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A0mineTV

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📝 Build a Dynamic Comment Management Interface with Svelte

#svelte #frontend #tutorial

In this article, we’ll explore how to create a dynamic and interactive interface to manage comments and replies using Svelte. This project demonstrates reusable components, smooth animations, and clean state management practices.

🎯 Project Objective

The goal of this project is to build an interface that allows users to:

  • Add new comments.
  • Edit or delete existing comments.
  • Reply to comments.
  • Handle errors and provide smooth transitions for a better user experience.

📂 File Structure

Here’s the structure of the project files:

src/ ├── App.svelte ├── components/ │ ├── AddComment.svelte │ ├── Comments.svelte │ ├── CommentReply.svelte │ ├── MessageError.svelte

🔧 Implementation

1️⃣ Main Component: App.svelte

The App.svelte file manages the central state of the application and orchestrates the interactions between components. Here's a simplified version:

<script> import Header from "./components/Header.svelte"; import Comments from "./components/Comments.svelte"; import AddComment from "./components/AddComment.svelte"; import MessageError from "./components/MessageError.svelte"; let activeFormComment = false; let comments = []; let error = false; function handleAddComment(e) { const { username, content } = e.detail; if (!username || !content) { error = true; return; } comments = [...comments, { id: comments.length + 1, username, content, reply: [] }]; error = false; activeFormComment = false; } function handleRemoveComment(e) { const { commentID } = e.detail; comments = comments.filter((c) => c.id !== commentID); } </script> <Header /> <div class="container"> <h1>Comment Management</h1> {#if error} <MessageError message="Please fill out all fields before submitting." /> {/if} <Comments comments={comments} on:removeComment={handleRemoveComment} /> <AddComment active={activeFormComment} on:submit={handleAddComment} /> </div> --- ### 2️⃣ Add New Comment: AddComment.svelte This component handles adding new comments with transitions.
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import { createEventDispatcher } from "svelte"; export let active = false; export let reply = false; let username = ""; let content = ""; const dispatch = createEventDispatcher(); function onSubmit() { if (!username || !content) { alert("Please fill in all fields."); return; } dispatch("submit", { username, content }); username = ""; content = ""; }
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{#if active}



Username



Content


Submit

{/if}
 --- ### 3️⃣ List of Comments: `Comments.svelte` This component displays the list of comments and their replies.
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import { createEventDispatcher } from "svelte"; import CommentReply from "./CommentReply.svelte"; export let comments = []; const dispatch = createEventDispatcher(); function removeComment(commentID) { dispatch("removeComment", { commentID }); }
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{#each comments as comment}


{comment.username}: {comment.content}


removeComment(comment.id)}>Delete
{#each comment.reply as reply}

{/each}

{/each}
 ### 4️⃣ Replies: `CommentReply.svelte` This component handles the display of replies to comments.
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export let comment; <p><strong>{comment.username}</strong>: {comment.content}</p>
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 --- 5️⃣ Error Handling: `MessageError.svelte` This component displays error messages.
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export let message = "An error occurred.";
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{message}

 --- ## 🎨 Final Result With this project, you’ll have an intuitive interface where users can: - Add, edit, delete, or reply to comments. - See error messages dynamically when required fields are missing. - Enjoy smooth animations and transitions during interactions. This interface is lightweight, responsive, and easy to extend, making it a great base for more complex applications or features like comment sorting, pagination, or user authentication. Here’s a summary of what we’ve built: 1. **Dynamic Comment Management:** Easily manage a list of comments with options to edit, delete, or reply. 2. **Error Feedback:** Inform users about missing fields with a reusable error message component. 3. **Interactive Transitions:** Use Svelte's built-in transitions for a modern and polished user experience. Feel free to extend this project further by adding: - **Server Integration:** Connect it to a backend API to persist comments. - **Authentication:** Restrict certain actions like editing or deleting to authenticated users. - **Advanced Features:** Add pagination or filtering for comments in large datasets. Let your creativity guide you ! --- ### 🚀 Conclusion This project showcases how `Svelte `can help you build dynamic and interactive UIs with simplicity and efficiency. Features like built-in animations and state management make Svelte an excellent choice for modern web applications.
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