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LWC Event Handle Tutorial-How To Handle Events in Lightning Web Components

Lightning Web Components - lightning web components: anatomy of an lwc. lightning web components best practices...

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LWC Event Handle Tutorial-How To Handle Events in Lightning Web Components

in this session alba rivas will show how to build a page step-by-step in lightning web components.

LWC Event Handle Tutorial-How To Handle Events in Lightning Web Components

3) when and when not to use apex with lightning web components.
learn the basic structure of lightning web components and how they leverage modern web standards.

LWC Event Handle Tutorial-How To Handle Events in Lightning Web Components
please join us live in our next session on "lightning web components" on jan.
00:16:17 - demo: single record with base lightning components.

LWC Event Handle Tutorial-How To Handle Events in Lightning Web Components

with all the advances in javascript and web standards in the last five years it's critical to understand certain concepts and constructs before you begin developing using the lightning web component (lwc) programming model.

LWC Event Handle Tutorial-How To Handle Events in Lightning Web Components

@api: Marks a field as public. Public properties define the API for a component. An owner component that uses the component in its HTML markup can access the component’s public properties. All public properties are reactive, which means that the framework observes the property for changes. When the property’s value changes, the framework reacts and rerenders the component.

LWC Event Handle Tutorial-How To Handle Events in Lightning Web Components

Tip Tip Field and property are almost interchangeable terms. A component author declares fields in a JavaScript class. An instance of the class has properties. To component consumers, fields are properties. In a Lightning web component, only fields that a component author decorates with @api are publicly available to consumers as object properties.
@track: Tells the framework to observe changes to the properties of an object or to the elements of an array. If a change occurs, the framework rerenders the component. All fields are reactive. If the value of a field changes and the field is used in a template-or in the getter of a property used in a template-the framework rerenders the component. You don’t need to decorate the field with @track. Use @track only if a field contains an object or an array and if you want the framework to observe changes to the properties of the object or to the elements of the array. If you want to change the value of the whole property, you don’t need to use @track.
Note Prior to Spring ’20, you had to use @track to mark fields (also known as private properties) as reactive. You’re no longer required to do that. Use @track only to tell the framework to observe changes to the properties of an object or to the elements of an array. Some legacy examples may still use @track where it isn’t needed, but that’s OK because using the decorator doesn’t change the functionality or break the code. For more information, see this release note.
@wire: Gives you an easy way to get and bind data from a Salesforce org.