Tutorials covering Vue.js from fundamentals through advanced patterns. Each chapter follows a consistent structure: intro prose, key point callout, motivation section, detailed walkthroughs with code, a complete example session, quick reference tables, best practices, common pitfalls, real-world examples, ASCII diagrams, and a summary. Topics include template syntax, attribute binding, event handling, conditional and list rendering, computed properties, watchers, component communication, slots, the Composition API, reactivity internals, lifecycle hooks, and ecosystem tooling like Vite, Vue Router, and Pinia. Every chapter uses real, verifiable code with no invented data, and each builds on the previous without cross-contaminating other framework series.
v-model is Vue’s two-way binding directive, and on the surface it looks like magic: a single attribute synchronizes a form input with a reactive variable. Under the hood, it is a compile-time transformation that expands into a prop binding and an event listener. On a native <input>, v-model=”text” becomes :value=”text” plus @input=”text = $event.target.value”. On…
Custom directives are Vue’s escape hatch for low-level DOM manipulation. They exist for the cases that components and composables cannot cover: focusing an input when it appears, integrating a third-party DOM library that expects a raw element, or attaching an event listener that must be cleaned up on unmount. The directive is defined as an…
Form validation in Vue 3 is not a built-in feature. The framework gives you reactivity and v-model, but the rules, the error state, the submission gating, and the async validation are left to the application. VeeValidate is the library that fills this gap. It is not a schema validator itself—it is the form state manager…
Form accessibility is not a feature that can be added after the form works. It is a set of constraints that must shape the markup from the first line: every input needs a programmatically associated label, every error needs to be announced to a screen reader, every interactive element needs to be reachable by keyboard,…
Vue’s transition system is not a separate animation library. It is a set of built-in components that wrap the DOM insertion and removal operations that Vue already performs, and apply CSS classes or JavaScript hooks at precise moments during those operations. The <Transition> component handles a single element or component. The <TransitionGroup> component handles a…
Vue’s <Transition> component is a timing coordinator, not an animation library. It does not define how an element should fade, slide, or bounce—it defines when the classes or hooks that do those things are applied. The component wraps a single element or component, watches for its insertion or removal, and at precise moments adds and…
Vue’s core runtime is platform-agnostic. The DOM-specific parts—document.createElement, element.setAttribute, element.appendChild—live in a separate package, @vue/runtime-dom, which is itself built on the same createRenderer API that is exposed to application developers . This means the component model, the reactivity system, the virtual DOM diffing, and the lifecycle hooks are not tied to the browser. They are…
Vue components and native Web Components are two different component models that solve overlapping problems. Vue’s component model is framework-specific: a Vue component is a plain object or function that the Vue runtime knows how to mount and update. A Web Component is a browser primitive: a class that extends HTMLElement and is registered with…
A Vue component is a black box from the outside. It receives props, renders output, and emits events. The test should assert on those three things—what goes in, what comes out, and what the user sees—rather than on the internal refs, computed properties, or methods. Vue Test Utils is the library that mounts the component…
A Vue component does not exist in isolation. It reads from a Pinia store, navigates with Vue Router, and fetches data asynchronously. A test that mounts the component without providing these dependencies fails with an injection error, a missing $router, or an assertion that runs before the data arrives. The three dependencies require three different…