () to override the standard rendering functionality. This function may be invoked before or after connectedCallback ().

renderedCallback ()

This lifecycle hook is specific to Lightning Web Components, it isn’t from the HTML custom elements specification.

errorCallback (error, stack)

This lifecycle hook is specific to Lightning Web Components, it isn’t from the HTML custom elements specification.

Wire Service Syntax

Import a wire adapter using named import syntax. Decorate a property or function with @wire and specify the wire adapter. Each wire adapter defines a data type.

Import References to Salesforce Objects and Fields

When you use a wire adapter in a lightning / ui * Api module, we strongly recommend importing references to objects and fields. Salesforce verifies that the objects and fields exist, prevents objects and fields from being deleted, and cascades any renamed objects and fields into your component’s source code.

Import References for Compound Fields

Name fields, address fields, and geolocation fields are compound fields. A compound field is accessible as a single, structured field, or as individual constituent fields. The value contained in the compound field and the values in the constituent fields both map to the same data stored in Salesforce.

Import Limitations

Salesforce supports many object or field suffixes to represent different types of data. Lightning Web Components supports the import of references to standard objects, as well as the import of references to custom objects ( __c) only. For example:

Mark a Configuration Object Property as Dynamic and Reactive

In the wire adapter’s configuration object, prefix a value with $ to reference a property of the component instance. The $ prefix tells the wire service to treat it as a property of the class and evaluate it as this.propertyName. The property is reactive. If the property’s value changes, new data is provisioned and the component rerenders.


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