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  • Book Overview & Buying Real-World Svelte
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Real-World Svelte

Real-World Svelte

By : Hau
4.5 (17)
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Real-World Svelte

Real-World Svelte

4.5 (17)
By: Hau

Overview of this book

Svelte has quickly become a popular choice among developers seeking to build fast, responsive, and efficient web applications that are high-performing, scalable, and visually stunning. This book goes beyond the basics to help you thoroughly explore the core concepts that make Svelte stand out among other frameworks. You’ll begin by gaining a clear understanding of lifecycle functions, reusable hooks, and various styling options such as Tailwind CSS and CSS variables. Next, you’ll find out how to effectively manage the state, props, and bindings and explore component patterns for better organization. You’ll also discover how to create patterns using actions, demonstrate custom events, integrate vanilla JS UI libraries, and progressively enhance UI elements. As you advance, you’ll delve into state management with context and stores, implement custom stores, handle complex data, and manage states effectively, along with creating renderless components for specialized functionalities and learning animations with tweened and spring stores. The concluding chapters will help you focus on enhancing UI elements with transitions while covering accessibility considerations. By the end of this book, you’ll be equipped to unlock Svelte's full potential, build exceptional web applications, and deliver performant, responsive, and inclusive user experiences.
Table of Contents (22 chapters)
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1
Part 1: Writing Svelte Components
6
Part 2: Actions
10
Part 3: Context and Stores
16
Part 4: Transitions

Example – validating form inputs with custom events

The example that we are going to explore is using actions to validate form inputs.

When you add an input element to your form, you can add attributes such as required, minlength, and min to indicate that the input value has to pass the constraint validation or else would be considered invalid.

However, by default, such a validation check is only done during form submission. There’s no real-time feedback on whether your input is valid as you type.

To make the input element validate as you type, we need to add an 'input' event listener (which will be called on every keystroke as we type in the input element) and call input.checkValidity() to validate the input. Now, let’s do just that:

<input on:input={(event) => event.target.checkValidity()} />

As you call the checkValidity() method, if the input is indeed invalid, then it will trigger the 'invalid' event:

<input...
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Real-World Svelte
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