In Chapter 3, we deep-dived into composing a component with lifecycle hooks, computed properties, watchers, methods, and other features. We also learned about the power of slots and how to receive external data from other components using props.
Based on that foundation, this chapter guides you on how to build the interactions between components using custom events and provide/inject patterns. It also introduces Teleport API, which allows you to move elements around the DOM tree while keeping their order of appearance inside a Vue component.
Nested Components and Data Flow in Vue
Vue components can nest other Vue components inside them. This feature is handy in allowing users to organize their code into smaller, manageable, and reusable pieces in a complex UI project. We call nested elements child components and the component containing them their parent component.
Data flow in a Vue application is unidirectional by default, which means that the parent component can pass data to its child component but not the other way around. The parent can pass data to the child component using props (discussed briefly in “Exploring the Options API”), and the child component can emit events back to the parent component using custom events emits. Figure 4-1 demonstrates the data flow between components.
Figure 4-1. One-way data flow in Vue components ...
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