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.
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.
What is the difference between LWC OSS and LWC on the platform?
LWC OSS and LWC on the platform have different release schedules. The LWC engineering team usually releases LWC OSS weekly, whereas the Salesforce platform is released three times a year. Because of this difference, the version of LWC on the Salesforce platform is 3–6 months behind the open-source version of LWC.
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?
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.
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 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.
Salesforce Basics
Salesforce is the world’s leader in customer relationship management (CRM) software and follows a cloud-only approach. Salesforce offers different Software-as-a-Service (SaaS) applications for marketing, sales, commerce, workplace, service, and more on top of the Lightning Platform (also known as Force.com ).
Salesforce Lightning Web Components (LWC) Basics
Lightning Web Components (LWC) is a framework that is using core Web & Web Components standards with some Salesforce/Lightning specifics on top of it.
Setup your Development Environment
Register on Salesforce Trailhead (it’s free!). You find some helpful explanations and courses to everything around the Salesforce galaxy — including LWC of course.
Test your Development Environment & Connect to Salesforce Org
Alright, enough of installations & configurations — let’s ensure our development environment is ready.
Next steps
We are prepared to dive deeper into the area of Salesforce LWC now. Follow along the next stories of this series to become a Salesforce LWC expert.
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:
Summary
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.
What is the difference between LWC and Salesforce?
The difference is how the engine is configured at the compiler level and at run time.
How often is LWC released?
The LWC engineering team usually releases LWC OSS weekly, whereas the Salesforce platform is released three times a year. Because of this difference, the version of LWC on the Salesforce platform is 3–6 months behind the open-source version of LWC. The open-source LWC engine is identical to the LWC engine on the Salesforce platform.
Is Lightning Web Components open source?
Lightning Web Components is open source, empowering you to explore the source code, customize the behavior for your needs, and build enterprise-ready web components on any platform, not just Salesforce.
Can you use Lightning web components on Heroku?
You used React, Angular, or Vue to build the customer-facing side of the application, and you deployed it on Heroku or on another platform. Today, you can use Lightning web components to build both sides of the application. The benefits are significant. You can now learn one framework instead of several.
Component Reference
The Component Reference is where you find the details about each Lightning component. It documents the full set of base components for both the Lightning Web Components and Aura programming models.
Locker Console and Locker API Viewer Tools
The Locker Console and Locker API Viewer help you develop secure JavaScript code that is compatible and runs efficiently with Lightning Locker.
Component Reference Examples
The component examples run in playgrounds. To experiment with an example, modify it and click Run. You can also play with the component examples at webcomponents.dev/org/lwc.
Known Issues and Limitations for the Component Reference
The Component Reference is a work in progress. Here are some known issues.
Promises in LWC (Lightning Web Components)
Hello folks! Today I would like to give you a short story of JavaScript Promise and show you how it is used in Salesforce Lightning Web Components. Let’s get started!
Promises in LWC
Promises in Lightning Web Components are usually used to invoke apex methods. “ The imported function returns a promise. ” ~ Salesforce
Aggregate Promises in LWC
Assume that you need to invoke the APEX method in the loop and you don’t have bulk apex method. The best approach for it will be to use Promise.all ()
Chain Promises in LWC
import getContactDetails from '@salesforce/apex/ContactController.getContactDetails';
