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Component Composition in LWC – Parent-Child Communication

Component Composition in LWC – Parent-Child Communication
Component Composition in LWC – Parent-Child Communication Component Composition in LWC Parent-Child Communication — @api, Custom Events & Complete Guide with Examples Learn how to build composable Lightning Web Components by passing data from parent to child using @api properties, and communicating back from child to parent using custom events — the two core pillars of LWC component composition. 1 What is Component Composition? Component composition is the pattern of building complex UIs by nesting smaller, focused components inside each other. In LWC, a parent component owns and controls the overall page or feature, while child components handle specific, reusable pieces of UI. This approach follows the single responsibility principle — each component does one thing well, and parent components wire them together. 🏠 Parent Component owns state, coordinates children ...
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LWC

Slots in LWC – Default & Named Slots

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Slots in LWC – Default & Named Slots Slots in LWC Default & Named Slots — Complete Guide with Examples Learn how to use default slots and named slots in Lightning Web Components to build flexible, reusable child components that accept dynamic content from parent components — a core pattern for composable LWC architecture. 1 Introduction to Slots A slot is a placeholder inside a child component's template that a parent component can fill with its own HTML content. This is the standard Web Components composition model — LWC implements it natively. Think of a slot as a "hole" in a component's template. The child component defines where the hole is; the parent component decides what to put in it. LWC supports two types of slots: • Default slot — A single unnamed slot that catches any content passed without a slot attribute. • Named slot — A slot with a spec...
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LWC

Render Lists in LWC – for:each & iterator Directives

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Render Lists in LWC – for:each & iterator Directives Render Lists in LWC for:each & iterator Directives — Complete Guide with Examples Learn how to use for:each and iterator directives in Lightning Web Components to efficiently render dynamic lists — and understand the key differences, rules, and best practices for each approach. 1 Introduction Rendering lists is one of the most common tasks in any UI framework. In Lightning Web Components (LWC), you have two built-in directives for iterating over arrays in your HTML template: • for:each — The standard directive for looping over an array and rendering a block of HTML for each item. • iterator — An advanced directive that provides extra metadata ( first , last , index , value ) for each item — useful when you need to style the first or last item differently. ⚠️ Important: Both directives require a key attribute on the first child elem...
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